feat(cors): ✨ add check for server port in CORS config

* Update processInsert to use the primary key name dynamically.
* Ensure correct ID retrieval from data based on primary key.

pkg/common/cors.go

@@ -3,6 +3,8 @@ package common
 import (
 	"fmt"
 	"strings"
+
+	"github.com/bitechdev/ResolveSpec/pkg/config"
 )
 
 // CORSConfig holds CORS configuration
@@ -15,8 +17,30 @@ type CORSConfig struct {
 
 // DefaultCORSConfig returns a default CORS configuration suitable for HeadSpec
 func DefaultCORSConfig() CORSConfig {
+	configManager := config.GetConfigManager()
+	cfg, _ := configManager.GetConfig()
+	hosts := make([]string, 0)
+	// hosts = append(hosts, "*")
+
+	_, _, ipsList := config.GetIPs()
+
+	for i := range cfg.Servers.Instances {
+		server := cfg.Servers.Instances[i]
+		if server.Port == 0 {
+			continue
+		}
+		hosts = append(hosts, server.ExternalURLs...)
+		hosts = append(hosts, fmt.Sprintf("http://%s:%d", server.Host, server.Port))
+		hosts = append(hosts, fmt.Sprintf("https://%s:%d", server.Host, server.Port))
+		hosts = append(hosts, fmt.Sprintf("http://%s:%d", "localhost", server.Port))
+		for _, ip := range ipsList {
+			hosts = append(hosts, fmt.Sprintf("http://%s:%d", ip.String(), server.Port))
+			hosts = append(hosts, fmt.Sprintf("https://%s:%d", ip.String(), server.Port))
+		}
+	}
+
 	return CORSConfig{
-		AllowedOrigins: []string{"*"},
+		AllowedOrigins: hosts,
 		AllowedMethods: []string{"GET", "POST", "PUT", "PATCH", "DELETE", "OPTIONS"},
 		AllowedHeaders: GetHeadSpecHeaders(),
 		MaxAge:         86400, // 24 hours

pkg/common/handler_utils.go

@@ -3,6 +3,9 @@ package common
 import (
 	"fmt"
 	"reflect"
+	"strings"
+
+	"github.com/bitechdev/ResolveSpec/pkg/logger"
 )
 
 // ValidateAndUnwrapModelResult contains the result of model validation
@@ -45,3 +48,216 @@ func ValidateAndUnwrapModel(model interface{}) (*ValidateAndUnwrapModelResult, e
 		OriginalType: originalType,
 	}, nil
 }
+
+// ExtractTagValue extracts the value for a given key from a struct tag string.
+// It handles both semicolon and comma-separated tag formats (e.g., GORM and BUN tags).
+// For tags like "json:name;validate:required" it will extract "name" for key "json".
+// For tags like "rel:has-many,join:table" it will extract "table" for key "join".
+func ExtractTagValue(tag, key string) string {
+	// Split by both semicolons and commas to handle different tag formats
+	// We need to be smart about this - commas can be part of values
+	// So we'll try semicolon first, then comma if needed
+	separators := []string{";", ","}
+
+	for _, sep := range separators {
+		parts := strings.Split(tag, sep)
+		for _, part := range parts {
+			part = strings.TrimSpace(part)
+			if strings.HasPrefix(part, key+":") {
+				return strings.TrimPrefix(part, key+":")
+			}
+		}
+	}
+	return ""
+}
+
+// GetRelationshipInfo analyzes a model type and extracts relationship metadata
+// for a specific relation field identified by its JSON name.
+// Returns nil if the field is not found or is not a valid relationship.
+func GetRelationshipInfo(modelType reflect.Type, relationName string) *RelationshipInfo {
+	// Ensure we have a struct type
+	if modelType == nil || modelType.Kind() != reflect.Struct {
+		logger.Warn("Cannot get relationship info from non-struct type: %v", modelType)
+		return nil
+	}
+
+	for i := 0; i < modelType.NumField(); i++ {
+		field := modelType.Field(i)
+		jsonTag := field.Tag.Get("json")
+		jsonName := strings.Split(jsonTag, ",")[0]
+
+		if jsonName == relationName {
+			gormTag := field.Tag.Get("gorm")
+			bunTag := field.Tag.Get("bun")
+			info := &RelationshipInfo{
+				FieldName: field.Name,
+				JSONName:  jsonName,
+			}
+
+			if strings.Contains(bunTag, "rel:") || strings.Contains(bunTag, "join:") {
+				//bun:"rel:has-many,join:rid_hub=rid_hub_division"
+				if strings.Contains(bunTag, "has-many") {
+					info.RelationType = "hasMany"
+				} else if strings.Contains(bunTag, "has-one") {
+					info.RelationType = "hasOne"
+				} else if strings.Contains(bunTag, "belongs-to") {
+					info.RelationType = "belongsTo"
+				} else if strings.Contains(bunTag, "many-to-many") {
+					info.RelationType = "many2many"
+				} else {
+					info.RelationType = "hasOne"
+				}
+
+				// Extract join info
+				joinPart := ExtractTagValue(bunTag, "join")
+				if joinPart != "" && info.RelationType == "many2many" {
+					// For many2many, the join part is the join table name
+					info.JoinTable = joinPart
+				} else if joinPart != "" {
+					// For other relations, parse foreignKey and references
+					joinParts := strings.Split(joinPart, "=")
+					if len(joinParts) == 2 {
+						info.ForeignKey = joinParts[0]
+						info.References = joinParts[1]
+					}
+				}
+
+				// Get related model type
+				if field.Type.Kind() == reflect.Slice {
+					elemType := field.Type.Elem()
+					if elemType.Kind() == reflect.Ptr {
+						elemType = elemType.Elem()
+					}
+					if elemType.Kind() == reflect.Struct {
+						info.RelatedModel = reflect.New(elemType).Elem().Interface()
+					}
+				} else if field.Type.Kind() == reflect.Ptr || field.Type.Kind() == reflect.Struct {
+					elemType := field.Type
+					if elemType.Kind() == reflect.Ptr {
+						elemType = elemType.Elem()
+					}
+					if elemType.Kind() == reflect.Struct {
+						info.RelatedModel = reflect.New(elemType).Elem().Interface()
+					}
+				}
+
+				return info
+			}
+
+			// Parse GORM tag to determine relationship type and keys
+			if strings.Contains(gormTag, "foreignKey") {
+				info.ForeignKey = ExtractTagValue(gormTag, "foreignKey")
+				info.References = ExtractTagValue(gormTag, "references")
+
+				// Determine if it's belongsTo or hasMany/hasOne
+				if field.Type.Kind() == reflect.Slice {
+					info.RelationType = "hasMany"
+					// Get the element type for slice
+					elemType := field.Type.Elem()
+					if elemType.Kind() == reflect.Ptr {
+						elemType = elemType.Elem()
+					}
+					if elemType.Kind() == reflect.Struct {
+						info.RelatedModel = reflect.New(elemType).Elem().Interface()
+					}
+				} else if field.Type.Kind() == reflect.Ptr || field.Type.Kind() == reflect.Struct {
+					info.RelationType = "belongsTo"
+					elemType := field.Type
+					if elemType.Kind() == reflect.Ptr {
+						elemType = elemType.Elem()
+					}
+					if elemType.Kind() == reflect.Struct {
+						info.RelatedModel = reflect.New(elemType).Elem().Interface()
+					}
+				}
+			} else if strings.Contains(gormTag, "many2many") {
+				info.RelationType = "many2many"
+				info.JoinTable = ExtractTagValue(gormTag, "many2many")
+				// Get the element type for many2many (always slice)
+				if field.Type.Kind() == reflect.Slice {
+					elemType := field.Type.Elem()
+					if elemType.Kind() == reflect.Ptr {
+						elemType = elemType.Elem()
+					}
+					if elemType.Kind() == reflect.Struct {
+						info.RelatedModel = reflect.New(elemType).Elem().Interface()
+					}
+				}
+			} else {
+				// Field has no GORM relationship tags, so it's not a relation
+				return nil
+			}
+
+			return info
+		}
+	}
+	return nil
+}
+
+// RelationPathToBunAlias converts a relation path (e.g., "Order.Customer") to a Bun alias format.
+// It converts to lowercase and replaces dots with double underscores.
+// For example: "Order.Customer" -> "order__customer"
+func RelationPathToBunAlias(relationPath string) string {
+	if relationPath == "" {
+		return ""
+	}
+	// Convert to lowercase and replace dots with double underscores
+	alias := strings.ToLower(relationPath)
+	alias = strings.ReplaceAll(alias, ".", "__")
+	return alias
+}
+
+// ReplaceTableReferencesInSQL replaces references to a base table name in a SQL expression
+// with the appropriate alias for the current preload level.
+// For example, if baseTableName is "mastertaskitem" and targetAlias is "mal__mal",
+// it will replace "mastertaskitem.rid_mastertaskitem" with "mal__mal.rid_mastertaskitem"
+func ReplaceTableReferencesInSQL(sqlExpr, baseTableName, targetAlias string) string {
+	if sqlExpr == "" || baseTableName == "" || targetAlias == "" {
+		return sqlExpr
+	}
+
+	// Replace both quoted and unquoted table references
+	// Handle patterns like: tablename.column, "tablename".column, tablename."column", "tablename"."column"
+
+	// Pattern 1: tablename.column (unquoted)
+	result := strings.ReplaceAll(sqlExpr, baseTableName+".", targetAlias+".")
+
+	// Pattern 2: "tablename".column or "tablename"."column" (quoted table name)
+	result = strings.ReplaceAll(result, "\""+baseTableName+"\".", "\""+targetAlias+"\".")
+
+	return result
+}
+
+// GetTableNameFromModel extracts the table name from a model.
+// It checks the bun tag first, then falls back to converting the struct name to snake_case.
+func GetTableNameFromModel(model interface{}) string {
+	if model == nil {
+		return ""
+	}
+
+	modelType := reflect.TypeOf(model)
+
+	// Unwrap pointers
+	for modelType != nil && modelType.Kind() == reflect.Ptr {
+		modelType = modelType.Elem()
+	}
+
+	if modelType == nil || modelType.Kind() != reflect.Struct {
+		return ""
+	}
+
+	// Look for bun tag on embedded BaseModel
+	for i := 0; i < modelType.NumField(); i++ {
+		field := modelType.Field(i)
+		if field.Anonymous {
+			bunTag := field.Tag.Get("bun")
+			if strings.HasPrefix(bunTag, "table:") {
+				return strings.TrimPrefix(bunTag, "table:")
+			}
+		}
+	}
+
+	// Fallback: convert struct name to lowercase (simple heuristic)
+	// This handles cases like "MasterTaskItem" -> "mastertaskitem"
+	return strings.ToLower(modelType.Name())
+}

pkg/common/handler_utils_test.go

@@ -0,0 +1,108 @@
+package common
+
+import (
+	"testing"
+)
+
+func TestExtractTagValue(t *testing.T) {
+	tests := []struct {
+		name     string
+		tag      string
+		key      string
+		expected string
+	}{
+		{
+			name:     "Extract existing key",
+			tag:      "json:name;validate:required",
+			key:      "json",
+			expected: "name",
+		},
+		{
+			name:     "Extract key with spaces",
+			tag:      "json:name ; validate:required",
+			key:      "validate",
+			expected: "required",
+		},
+		{
+			name:     "Extract key at end",
+			tag:      "json:name;validate:required;db:column_name",
+			key:      "db",
+			expected: "column_name",
+		},
+		{
+			name:     "Extract key at beginning",
+			tag:      "primary:true;json:id;db:user_id",
+			key:      "primary",
+			expected: "true",
+		},
+		{
+			name:     "Key not found",
+			tag:      "json:name;validate:required",
+			key:      "db",
+			expected: "",
+		},
+		{
+			name:     "Empty tag",
+			tag:      "",
+			key:      "json",
+			expected: "",
+		},
+		{
+			name:     "Single key-value pair",
+			tag:      "json:name",
+			key:      "json",
+			expected: "name",
+		},
+		{
+			name:     "Key with empty value",
+			tag:      "json:;validate:required",
+			key:      "json",
+			expected: "",
+		},
+		{
+			name:     "Key with complex value",
+			tag:      "json:user_name,omitempty;validate:required,min=3",
+			key:      "json",
+			expected: "user_name,omitempty",
+		},
+		{
+			name:     "Multiple semicolons",
+			tag:      "json:name;;validate:required",
+			key:      "validate",
+			expected: "required",
+		},
+		{
+			name:     "BUN Tag with comma separator",
+			tag:      "rel:has-many,join:rid_hub=rid_hub_child",
+			key:      "join",
+			expected: "rid_hub=rid_hub_child",
+		},
+		{
+			name:     "Extract foreignKey",
+			tag:      "foreignKey:UserID;references:ID",
+			key:      "foreignKey",
+			expected: "UserID",
+		},
+		{
+			name:     "Extract references",
+			tag:      "foreignKey:UserID;references:ID",
+			key:      "references",
+			expected: "ID",
+		},
+		{
+			name:     "Extract many2many",
+			tag:      "many2many:user_roles",
+			key:      "many2many",
+			expected: "user_roles",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			result := ExtractTagValue(tt.tag, tt.key)
+			if result != tt.expected {
+				t.Errorf("ExtractTagValue(%q, %q) = %q; want %q", tt.tag, tt.key, result, tt.expected)
+			}
+		})
+	}
+}

pkg/common/recursive_crud.go

@@ -20,17 +20,6 @@ type RelationshipInfoProvider interface {
 	GetRelationshipInfo(modelType reflect.Type, relationName string) *RelationshipInfo
 }
 
-// RelationshipInfo contains information about a model relationship
-type RelationshipInfo struct {
-	FieldName    string
-	JSONName     string
-	RelationType string // "belongsTo", "hasMany", "hasOne", "many2many"
-	ForeignKey   string
-	References   string
-	JoinTable    string
-	RelatedModel interface{}
-}
-
 // NestedCUDProcessor handles recursive processing of nested object graphs
 type NestedCUDProcessor struct {
 	db                 Database
@@ -218,9 +207,9 @@ func (p *NestedCUDProcessor) processInsert(
 	for key, value := range data {
 		query = query.Value(key, value)
 	}
-
+	pkName := reflection.GetPrimaryKeyName(tableName)
 	// Add RETURNING clause to get the inserted ID
-	query = query.Returning("id")
+	query = query.Returning(pkName)
 
 	result, err := query.Exec(ctx)
 	if err != nil {
@@ -231,8 +220,8 @@ func (p *NestedCUDProcessor) processInsert(
 	var id interface{}
 	if lastID, err := result.LastInsertId(); err == nil && lastID > 0 {
 		id = lastID
-	} else if data["id"] != nil {
-		id = data["id"]
+	} else if data[pkName] != nil {
+		id = data[pkName]
 	}
 
 	logger.Debug("Insert successful, ID: %v, rows affected: %d", id, result.RowsAffected())

pkg/common/types.go

@@ -111,3 +111,14 @@ type TableMetadata struct {
 	Columns   []Column `json:"columns"`
 	Relations []string `json:"relations"`
 }
+
+// RelationshipInfo contains information about a model relationship
+type RelationshipInfo struct {
+	FieldName    string      `json:"field_name"`
+	JSONName     string      `json:"json_name"`
+	RelationType string      `json:"relation_type"` // "belongsTo", "hasMany", "hasOne", "many2many"
+	ForeignKey   string      `json:"foreign_key"`
+	References   string      `json:"references"`
+	JoinTable    string      `json:"join_table"`
+	RelatedModel interface{} `json:"related_model"`
+}

pkg/config/config.go

@@ -73,6 +73,9 @@ type ServerInstanceConfig struct {
 
 	// Tags for organization and filtering
 	Tags map[string]string `mapstructure:"tags"`
+
+	// ExternalURLs are additional URLs that this server instance is accessible from (for CORS) for proxy setups
+	ExternalURLs []string `mapstructure:"external_urls"`
 }
 
 // TracingConfig holds OpenTelemetry tracing configuration

pkg/config/manager.go

@@ -12,6 +12,16 @@ type Manager struct {
 	v *viper.Viper
 }
 
+var configInstance *Manager
+
+// GetConfigManager returns a singleton configuration manager instance
+func GetConfigManager() *Manager {
+	if configInstance == nil {
+		configInstance = NewManager()
+	}
+	return configInstance
+}
+
 // NewManager creates a new configuration manager with defaults
 func NewManager() *Manager {
 	v := viper.New()
@@ -32,7 +42,8 @@ func NewManager() *Manager {
 	// Set default values
 	setDefaults(v)
 
-	return &Manager{v: v}
+	configInstance = &Manager{v: v}
+	return configInstance
 }
 
 // NewManagerWithOptions creates a new configuration manager with custom options

pkg/config/server.go

@@ -2,6 +2,9 @@ package config
 
 import (
 	"fmt"
+	"net"
+	"os"
+	"strings"
 )
 
 // ApplyGlobalDefaults applies global server defaults to this instance
@@ -105,3 +108,42 @@ func (sc *ServersConfig) GetDefault() (*ServerInstanceConfig, error) {
 
 	return &instance, nil
 }
+
+// GetIPs - GetIP for pc
+func GetIPs() (hostname string, ipList string, ipNetList []net.IP) {
+	defer func() {
+		if err := recover(); err != nil {
+			fmt.Println("Recovered in GetIPs", err)
+		}
+	}()
+	hostname, _ = os.Hostname()
+	ipaddrlist := make([]net.IP, 0)
+	iplist := ""
+	addrs, err := net.LookupIP(hostname)
+	if err != nil {
+		return hostname, iplist, ipaddrlist
+	}
+
+	for _, a := range addrs {
+		// cfg.LogInfo("\nFound IP Host Address: %s", a)
+		if strings.Contains(a.String(), "127.0.0.1") {
+			continue
+		}
+		iplist = fmt.Sprintf("%s,%s", iplist, a)
+		ipaddrlist = append(ipaddrlist, a)
+	}
+	if iplist == "" {
+		iff, _ := net.InterfaceAddrs()
+		for _, a := range iff {
+			// cfg.LogInfo("\nFound IP Address: %s", a)
+			if strings.Contains(a.String(), "127.0.0.1") {
+				continue
+			}
+			iplist = fmt.Sprintf("%s,%s", iplist, a)
+
+		}
+
+	}
+	iplist = strings.TrimLeft(iplist, ",")
+	return hostname, iplist, ipaddrlist
+}

pkg/funcspec/function_api.go

@@ -12,6 +12,8 @@ import (
 	"strings"
 	"time"
 
+	"github.com/google/uuid"
+
 	"github.com/bitechdev/ResolveSpec/pkg/common"
 	"github.com/bitechdev/ResolveSpec/pkg/logger"
 	"github.com/bitechdev/ResolveSpec/pkg/restheadspec"
@@ -123,27 +125,6 @@ func (h *Handler) SqlQueryList(sqlquery string, options SqlQueryOptions) HTTPFun
 			ComplexAPI:  complexAPI,
 		}
 
-		// Execute BeforeQueryList hook
-		if err := h.hooks.Execute(BeforeQueryList, hookCtx); err != nil {
-			logger.Error("BeforeQueryList hook failed: %v", err)
-			sendError(w, http.StatusBadRequest, "hook_error", "Hook execution failed", err)
-			return
-		}
-
-		// Check if hook aborted the operation
-		if hookCtx.Abort {
-			if hookCtx.AbortCode == 0 {
-				hookCtx.AbortCode = http.StatusBadRequest
-			}
-			sendError(w, hookCtx.AbortCode, "operation_aborted", hookCtx.AbortMessage, nil)
-			return
-		}
-
-		// Use potentially modified SQL query and variables from hooks
-		sqlquery = hookCtx.SQLQuery
-		variables = hookCtx.Variables
-		// complexAPI = hookCtx.ComplexAPI
-
 		// Extract input variables from SQL query (placeholders like [variable])
 		sqlquery = h.extractInputVariables(sqlquery, &inputvars)
 
@@ -203,6 +184,27 @@ func (h *Handler) SqlQueryList(sqlquery string, options SqlQueryOptions) HTTPFun
 
 		// Execute query within transaction
 		err := h.db.RunInTransaction(ctx, func(tx common.Database) error {
+			// Set transaction in hook context for hooks to use
+			hookCtx.Tx = tx
+
+			// Execute BeforeQueryList hook (inside transaction)
+			if err := h.hooks.Execute(BeforeQueryList, hookCtx); err != nil {
+				logger.Error("BeforeQueryList hook failed: %v", err)
+				sendError(w, http.StatusBadRequest, "hook_error", "Hook execution failed", err)
+				return err
+			}
+
+			// Check if hook aborted the operation
+			if hookCtx.Abort {
+				if hookCtx.AbortCode == 0 {
+					hookCtx.AbortCode = http.StatusBadRequest
+				}
+				sendError(w, hookCtx.AbortCode, "operation_aborted", hookCtx.AbortMessage, nil)
+				return fmt.Errorf("operation aborted: %s", hookCtx.AbortMessage)
+			}
+
+			// Use potentially modified SQL query from hook
+			sqlquery = hookCtx.SQLQuery
 			sqlqueryCnt := sqlquery
 
 			// Parse sorting and pagination parameters
@@ -286,6 +288,21 @@ func (h *Handler) SqlQueryList(sqlquery string, options SqlQueryOptions) HTTPFun
 			}
 			total = hookCtx.Total
 
+			// Execute AfterQueryList hook (inside transaction)
+			hookCtx.Result = dbobjlist
+			hookCtx.Total = total
+			hookCtx.Error = nil
+			if err := h.hooks.Execute(AfterQueryList, hookCtx); err != nil {
+				logger.Error("AfterQueryList hook failed: %v", err)
+				sendError(w, http.StatusInternalServerError, "hook_error", "Hook execution failed", err)
+				return err
+			}
+			// Use potentially modified result from hook
+			if modifiedResult, ok := hookCtx.Result.([]map[string]interface{}); ok {
+				dbobjlist = modifiedResult
+			}
+			total = hookCtx.Total
+
 			return nil
 		})
 
@@ -294,21 +311,6 @@ func (h *Handler) SqlQueryList(sqlquery string, options SqlQueryOptions) HTTPFun
 			return
 		}
 
-		// Execute AfterQueryList hook
-		hookCtx.Result = dbobjlist
-		hookCtx.Total = total
-		hookCtx.Error = err
-		if err := h.hooks.Execute(AfterQueryList, hookCtx); err != nil {
-			logger.Error("AfterQueryList hook failed: %v", err)
-			sendError(w, http.StatusInternalServerError, "hook_error", "Hook execution failed", err)
-			return
-		}
-		// Use potentially modified result from hook
-		if modifiedResult, ok := hookCtx.Result.([]map[string]interface{}); ok {
-			dbobjlist = modifiedResult
-		}
-		total = hookCtx.Total
-
 		// Set response headers
 		respOffset := 0
 		if offsetStr := r.URL.Query().Get("offset"); offsetStr != "" {
@@ -459,26 +461,6 @@ func (h *Handler) SqlQuery(sqlquery string, options SqlQueryOptions) HTTPFuncTyp
 			ComplexAPI:  complexAPI,
 		}
 
-		// Execute BeforeQuery hook
-		if err := h.hooks.Execute(BeforeQuery, hookCtx); err != nil {
-			logger.Error("BeforeQuery hook failed: %v", err)
-			sendError(w, http.StatusBadRequest, "hook_error", "Hook execution failed", err)
-			return
-		}
-
-		// Check if hook aborted the operation
-		if hookCtx.Abort {
-			if hookCtx.AbortCode == 0 {
-				hookCtx.AbortCode = http.StatusBadRequest
-			}
-			sendError(w, hookCtx.AbortCode, "operation_aborted", hookCtx.AbortMessage, nil)
-			return
-		}
-
-		// Use potentially modified SQL query and variables from hooks
-		sqlquery = hookCtx.SQLQuery
-		variables = hookCtx.Variables
-
 		// Extract input variables from SQL query
 		sqlquery = h.extractInputVariables(sqlquery, &inputvars)
 
@@ -554,6 +536,28 @@ func (h *Handler) SqlQuery(sqlquery string, options SqlQueryOptions) HTTPFuncTyp
 
 		// Execute query within transaction
 		err := h.db.RunInTransaction(ctx, func(tx common.Database) error {
+			// Set transaction in hook context for hooks to use
+			hookCtx.Tx = tx
+
+			// Execute BeforeQuery hook (inside transaction)
+			if err := h.hooks.Execute(BeforeQuery, hookCtx); err != nil {
+				logger.Error("BeforeQuery hook failed: %v", err)
+				sendError(w, http.StatusBadRequest, "hook_error", "Hook execution failed", err)
+				return err
+			}
+
+			// Check if hook aborted the operation
+			if hookCtx.Abort {
+				if hookCtx.AbortCode == 0 {
+					hookCtx.AbortCode = http.StatusBadRequest
+				}
+				sendError(w, hookCtx.AbortCode, "operation_aborted", hookCtx.AbortMessage, nil)
+				return fmt.Errorf("operation aborted: %s", hookCtx.AbortMessage)
+			}
+
+			// Use potentially modified SQL query from hook
+			sqlquery = hookCtx.SQLQuery
+
 			// Execute BeforeSQLExec hook
 			if err := h.hooks.Execute(BeforeSQLExec, hookCtx); err != nil {
 				logger.Error("BeforeSQLExec hook failed: %v", err)
@@ -586,6 +590,19 @@ func (h *Handler) SqlQuery(sqlquery string, options SqlQueryOptions) HTTPFuncTyp
 				dbobj = modifiedResult
 			}
 
+			// Execute AfterQuery hook (inside transaction)
+			hookCtx.Result = dbobj
+			hookCtx.Error = nil
+			if err := h.hooks.Execute(AfterQuery, hookCtx); err != nil {
+				logger.Error("AfterQuery hook failed: %v", err)
+				sendError(w, http.StatusInternalServerError, "hook_error", "Hook execution failed", err)
+				return err
+			}
+			// Use potentially modified result from hook
+			if modifiedResult, ok := hookCtx.Result.(map[string]interface{}); ok {
+				dbobj = modifiedResult
+			}
+
 			return nil
 		})
 
@@ -594,19 +611,6 @@ func (h *Handler) SqlQuery(sqlquery string, options SqlQueryOptions) HTTPFuncTyp
 			return
 		}
 
-		// Execute AfterQuery hook
-		hookCtx.Result = dbobj
-		hookCtx.Error = err
-		if err := h.hooks.Execute(AfterQuery, hookCtx); err != nil {
-			logger.Error("AfterQuery hook failed: %v", err)
-			sendError(w, http.StatusInternalServerError, "hook_error", "Hook execution failed", err)
-			return
-		}
-		// Use potentially modified result from hook
-		if modifiedResult, ok := hookCtx.Result.(map[string]interface{}); ok {
-			dbobj = modifiedResult
-		}
-
 		// Execute BeforeResponse hook
 		hookCtx.Result = dbobj
 		if err := h.hooks.Execute(BeforeResponse, hookCtx); err != nil {
@@ -1097,9 +1101,25 @@ func normalizePostgresValue(value interface{}) interface{} {
 	case map[string]interface{}:
 		// Recursively normalize nested maps
 		return normalizePostgresTypes(v)
-
+	case string:
+		var jsonObj interface{}
+		if err := json.Unmarshal([]byte(v), &jsonObj); err == nil {
+			// It's valid JSON, return as json.RawMessage so it's not double-encoded
+			return json.RawMessage(v)
+		}
+		return v
+	case uuid.UUID:
+		return v.String()
+	case time.Time:
+		return v.Format(time.RFC3339)
+	case bool, int, int8, int16, int32, int64, float32, float64, uint, uint8, uint16, uint32, uint64:
+		return v
 	default:
-		// For other types (int, float, string, bool, etc.), return as-is
+		// For other types (int, float, bool, etc.), return as-is
+		// Check stringers
+		if str, ok := v.(fmt.Stringer); ok {
+			return str.String()
+		}
 		return v
 	}
 }

pkg/funcspec/hooks.go

@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"net/http"
 
+	"github.com/bitechdev/ResolveSpec/pkg/common"
 	"github.com/bitechdev/ResolveSpec/pkg/logger"
 	"github.com/bitechdev/ResolveSpec/pkg/security"
 )
@@ -46,6 +47,10 @@ type HookContext struct {
 	// User context
 	UserContext *security.UserContext
 
+	// Tx provides access to the database/transaction for executing additional SQL
+	// This allows hooks to run custom queries in addition to the main Query chain
+	Tx common.Database
+
 	// Pagination and filtering (for list queries)
 	SortColumns string
 	Limit       int

pkg/reflection/helpers.go

@@ -47,3 +47,20 @@ func ExtractTableNameOnly(fullName string) string {
 
 	return fullName[startIndex:]
 }
+
+// GetPointerElement returns the element type if the provided reflect.Type is a pointer.
+// If the type is a slice of pointers, it returns the element type of the pointer within the slice.
+// If neither condition is met, it returns the original type.
+func GetPointerElement(v reflect.Type) reflect.Type {
+	if v.Kind() == reflect.Ptr {
+		return v.Elem()
+	}
+	if v.Kind() == reflect.Slice && v.Elem().Kind() == reflect.Ptr {
+		subElem := v.Elem()
+		if subElem.Elem().Kind() == reflect.Ptr {
+			return subElem.Elem().Elem()
+		}
+		return v.Elem()
+	}
+	return v
+}

pkg/reflection/model_utils.go

@@ -584,11 +584,23 @@ func ExtractSourceColumn(colName string) string {
 }
 
 // ToSnakeCase converts a string from CamelCase to snake_case
+// Handles consecutive uppercase letters (acronyms) correctly:
+// "HTTPServer" -> "http_server", "UserID" -> "user_id", "MyHTTPServer" -> "my_http_server"
 func ToSnakeCase(s string) string {
 	var result strings.Builder
-	for i, r := range s {
+	runes := []rune(s)
+
+	for i, r := range runes {
 		if i > 0 && r >= 'A' && r <= 'Z' {
-			result.WriteRune('_')
+			// Add underscore if:
+			// 1. Previous character is lowercase, OR
+			// 2. Next character is lowercase (transition from acronym to word)
+			prevIsLower := runes[i-1] >= 'a' && runes[i-1] <= 'z'
+			nextIsLower := i+1 < len(runes) && runes[i+1] >= 'a' && runes[i+1] <= 'z'
+
+			if prevIsLower || nextIsLower {
+				result.WriteRune('_')
+			}
 		}
 		result.WriteRune(r)
 	}
@@ -961,7 +973,7 @@ func MapToStruct(dataMap map[string]interface{}, target interface{}) error {
 		// 4. Field name variations
 		columnNames = append(columnNames, field.Name)
 		columnNames = append(columnNames, strings.ToLower(field.Name))
-		columnNames = append(columnNames, ToSnakeCase(field.Name))
+		// columnNames = append(columnNames, ToSnakeCase(field.Name))
 
 		// Map all column name variations to this field index
 		for _, colName := range columnNames {
@@ -1067,7 +1079,7 @@ func setFieldValue(field reflect.Value, value interface{}) error {
 			case string:
 				field.SetBytes([]byte(v))
 				return nil
-			case map[string]interface{}, []interface{}:
+			case map[string]interface{}, []interface{}, []*any, map[string]*any:
 				// Marshal complex types to JSON for SqlJSONB fields
 				jsonBytes, err := json.Marshal(v)
 				if err != nil {
@@ -1077,6 +1089,11 @@ func setFieldValue(field reflect.Value, value interface{}) error {
 				return nil
 			}
 		}
+
+		// Handle slice-to-slice conversions (e.g., []interface{} to []*SomeModel)
+		if valueReflect.Kind() == reflect.Slice {
+			return convertSlice(field, valueReflect)
+		}
 	}
 
 	// Handle struct types (like SqlTimeStamp, SqlDate, SqlTime which wrap SqlNull[time.Time])
@@ -1156,6 +1173,92 @@ func setFieldValue(field reflect.Value, value interface{}) error {
 	return fmt.Errorf("cannot convert %v to %v", valueReflect.Type(), field.Type())
 }
 
+// convertSlice converts a source slice to a target slice type, handling element-wise conversions
+// Supports converting []interface{} to slices of structs or pointers to structs
+func convertSlice(targetSlice reflect.Value, sourceSlice reflect.Value) error {
+	if sourceSlice.Kind() != reflect.Slice || targetSlice.Kind() != reflect.Slice {
+		return fmt.Errorf("both source and target must be slices")
+	}
+
+	// Get the element type of the target slice
+	targetElemType := targetSlice.Type().Elem()
+	sourceLen := sourceSlice.Len()
+
+	// Create a new slice with the same length as the source
+	newSlice := reflect.MakeSlice(targetSlice.Type(), sourceLen, sourceLen)
+
+	// Convert each element
+	for i := 0; i < sourceLen; i++ {
+		sourceElem := sourceSlice.Index(i)
+		targetElem := newSlice.Index(i)
+
+		// Get the actual value from the source element
+		var sourceValue interface{}
+		if sourceElem.CanInterface() {
+			sourceValue = sourceElem.Interface()
+		} else {
+			continue
+		}
+
+		// Handle nil elements
+		if sourceValue == nil {
+			// For pointer types, nil is valid
+			if targetElemType.Kind() == reflect.Ptr {
+				targetElem.Set(reflect.Zero(targetElemType))
+			}
+			continue
+		}
+
+		// If target element type is a pointer to struct, we need to create new instances
+		if targetElemType.Kind() == reflect.Ptr {
+			// Create a new instance of the pointed-to type
+			newElemPtr := reflect.New(targetElemType.Elem())
+
+			// Convert the source value to the struct
+			switch sv := sourceValue.(type) {
+			case map[string]interface{}:
+				// Source is a map, use MapToStruct to populate the new instance
+				if err := MapToStruct(sv, newElemPtr.Interface()); err != nil {
+					return fmt.Errorf("failed to convert element %d: %w", i, err)
+				}
+			default:
+				// Try direct conversion or setFieldValue
+				if err := setFieldValue(newElemPtr.Elem(), sourceValue); err != nil {
+					return fmt.Errorf("failed to convert element %d: %w", i, err)
+				}
+			}
+
+			targetElem.Set(newElemPtr)
+		} else if targetElemType.Kind() == reflect.Struct {
+			// Target element is a struct (not a pointer)
+			switch sv := sourceValue.(type) {
+			case map[string]interface{}:
+				// Use MapToStruct to populate the element
+				elemPtr := targetElem.Addr()
+				if elemPtr.CanInterface() {
+					if err := MapToStruct(sv, elemPtr.Interface()); err != nil {
+						return fmt.Errorf("failed to convert element %d: %w", i, err)
+					}
+				}
+			default:
+				// Try direct conversion
+				if err := setFieldValue(targetElem, sourceValue); err != nil {
+					return fmt.Errorf("failed to convert element %d: %w", i, err)
+				}
+			}
+		} else {
+			// For other types, use setFieldValue
+			if err := setFieldValue(targetElem, sourceValue); err != nil {
+				return fmt.Errorf("failed to convert element %d: %w", i, err)
+			}
+		}
+	}
+
+	// Set the converted slice to the target field
+	targetSlice.Set(newSlice)
+	return nil
+}
+
 // convertToInt64 attempts to convert various types to int64
 func convertToInt64(value interface{}) (int64, bool) {
 	switch v := value.(type) {

pkg/resolvespec/handler.go

@@ -698,20 +698,83 @@ func (h *Handler) handleUpdate(ctx context.Context, w common.ResponseWriter, url
 		}
 
 		// Standard processing without nested relations
-		query := h.db.NewUpdate().Table(tableName).SetMap(updates)
+		// Get the primary key name
+		pkName := reflection.GetPrimaryKeyName(model)
 
-		// Apply conditions
+		// First, read the existing record from the database
+		existingRecord := reflect.New(reflection.GetPointerElement(reflect.TypeOf(model))).Interface()
+		selectQuery := h.db.NewSelect().Model(existingRecord)
+
+		// Apply conditions to select
 		if urlID != "" {
 			logger.Debug("Updating by URL ID: %s", urlID)
-			query = query.Where(fmt.Sprintf("%s = ?", common.QuoteIdent(reflection.GetPrimaryKeyName(model))), urlID)
+			selectQuery = selectQuery.Where(fmt.Sprintf("%s = ?", common.QuoteIdent(pkName)), urlID)
 		} else if reqID != nil {
 			switch id := reqID.(type) {
 			case string:
 				logger.Debug("Updating by request ID: %s", id)
-				query = query.Where(fmt.Sprintf("%s = ?", common.QuoteIdent(reflection.GetPrimaryKeyName(model))), id)
+				selectQuery = selectQuery.Where(fmt.Sprintf("%s = ?", common.QuoteIdent(pkName)), id)
 			case []string:
-				logger.Debug("Updating by multiple IDs: %v", id)
-				query = query.Where(fmt.Sprintf("%s IN (?)", common.QuoteIdent(reflection.GetPrimaryKeyName(model))), id)
+				if len(id) > 0 {
+					logger.Debug("Updating by multiple IDs: %v", id)
+					selectQuery = selectQuery.Where(fmt.Sprintf("%s IN (?)", common.QuoteIdent(pkName)), id)
+				}
+			}
+		}
+
+		if err := selectQuery.ScanModel(ctx); err != nil {
+			if err == sql.ErrNoRows {
+				logger.Warn("No records found to update")
+				h.sendError(w, http.StatusNotFound, "not_found", "No records found to update", nil)
+				return
+			}
+			logger.Error("Error fetching existing record: %v", err)
+			h.sendError(w, http.StatusInternalServerError, "update_error", "Error fetching existing record", err)
+			return
+		}
+
+		// Convert existing record to map
+		existingMap := make(map[string]interface{})
+		jsonData, err := json.Marshal(existingRecord)
+		if err != nil {
+			logger.Error("Error marshaling existing record: %v", err)
+			h.sendError(w, http.StatusInternalServerError, "update_error", "Error processing existing record", err)
+			return
+		}
+		if err := json.Unmarshal(jsonData, &existingMap); err != nil {
+			logger.Error("Error unmarshaling existing record: %v", err)
+			h.sendError(w, http.StatusInternalServerError, "update_error", "Error processing existing record", err)
+			return
+		}
+
+		// Merge only non-null and non-empty values from the incoming request into the existing record
+		for key, newValue := range updates {
+			// Skip if the value is nil
+			if newValue == nil {
+				continue
+			}
+
+			// Skip if the value is an empty string
+			if strVal, ok := newValue.(string); ok && strVal == "" {
+				continue
+			}
+
+			// Update the existing map with the new value
+			existingMap[key] = newValue
+		}
+
+		// Build update query with merged data
+		query := h.db.NewUpdate().Table(tableName).SetMap(existingMap)
+
+		// Apply conditions
+		if urlID != "" {
+			query = query.Where(fmt.Sprintf("%s = ?", common.QuoteIdent(pkName)), urlID)
+		} else if reqID != nil {
+			switch id := reqID.(type) {
+			case string:
+				query = query.Where(fmt.Sprintf("%s = ?", common.QuoteIdent(pkName)), id)
+			case []string:
+				query = query.Where(fmt.Sprintf("%s IN (?)", common.QuoteIdent(pkName)), id)
 			}
 		}
 
@@ -782,11 +845,42 @@ func (h *Handler) handleUpdate(ctx context.Context, w common.ResponseWriter, url
 		}
 
 		// Standard batch update without nested relations
+		pkName := reflection.GetPrimaryKeyName(model)
 		err := h.db.RunInTransaction(ctx, func(tx common.Database) error {
 			for _, item := range updates {
 				if itemID, ok := item["id"]; ok {
+					// First, read the existing record
+					existingRecord := reflect.New(reflection.GetPointerElement(reflect.TypeOf(model))).Interface()
+					selectQuery := tx.NewSelect().Model(existingRecord).Where(fmt.Sprintf("%s = ?", common.QuoteIdent(pkName)), itemID)
+					if err := selectQuery.ScanModel(ctx); err != nil {
+						if err == sql.ErrNoRows {
+							continue // Skip if record not found
+						}
+						return fmt.Errorf("failed to fetch existing record: %w", err)
+					}
 
-					txQuery := tx.NewUpdate().Table(tableName).SetMap(item).Where(fmt.Sprintf("%s = ?", common.QuoteIdent(reflection.GetPrimaryKeyName(model))), itemID)
+					// Convert existing record to map
+					existingMap := make(map[string]interface{})
+					jsonData, err := json.Marshal(existingRecord)
+					if err != nil {
+						return fmt.Errorf("failed to marshal existing record: %w", err)
+					}
+					if err := json.Unmarshal(jsonData, &existingMap); err != nil {
+						return fmt.Errorf("failed to unmarshal existing record: %w", err)
+					}
+
+					// Merge only non-null and non-empty values
+					for key, newValue := range item {
+						if newValue == nil {
+							continue
+						}
+						if strVal, ok := newValue.(string); ok && strVal == "" {
+							continue
+						}
+						existingMap[key] = newValue
+					}
+
+					txQuery := tx.NewUpdate().Table(tableName).SetMap(existingMap).Where(fmt.Sprintf("%s = ?", common.QuoteIdent(pkName)), itemID)
 					if _, err := txQuery.Exec(ctx); err != nil {
 						return err
 					}
@@ -857,13 +951,44 @@ func (h *Handler) handleUpdate(ctx context.Context, w common.ResponseWriter, url
 		}
 
 		// Standard batch update without nested relations
+		pkName := reflection.GetPrimaryKeyName(model)
 		list := make([]interface{}, 0)
 		err := h.db.RunInTransaction(ctx, func(tx common.Database) error {
 			for _, item := range updates {
 				if itemMap, ok := item.(map[string]interface{}); ok {
 					if itemID, ok := itemMap["id"]; ok {
+						// First, read the existing record
+						existingRecord := reflect.New(reflection.GetPointerElement(reflect.TypeOf(model))).Interface()
+						selectQuery := tx.NewSelect().Model(existingRecord).Where(fmt.Sprintf("%s = ?", common.QuoteIdent(pkName)), itemID)
+						if err := selectQuery.ScanModel(ctx); err != nil {
+							if err == sql.ErrNoRows {
+								continue // Skip if record not found
+							}
+							return fmt.Errorf("failed to fetch existing record: %w", err)
+						}
 
-						txQuery := tx.NewUpdate().Table(tableName).SetMap(itemMap).Where(fmt.Sprintf("%s = ?", common.QuoteIdent(reflection.GetPrimaryKeyName(model))), itemID)
+						// Convert existing record to map
+						existingMap := make(map[string]interface{})
+						jsonData, err := json.Marshal(existingRecord)
+						if err != nil {
+							return fmt.Errorf("failed to marshal existing record: %w", err)
+						}
+						if err := json.Unmarshal(jsonData, &existingMap); err != nil {
+							return fmt.Errorf("failed to unmarshal existing record: %w", err)
+						}
+
+						// Merge only non-null and non-empty values
+						for key, newValue := range itemMap {
+							if newValue == nil {
+								continue
+							}
+							if strVal, ok := newValue.(string); ok && strVal == "" {
+								continue
+							}
+							existingMap[key] = newValue
+						}
+
+						txQuery := tx.NewUpdate().Table(tableName).SetMap(existingMap).Where(fmt.Sprintf("%s = ?", common.QuoteIdent(pkName)), itemID)
 						if _, err := txQuery.Exec(ctx); err != nil {
 							return err
 						}
@@ -1328,30 +1453,7 @@ func isNullable(field reflect.StructField) bool {
 
 // GetRelationshipInfo implements common.RelationshipInfoProvider interface
 func (h *Handler) GetRelationshipInfo(modelType reflect.Type, relationName string) *common.RelationshipInfo {
-	info := h.getRelationshipInfo(modelType, relationName)
-	if info == nil {
-		return nil
-	}
-	// Convert internal type to common type
-	return &common.RelationshipInfo{
-		FieldName:    info.fieldName,
-		JSONName:     info.jsonName,
-		RelationType: info.relationType,
-		ForeignKey:   info.foreignKey,
-		References:   info.references,
-		JoinTable:    info.joinTable,
-		RelatedModel: info.relatedModel,
-	}
-}
-
-type relationshipInfo struct {
-	fieldName    string
-	jsonName     string
-	relationType string // "belongsTo", "hasMany", "hasOne", "many2many"
-	foreignKey   string
-	references   string
-	joinTable    string
-	relatedModel interface{}
+	return common.GetRelationshipInfo(modelType, relationName)
 }
 
 func (h *Handler) applyPreloads(model interface{}, query common.SelectQuery, preloads []common.PreloadOption) (common.SelectQuery, error) {
@@ -1371,7 +1473,7 @@ func (h *Handler) applyPreloads(model interface{}, query common.SelectQuery, pre
 	for idx := range preloads {
 		preload := preloads[idx]
 		logger.Debug("Processing preload for relation: %s", preload.Relation)
-		relInfo := h.getRelationshipInfo(modelType, preload.Relation)
+		relInfo := common.GetRelationshipInfo(modelType, preload.Relation)
 		if relInfo == nil {
 			logger.Warn("Relation %s not found in model", preload.Relation)
 			continue
@@ -1379,7 +1481,7 @@ func (h *Handler) applyPreloads(model interface{}, query common.SelectQuery, pre
 
 		// Use the field name (capitalized) for ORM preloading
 		// ORMs like GORM and Bun expect the struct field name, not the JSON name
-		relationFieldName := relInfo.fieldName
+		relationFieldName := relInfo.FieldName
 
 		// Validate and fix WHERE clause to ensure it contains the relation prefix
 		if len(preload.Where) > 0 {
@@ -1422,13 +1524,13 @@ func (h *Handler) applyPreloads(model interface{}, query common.SelectQuery, pre
 				copy(columns, preload.Columns)
 
 				// Add foreign key if not already present
-				if relInfo.foreignKey != "" {
+				if relInfo.ForeignKey != "" {
 					// Convert struct field name (e.g., DepartmentID) to snake_case (e.g., department_id)
-					foreignKeyColumn := toSnakeCase(relInfo.foreignKey)
+					foreignKeyColumn := toSnakeCase(relInfo.ForeignKey)
 
 					hasForeignKey := false
 					for _, col := range columns {
-						if col == foreignKeyColumn || col == relInfo.foreignKey {
+						if col == foreignKeyColumn || col == relInfo.ForeignKey {
 							hasForeignKey = true
 							break
 						}
@@ -1474,58 +1576,6 @@ func (h *Handler) applyPreloads(model interface{}, query common.SelectQuery, pre
 	return query, nil
 }
 
-func (h *Handler) getRelationshipInfo(modelType reflect.Type, relationName string) *relationshipInfo {
-	// Ensure we have a struct type
-	if modelType == nil || modelType.Kind() != reflect.Struct {
-		logger.Warn("Cannot get relationship info from non-struct type: %v", modelType)
-		return nil
-	}
-
-	for i := 0; i < modelType.NumField(); i++ {
-		field := modelType.Field(i)
-		jsonTag := field.Tag.Get("json")
-		jsonName := strings.Split(jsonTag, ",")[0]
-
-		if jsonName == relationName {
-			gormTag := field.Tag.Get("gorm")
-			info := &relationshipInfo{
-				fieldName: field.Name,
-				jsonName:  jsonName,
-			}
-
-			// Parse GORM tag to determine relationship type and keys
-			if strings.Contains(gormTag, "foreignKey") {
-				info.foreignKey = h.extractTagValue(gormTag, "foreignKey")
-				info.references = h.extractTagValue(gormTag, "references")
-
-				// Determine if it's belongsTo or hasMany/hasOne
-				if field.Type.Kind() == reflect.Slice {
-					info.relationType = "hasMany"
-				} else if field.Type.Kind() == reflect.Ptr || field.Type.Kind() == reflect.Struct {
-					info.relationType = "belongsTo"
-				}
-			} else if strings.Contains(gormTag, "many2many") {
-				info.relationType = "many2many"
-				info.joinTable = h.extractTagValue(gormTag, "many2many")
-			}
-
-			return info
-		}
-	}
-	return nil
-}
-
-func (h *Handler) extractTagValue(tag, key string) string {
-	parts := strings.Split(tag, ";")
-	for _, part := range parts {
-		part = strings.TrimSpace(part)
-		if strings.HasPrefix(part, key+":") {
-			return strings.TrimPrefix(part, key+":")
-		}
-	}
-	return ""
-}
-
 // toSnakeCase converts a PascalCase or camelCase string to snake_case
 func toSnakeCase(s string) string {
 	var result strings.Builder

pkg/resolvespec/handler_test.go

@@ -269,8 +269,6 @@ func TestToSnakeCase(t *testing.T) {
 }
 
 func TestExtractTagValue(t *testing.T) {
-	handler := NewHandler(nil, nil)
-
 	tests := []struct {
 		name     string
 		tag      string
@@ -311,9 +309,9 @@ func TestExtractTagValue(t *testing.T) {
 
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
-			result := handler.extractTagValue(tt.tag, tt.key)
+			result := common.ExtractTagValue(tt.tag, tt.key)
 			if result != tt.expected {
-				t.Errorf("extractTagValue(%q, %q) = %q, expected %q", tt.tag, tt.key, result, tt.expected)
+				t.Errorf("ExtractTagValue(%q, %q) = %q, expected %q", tt.tag, tt.key, result, tt.expected)
 			}
 		})
 	}

pkg/restheadspec/handler.go

@@ -766,7 +766,7 @@ func (h *Handler) applyPreloadWithRecursion(query common.SelectQuery, preload co
 			// Apply ComputedQL fields if any
 			if len(preload.ComputedQL) > 0 {
 				// Get the base table name from the related model
-				baseTableName := getTableNameFromModel(relatedModel)
+				baseTableName := common.GetTableNameFromModel(relatedModel)
 
 				// Convert the preload relation path to the appropriate alias format
 				// This is ORM-specific. Currently we only support Bun's format.
@@ -777,7 +777,7 @@ func (h *Handler) applyPreloadWithRecursion(query common.SelectQuery, preload co
 					underlyingType := fmt.Sprintf("%T", h.db.GetUnderlyingDB())
 					if strings.Contains(underlyingType, "bun.DB") {
 						// Use Bun's alias format: lowercase with double underscores
-						preloadAlias = relationPathToBunAlias(preload.Relation)
+						preloadAlias = common.RelationPathToBunAlias(preload.Relation)
 					}
 					// For GORM: GORM doesn't use the same alias format, and this fix
 					// may not be needed since GORM handles preloads differently
@@ -792,7 +792,7 @@ func (h *Handler) applyPreloadWithRecursion(query common.SelectQuery, preload co
 					// levels of recursive/nested preloads
 					adjustedExpr := colExpr
 					if baseTableName != "" && preloadAlias != "" {
-						adjustedExpr = replaceTableReferencesInSQL(colExpr, baseTableName, preloadAlias)
+						adjustedExpr = common.ReplaceTableReferencesInSQL(colExpr, baseTableName, preloadAlias)
 						if adjustedExpr != colExpr {
 							logger.Debug("Adjusted computed column expression for %s: '%s' -> '%s'",
 								colName, colExpr, adjustedExpr)
@@ -903,73 +903,6 @@ func (h *Handler) applyPreloadWithRecursion(query common.SelectQuery, preload co
 	return query
 }
 
-// relationPathToBunAlias converts a relation path like "MAL.MAL.DEF" to the Bun alias format "mal__mal__def"
-// Bun generates aliases for nested relations by lowercasing and replacing dots with double underscores
-func relationPathToBunAlias(relationPath string) string {
-	if relationPath == "" {
-		return ""
-	}
-	// Convert to lowercase and replace dots with double underscores
-	alias := strings.ToLower(relationPath)
-	alias = strings.ReplaceAll(alias, ".", "__")
-	return alias
-}
-
-// replaceTableReferencesInSQL replaces references to a base table name in a SQL expression
-// with the appropriate alias for the current preload level
-// For example, if baseTableName is "mastertaskitem" and targetAlias is "mal__mal",
-// it will replace "mastertaskitem.rid_mastertaskitem" with "mal__mal.rid_mastertaskitem"
-func replaceTableReferencesInSQL(sqlExpr, baseTableName, targetAlias string) string {
-	if sqlExpr == "" || baseTableName == "" || targetAlias == "" {
-		return sqlExpr
-	}
-
-	// Replace both quoted and unquoted table references
-	// Handle patterns like: tablename.column, "tablename".column, tablename."column", "tablename"."column"
-
-	// Pattern 1: tablename.column (unquoted)
-	result := strings.ReplaceAll(sqlExpr, baseTableName+".", targetAlias+".")
-
-	// Pattern 2: "tablename".column or "tablename"."column" (quoted table name)
-	result = strings.ReplaceAll(result, "\""+baseTableName+"\".", "\""+targetAlias+"\".")
-
-	return result
-}
-
-// getTableNameFromModel extracts the table name from a model
-// It checks the bun tag first, then falls back to converting the struct name to snake_case
-func getTableNameFromModel(model interface{}) string {
-	if model == nil {
-		return ""
-	}
-
-	modelType := reflect.TypeOf(model)
-
-	// Unwrap pointers
-	for modelType != nil && modelType.Kind() == reflect.Ptr {
-		modelType = modelType.Elem()
-	}
-
-	if modelType == nil || modelType.Kind() != reflect.Struct {
-		return ""
-	}
-
-	// Look for bun tag on embedded BaseModel
-	for i := 0; i < modelType.NumField(); i++ {
-		field := modelType.Field(i)
-		if field.Anonymous {
-			bunTag := field.Tag.Get("bun")
-			if strings.HasPrefix(bunTag, "table:") {
-				return strings.TrimPrefix(bunTag, "table:")
-			}
-		}
-	}
-
-	// Fallback: convert struct name to lowercase (simple heuristic)
-	// This handles cases like "MasterTaskItem" -> "mastertaskitem"
-	return strings.ToLower(modelType.Name())
-}
-
 func (h *Handler) handleCreate(ctx context.Context, w common.ResponseWriter, data interface{}, options ExtendedRequestOptions) {
 	// Capture panics and return error response
 	defer func() {
@@ -1239,6 +1172,26 @@ func (h *Handler) handleUpdate(ctx context.Context, w common.ResponseWriter, id
 		// Create temporary nested processor with transaction
 		txNestedProcessor := common.NewNestedCUDProcessor(tx, h.registry, h)
 
+		// First, read the existing record from the database
+		existingRecord := reflect.New(reflection.GetPointerElement(reflect.TypeOf(model))).Interface()
+		selectQuery := tx.NewSelect().Model(existingRecord).Where(fmt.Sprintf("%s = ?", common.QuoteIdent(pkName)), targetID)
+		if err := selectQuery.ScanModel(ctx); err != nil {
+			if err == sql.ErrNoRows {
+				return fmt.Errorf("record not found with ID: %v", targetID)
+			}
+			return fmt.Errorf("failed to fetch existing record: %w", err)
+		}
+
+		// Convert existing record to map
+		existingMap := make(map[string]interface{})
+		jsonData, err := json.Marshal(existingRecord)
+		if err != nil {
+			return fmt.Errorf("failed to marshal existing record: %w", err)
+		}
+		if err := json.Unmarshal(jsonData, &existingMap); err != nil {
+			return fmt.Errorf("failed to unmarshal existing record: %w", err)
+		}
+
 		// Extract nested relations if present (but don't process them yet)
 		var nestedRelations map[string]interface{}
 		if h.shouldUseNestedProcessor(dataMap, model) {
@@ -1251,15 +1204,30 @@ func (h *Handler) handleUpdate(ctx context.Context, w common.ResponseWriter, id
 			nestedRelations = relations
 		}
 
+		// Merge only non-null and non-empty values from the incoming request into the existing record
+		for key, newValue := range dataMap {
+			// Skip if the value is nil
+			if newValue == nil {
+				continue
+			}
+
+			// Skip if the value is an empty string
+			if strVal, ok := newValue.(string); ok && strVal == "" {
+				continue
+			}
+
+			// Update the existing map with the new value
+			existingMap[key] = newValue
+		}
+
 		// Ensure ID is in the data map for the update
-		dataMap[pkName] = targetID
+		existingMap[pkName] = targetID
+		dataMap = existingMap
 
 		// Populate model instance from dataMap to preserve custom types (like SqlJSONB)
 		// Get the type of the model, handling both pointer and non-pointer types
 		modelType := reflect.TypeOf(model)
-		if modelType.Kind() == reflect.Ptr {
-			modelType = modelType.Elem()
-		}
+		modelType = reflection.GetPointerElement(modelType)
 		modelInstance := reflect.New(modelType).Interface()
 		if err := reflection.MapToStruct(dataMap, modelInstance); err != nil {
 			return fmt.Errorf("failed to populate model from data: %w", err)
@@ -1297,7 +1265,7 @@ func (h *Handler) handleUpdate(ctx context.Context, w common.ResponseWriter, id
 
 		// Fetch the updated record to return the new values
 		modelValue := reflect.New(reflect.TypeOf(model)).Interface()
-		selectQuery := tx.NewSelect().Model(modelValue).Where(fmt.Sprintf("%s = ?", common.QuoteIdent(pkName)), targetID)
+		selectQuery = tx.NewSelect().Model(modelValue).Where(fmt.Sprintf("%s = ?", common.QuoteIdent(pkName)), targetID)
 		if err := selectQuery.ScanModel(ctx); err != nil {
 			return fmt.Errorf("failed to fetch updated record: %w", err)
 		}
@@ -1563,9 +1531,7 @@ func (h *Handler) handleDelete(ctx context.Context, w common.ResponseWriter, id
 
 	// First, fetch the record that will be deleted
 	modelType := reflect.TypeOf(model)
-	if modelType.Kind() == reflect.Ptr {
-		modelType = modelType.Elem()
-	}
+	modelType = reflection.GetPointerElement(modelType)
 	recordToDelete := reflect.New(modelType).Interface()
 
 	selectQuery := h.db.NewSelect().Model(recordToDelete).Where(fmt.Sprintf("%s = ?", common.QuoteIdent(pkName)), id)
@@ -2537,10 +2503,10 @@ func (h *Handler) filterExtendedOptions(validator *common.ColumnValidator, optio
 		filteredExpand := expand
 
 		// Get the relationship info for this expand relation
-		relInfo := h.getRelationshipInfo(modelType, expand.Relation)
-		if relInfo != nil && relInfo.relatedModel != nil {
+		relInfo := common.GetRelationshipInfo(modelType, expand.Relation)
+		if relInfo != nil && relInfo.RelatedModel != nil {
 			// Create a validator for the related model
-			expandValidator := common.NewColumnValidator(relInfo.relatedModel)
+			expandValidator := common.NewColumnValidator(relInfo.RelatedModel)
 			// Filter columns using the related model's validator
 			filteredExpand.Columns = expandValidator.FilterValidColumns(expand.Columns)
 
@@ -2617,110 +2583,7 @@ func (h *Handler) shouldUseNestedProcessor(data map[string]interface{}, model in
 
 // GetRelationshipInfo implements common.RelationshipInfoProvider interface
 func (h *Handler) GetRelationshipInfo(modelType reflect.Type, relationName string) *common.RelationshipInfo {
-	info := h.getRelationshipInfo(modelType, relationName)
-	if info == nil {
-		return nil
-	}
-	// Convert internal type to common type
-	return &common.RelationshipInfo{
-		FieldName:    info.fieldName,
-		JSONName:     info.jsonName,
-		RelationType: info.relationType,
-		ForeignKey:   info.foreignKey,
-		References:   info.references,
-		JoinTable:    info.joinTable,
-		RelatedModel: info.relatedModel,
-	}
-}
-
-type relationshipInfo struct {
-	fieldName    string
-	jsonName     string
-	relationType string // "belongsTo", "hasMany", "hasOne", "many2many"
-	foreignKey   string
-	references   string
-	joinTable    string
-	relatedModel interface{}
-}
-
-func (h *Handler) getRelationshipInfo(modelType reflect.Type, relationName string) *relationshipInfo {
-	// Ensure we have a struct type
-	if modelType == nil || modelType.Kind() != reflect.Struct {
-		logger.Warn("Cannot get relationship info from non-struct type: %v", modelType)
-		return nil
-	}
-
-	for i := 0; i < modelType.NumField(); i++ {
-		field := modelType.Field(i)
-		jsonTag := field.Tag.Get("json")
-		jsonName := strings.Split(jsonTag, ",")[0]
-
-		if jsonName == relationName {
-			gormTag := field.Tag.Get("gorm")
-			info := &relationshipInfo{
-				fieldName: field.Name,
-				jsonName:  jsonName,
-			}
-
-			// Parse GORM tag to determine relationship type and keys
-			if strings.Contains(gormTag, "foreignKey") {
-				info.foreignKey = h.extractTagValue(gormTag, "foreignKey")
-				info.references = h.extractTagValue(gormTag, "references")
-
-				// Determine if it's belongsTo or hasMany/hasOne
-				if field.Type.Kind() == reflect.Slice {
-					info.relationType = "hasMany"
-					// Get the element type for slice
-					elemType := field.Type.Elem()
-					if elemType.Kind() == reflect.Ptr {
-						elemType = elemType.Elem()
-					}
-					if elemType.Kind() == reflect.Struct {
-						info.relatedModel = reflect.New(elemType).Elem().Interface()
-					}
-				} else if field.Type.Kind() == reflect.Ptr || field.Type.Kind() == reflect.Struct {
-					info.relationType = "belongsTo"
-					elemType := field.Type
-					if elemType.Kind() == reflect.Ptr {
-						elemType = elemType.Elem()
-					}
-					if elemType.Kind() == reflect.Struct {
-						info.relatedModel = reflect.New(elemType).Elem().Interface()
-					}
-				}
-			} else if strings.Contains(gormTag, "many2many") {
-				info.relationType = "many2many"
-				info.joinTable = h.extractTagValue(gormTag, "many2many")
-				// Get the element type for many2many (always slice)
-				if field.Type.Kind() == reflect.Slice {
-					elemType := field.Type.Elem()
-					if elemType.Kind() == reflect.Ptr {
-						elemType = elemType.Elem()
-					}
-					if elemType.Kind() == reflect.Struct {
-						info.relatedModel = reflect.New(elemType).Elem().Interface()
-					}
-				}
-			} else {
-				// Field has no GORM relationship tags, so it's not a relation
-				return nil
-			}
-
-			return info
-		}
-	}
-	return nil
-}
-
-func (h *Handler) extractTagValue(tag, key string) string {
-	parts := strings.Split(tag, ";")
-	for _, part := range parts {
-		part = strings.TrimSpace(part)
-		if strings.HasPrefix(part, key+":") {
-			return strings.TrimPrefix(part, key+":")
-		}
-	}
-	return ""
+	return common.GetRelationshipInfo(modelType, relationName)
 }
 
 // HandleOpenAPI generates and returns the OpenAPI specification

pkg/restheadspec/restheadspec_test.go

@@ -2,6 +2,8 @@ package restheadspec
 
 import (
 	"testing"
+
+	"github.com/bitechdev/ResolveSpec/pkg/common"
 )
 
 func TestParseModelName(t *testing.T) {
@@ -112,3 +114,88 @@ func TestNewStandardBunRouter(t *testing.T) {
 		t.Error("Expected router to be created, got nil")
 	}
 }
+
+func TestExtractTagValue(t *testing.T) {
+	tests := []struct {
+		name     string
+		tag      string
+		key      string
+		expected string
+	}{
+		{
+			name:     "Extract existing key",
+			tag:      "json:name;validate:required",
+			key:      "json",
+			expected: "name",
+		},
+		{
+			name:     "Extract key with spaces",
+			tag:      "json:name ; validate:required",
+			key:      "validate",
+			expected: "required",
+		},
+		{
+			name:     "Extract key at end",
+			tag:      "json:name;validate:required;db:column_name",
+			key:      "db",
+			expected: "column_name",
+		},
+		{
+			name:     "Extract key at beginning",
+			tag:      "primary:true;json:id;db:user_id",
+			key:      "primary",
+			expected: "true",
+		},
+		{
+			name:     "Key not found",
+			tag:      "json:name;validate:required",
+			key:      "db",
+			expected: "",
+		},
+		{
+			name:     "Empty tag",
+			tag:      "",
+			key:      "json",
+			expected: "",
+		},
+		{
+			name:     "Single key-value pair",
+			tag:      "json:name",
+			key:      "json",
+			expected: "name",
+		},
+		{
+			name:     "Key with empty value",
+			tag:      "json:;validate:required",
+			key:      "json",
+			expected: "",
+		},
+		{
+			name:     "Key with complex value",
+			tag:      "json:user_name,omitempty;validate:required,min=3",
+			key:      "json",
+			expected: "user_name,omitempty",
+		},
+		{
+			name:     "Multiple semicolons",
+			tag:      "json:name;;validate:required",
+			key:      "validate",
+			expected: "required",
+		},
+		{
+			name:     "BUN Tag",
+			tag:      "rel:has-many,join:rid_hub=rid_hub_child",
+			key:      "join",
+			expected: "rid_hub=rid_hub_child",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			result := common.ExtractTagValue(tt.tag, tt.key)
+			if result != tt.expected {
+				t.Errorf("ExtractTagValue(%q, %q) = %q; want %q", tt.tag, tt.key, result, tt.expected)
+			}
+		})
+	}
+}