Reflect safty

make_release.sh

@@ -15,12 +15,12 @@ if [[ $make_release =~ ^[Yy]$ ]]; then
     fi
 
     # Create an annotated tag
-    git tag -a "$version" -m "Released Core $version"
+    git tag -a "$version" -m "Released $version"
 
     # Push the tag to the remote repository
     git push origin "$version"
 
-    echo "Tag $version created for Core and pushed to the remote repository."
+    echo "Tag $version created and pushed to the remote repository."
 else
     echo "No release version created."
 fi

pkg/modelregistry/model_registry.go

@@ -38,12 +38,28 @@ func (r *DefaultModelRegistry) RegisterModel(name string, model interface{}) err
 		return fmt.Errorf("model cannot be nil")
 	}
 
-	if modelType.Kind() == reflect.Ptr {
-		return fmt.Errorf("model must be a non-pointer struct, got pointer to %s", modelType.Elem().Kind())
+	originalType := modelType
+
+	// Unwrap pointers, slices, and arrays to check the underlying type
+	for modelType.Kind() == reflect.Ptr || modelType.Kind() == reflect.Slice || modelType.Kind() == reflect.Array {
+		modelType = modelType.Elem()
 	}
 
+	// Validate that the underlying type is a struct
 	if modelType.Kind() != reflect.Struct {
-		return fmt.Errorf("model must be a struct, got %s", modelType.Kind())
+		return fmt.Errorf("model must be a struct or pointer to struct, got %s", originalType.String())
+	}
+
+	// If a pointer/slice/array was passed, unwrap to the base struct
+	if originalType != modelType {
+		// Create a zero value of the struct type
+		model = reflect.New(modelType).Elem().Interface()
+	}
+
+	// Additional check: ensure model is not a pointer
+	finalType := reflect.TypeOf(model)
+	if finalType.Kind() == reflect.Ptr {
+		return fmt.Errorf("model must be a non-pointer struct, got pointer to %s. Use MyModel{} instead of &MyModel{}", finalType.Elem().Name())
 	}
 
 	r.models[name] = model

pkg/resolvespec/context.go

@@ -0,0 +1,85 @@
+package resolvespec
+
+import (
+	"context"
+)
+
+// Context keys for request-scoped data
+type contextKey string
+
+const (
+	contextKeySchema    contextKey = "schema"
+	contextKeyEntity    contextKey = "entity"
+	contextKeyTableName contextKey = "tableName"
+	contextKeyModel     contextKey = "model"
+	contextKeyModelPtr  contextKey = "modelPtr"
+)
+
+// WithSchema adds schema to context
+func WithSchema(ctx context.Context, schema string) context.Context {
+	return context.WithValue(ctx, contextKeySchema, schema)
+}
+
+// GetSchema retrieves schema from context
+func GetSchema(ctx context.Context) string {
+	if v := ctx.Value(contextKeySchema); v != nil {
+		return v.(string)
+	}
+	return ""
+}
+
+// WithEntity adds entity to context
+func WithEntity(ctx context.Context, entity string) context.Context {
+	return context.WithValue(ctx, contextKeyEntity, entity)
+}
+
+// GetEntity retrieves entity from context
+func GetEntity(ctx context.Context) string {
+	if v := ctx.Value(contextKeyEntity); v != nil {
+		return v.(string)
+	}
+	return ""
+}
+
+// WithTableName adds table name to context
+func WithTableName(ctx context.Context, tableName string) context.Context {
+	return context.WithValue(ctx, contextKeyTableName, tableName)
+}
+
+// GetTableName retrieves table name from context
+func GetTableName(ctx context.Context) string {
+	if v := ctx.Value(contextKeyTableName); v != nil {
+		return v.(string)
+	}
+	return ""
+}
+
+// WithModel adds model to context
+func WithModel(ctx context.Context, model interface{}) context.Context {
+	return context.WithValue(ctx, contextKeyModel, model)
+}
+
+// GetModel retrieves model from context
+func GetModel(ctx context.Context) interface{} {
+	return ctx.Value(contextKeyModel)
+}
+
+// WithModelPtr adds model pointer to context
+func WithModelPtr(ctx context.Context, modelPtr interface{}) context.Context {
+	return context.WithValue(ctx, contextKeyModelPtr, modelPtr)
+}
+
+// GetModelPtr retrieves model pointer from context
+func GetModelPtr(ctx context.Context) interface{} {
+	return ctx.Value(contextKeyModelPtr)
+}
+
+// WithRequestData adds all request-scoped data to context at once
+func WithRequestData(ctx context.Context, schema, entity, tableName string, model, modelPtr interface{}) context.Context {
+	ctx = WithSchema(ctx, schema)
+	ctx = WithEntity(ctx, entity)
+	ctx = WithTableName(ctx, tableName)
+	ctx = WithModel(ctx, model)
+	ctx = WithModelPtr(ctx, modelPtr)
+	return ctx
+}

pkg/resolvespec/handler.go

@@ -6,6 +6,7 @@ import (
 	"fmt"
 	"net/http"
 	"reflect"
+	"runtime/debug"
 	"strings"
 
 	"github.com/Warky-Devs/ResolveSpec/pkg/common"
@@ -26,8 +27,22 @@ func NewHandler(db common.Database, registry common.ModelRegistry) *Handler {
 	}
 }
 
+// handlePanic is a helper function to handle panics with stack traces
+func (h *Handler) handlePanic(w common.ResponseWriter, method string, err interface{}) {
+	stack := debug.Stack()
+	logger.Error("Panic in %s: %v\nStack trace:\n%s", method, err, string(stack))
+	h.sendError(w, http.StatusInternalServerError, "internal_error", fmt.Sprintf("Internal server error in %s", method), fmt.Errorf("%v", err))
+}
+
 // Handle processes API requests through router-agnostic interface
 func (h *Handler) Handle(w common.ResponseWriter, r common.Request, params map[string]string) {
+	// Capture panics and return error response
+	defer func() {
+		if err := recover(); err != nil {
+			h.handlePanic(w, "Handle", err)
+		}
+	}()
+
 	ctx := context.Background()
 
 	body, err := r.Body()
@@ -50,15 +65,50 @@ func (h *Handler) Handle(w common.ResponseWriter, r common.Request, params map[s
 
 	logger.Info("Handling %s operation for %s.%s", req.Operation, schema, entity)
 
+	// Get model and populate context with request-scoped data
+	model, err := h.registry.GetModelByEntity(schema, entity)
+	if err != nil {
+		logger.Error("Invalid entity: %v", err)
+		h.sendError(w, http.StatusBadRequest, "invalid_entity", "Invalid entity", err)
+		return
+	}
+
+	// Validate that the model is a struct type (not a slice or pointer to slice)
+	modelType := reflect.TypeOf(model)
+	originalType := modelType
+	for modelType != nil && (modelType.Kind() == reflect.Ptr || modelType.Kind() == reflect.Slice || modelType.Kind() == reflect.Array) {
+		modelType = modelType.Elem()
+	}
+
+	if modelType == nil || modelType.Kind() != reflect.Struct {
+		logger.Error("Model for %s.%s must be a struct type, got %v. Please register models as struct types, not slices or pointers to slices.", schema, entity, originalType)
+		h.sendError(w, http.StatusInternalServerError, "invalid_model_type",
+			fmt.Sprintf("Model must be a struct type, got %v. Ensure you register the struct (e.g., ModelCoreAccount{}) not a slice (e.g., []*ModelCoreAccount)", originalType),
+			fmt.Errorf("invalid model type: %v", originalType))
+		return
+	}
+
+	// If the registered model was a pointer or slice, use the unwrapped struct type
+	if originalType != modelType {
+		model = reflect.New(modelType).Elem().Interface()
+	}
+
+	// Create a pointer to the model type for database operations
+	modelPtr := reflect.New(reflect.TypeOf(model)).Interface()
+	tableName := h.getTableName(schema, entity, model)
+
+	// Add request-scoped data to context
+	ctx = WithRequestData(ctx, schema, entity, tableName, model, modelPtr)
+
 	switch req.Operation {
 	case "read":
-		h.handleRead(ctx, w, schema, entity, id, req.Options)
+		h.handleRead(ctx, w, id, req.Options)
 	case "create":
-		h.handleCreate(ctx, w, schema, entity, req.Data, req.Options)
+		h.handleCreate(ctx, w, req.Data, req.Options)
 	case "update":
-		h.handleUpdate(ctx, w, schema, entity, id, req.ID, req.Data, req.Options)
+		h.handleUpdate(ctx, w, id, req.ID, req.Data, req.Options)
 	case "delete":
-		h.handleDelete(ctx, w, schema, entity, id)
+		h.handleDelete(ctx, w, id)
 	default:
 		logger.Error("Invalid operation: %s", req.Operation)
 		h.sendError(w, http.StatusBadRequest, "invalid_operation", "Invalid operation", nil)
@@ -67,6 +117,13 @@ func (h *Handler) Handle(w common.ResponseWriter, r common.Request, params map[s
 
 // HandleGet processes GET requests for metadata
 func (h *Handler) HandleGet(w common.ResponseWriter, r common.Request, params map[string]string) {
+	// Capture panics and return error response
+	defer func() {
+		if err := recover(); err != nil {
+			h.handlePanic(w, "HandleGet", err)
+		}
+	}()
+
 	schema := params["schema"]
 	entity := params["entity"]
 
@@ -83,24 +140,37 @@ func (h *Handler) HandleGet(w common.ResponseWriter, r common.Request, params ma
 	h.sendResponse(w, metadata, nil)
 }
 
-func (h *Handler) handleRead(ctx context.Context, w common.ResponseWriter, schema, entity, id string, options common.RequestOptions) {
-	logger.Info("Reading records from %s.%s", schema, entity)
+func (h *Handler) handleRead(ctx context.Context, w common.ResponseWriter, id string, options common.RequestOptions) {
+	// Capture panics and return error response
+	defer func() {
+		if err := recover(); err != nil {
+			h.handlePanic(w, "handleRead", err)
+		}
+	}()
 
-	model, err := h.registry.GetModelByEntity(schema, entity)
-	if err != nil {
-		logger.Error("Invalid entity: %v", err)
-		h.sendError(w, http.StatusBadRequest, "invalid_entity", "Invalid entity", err)
+	schema := GetSchema(ctx)
+	entity := GetEntity(ctx)
+	tableName := GetTableName(ctx)
+	model := GetModel(ctx)
+
+	// Validate and unwrap model type to get base struct
+	modelType := reflect.TypeOf(model)
+	for modelType != nil && (modelType.Kind() == reflect.Ptr || modelType.Kind() == reflect.Slice || modelType.Kind() == reflect.Array) {
+		modelType = modelType.Elem()
+	}
+
+	if modelType == nil || modelType.Kind() != reflect.Struct {
+		logger.Error("Model must be a struct type, got %v for %s.%s", modelType, schema, entity)
+		h.sendError(w, http.StatusInternalServerError, "invalid_model", "Model must be a struct type", fmt.Errorf("invalid model type: %v", modelType))
 		return
 	}
 
-	// Model is now a non-pointer struct, create a pointer instance for ORM
-	modelType := reflect.TypeOf(model)
+	// Create a pointer to the model type for database operations
 	modelPtr := reflect.New(modelType).Interface()
 
-	query := h.db.NewSelect().Model(modelPtr)
+	logger.Info("Reading records from %s.%s", schema, entity)
 
-	// Get table name
-	tableName := h.getTableName(schema, entity, model)
+	query := h.db.NewSelect().Model(modelPtr)
 	query = query.Table(tableName)
 
 	// Apply column selection
@@ -153,7 +223,7 @@ func (h *Handler) handleRead(ctx context.Context, w common.ResponseWriter, schem
 	var result interface{}
 	if id != "" {
 		logger.Debug("Querying single record with ID: %s", id)
-		// Create a pointer to the struct type for scanning
+		// Create a pointer to the struct type for scanning - use modelType which is already unwrapped
 		singleResult := reflect.New(modelType).Interface()
 		query = query.Where("id = ?", id)
 		if err := query.Scan(ctx, singleResult); err != nil {
@@ -164,8 +234,8 @@ func (h *Handler) handleRead(ctx context.Context, w common.ResponseWriter, schem
 		result = singleResult
 	} else {
 		logger.Debug("Querying multiple records")
-		// Create a slice of the struct type (not pointers)
-		sliceType := reflect.SliceOf(modelType)
+		// Create a slice of pointers to the model type - use modelType which is already unwrapped
+		sliceType := reflect.SliceOf(reflect.PointerTo(modelType))
 		results := reflect.New(sliceType).Interface()
 
 		if err := query.Scan(ctx, results); err != nil {
@@ -195,17 +265,20 @@ func (h *Handler) handleRead(ctx context.Context, w common.ResponseWriter, schem
 	})
 }
 
-func (h *Handler) handleCreate(ctx context.Context, w common.ResponseWriter, schema, entity string, data interface{}, options common.RequestOptions) {
+func (h *Handler) handleCreate(ctx context.Context, w common.ResponseWriter, data interface{}, options common.RequestOptions) {
+	// Capture panics and return error response
+	defer func() {
+		if err := recover(); err != nil {
+			h.handlePanic(w, "handleCreate", err)
+		}
+	}()
+
+	schema := GetSchema(ctx)
+	entity := GetEntity(ctx)
+	tableName := GetTableName(ctx)
+
 	logger.Info("Creating records for %s.%s", schema, entity)
 
-	// Get the model to determine the actual table name
-	model, err := h.registry.GetModelByEntity(schema, entity)
-	if err != nil {
-		logger.Warn("Model not found, using default table name")
-		model = nil
-	}
-
-	tableName := h.getTableName(schema, entity, model)
 	query := h.db.NewInsert().Table(tableName)
 
 	switch v := data.(type) {
@@ -275,18 +348,20 @@ func (h *Handler) handleCreate(ctx context.Context, w common.ResponseWriter, sch
 	}
 }
 
-func (h *Handler) handleUpdate(ctx context.Context, w common.ResponseWriter, schema, entity, urlID string, reqID interface{}, data interface{}, options common.RequestOptions) {
+func (h *Handler) handleUpdate(ctx context.Context, w common.ResponseWriter, urlID string, reqID interface{}, data interface{}, options common.RequestOptions) {
+	// Capture panics and return error response
+	defer func() {
+		if err := recover(); err != nil {
+			h.handlePanic(w, "handleUpdate", err)
+		}
+	}()
+
+	schema := GetSchema(ctx)
+	entity := GetEntity(ctx)
+	tableName := GetTableName(ctx)
+
 	logger.Info("Updating records for %s.%s", schema, entity)
 
-	// Get the model to determine the actual table name
-	model, err := h.registry.GetModelByEntity(schema, entity)
-	if err != nil {
-		logger.Warn("Model not found, using default table name")
-		// Fallback to entity name (without schema for SQLite compatibility)
-		model = nil
-	}
-
-	tableName := h.getTableName(schema, entity, model)
 	query := h.db.NewUpdate().Table(tableName)
 
 	switch updates := data.(type) {
@@ -330,7 +405,18 @@ func (h *Handler) handleUpdate(ctx context.Context, w common.ResponseWriter, sch
 	h.sendResponse(w, data, nil)
 }
 
-func (h *Handler) handleDelete(ctx context.Context, w common.ResponseWriter, schema, entity, id string) {
+func (h *Handler) handleDelete(ctx context.Context, w common.ResponseWriter, id string) {
+	// Capture panics and return error response
+	defer func() {
+		if err := recover(); err != nil {
+			h.handlePanic(w, "handleDelete", err)
+		}
+	}()
+
+	schema := GetSchema(ctx)
+	entity := GetEntity(ctx)
+	tableName := GetTableName(ctx)
+
 	logger.Info("Deleting records from %s.%s", schema, entity)
 
 	if id == "" {
@@ -339,14 +425,6 @@ func (h *Handler) handleDelete(ctx context.Context, w common.ResponseWriter, sch
 		return
 	}
 
-	// Get the model to determine the actual table name
-	model, err := h.registry.GetModelByEntity(schema, entity)
-	if err != nil {
-		logger.Warn("Model not found, using default table name")
-		model = nil
-	}
-
-	tableName := h.getTableName(schema, entity, model)
 	query := h.db.NewDelete().Table(tableName).Where("id = ?", id)
 
 	result, err := query.Exec(ctx)
@@ -400,10 +478,23 @@ func (h *Handler) getTableName(schema, entity string, model interface{}) string
 
 func (h *Handler) generateMetadata(schema, entity string, model interface{}) *common.TableMetadata {
 	modelType := reflect.TypeOf(model)
-	if modelType.Kind() == reflect.Ptr {
+
+	// Unwrap pointers, slices, and arrays to get to the base struct type
+	for modelType != nil && (modelType.Kind() == reflect.Ptr || modelType.Kind() == reflect.Slice || modelType.Kind() == reflect.Array) {
 		modelType = modelType.Elem()
 	}
 
+	// Validate that we have a struct type
+	if modelType == nil || modelType.Kind() != reflect.Struct {
+		logger.Error("Model type must be a struct, got %v for %s.%s", modelType, schema, entity)
+		return &common.TableMetadata{
+			Schema:    schema,
+			Table:     entity,
+			Columns:   make([]common.Column, 0),
+			Relations: make([]string, 0),
+		}
+	}
+
 	metadata := &common.TableMetadata{
 		Schema:    schema,
 		Table:     entity,
@@ -547,10 +638,18 @@ type relationshipInfo struct {
 
 func (h *Handler) applyPreloads(model interface{}, query common.SelectQuery, preloads []common.PreloadOption) common.SelectQuery {
 	modelType := reflect.TypeOf(model)
-	if modelType.Kind() == reflect.Ptr {
+
+	// Unwrap pointers, slices, and arrays to get to the base struct type
+	for modelType != nil && (modelType.Kind() == reflect.Ptr || modelType.Kind() == reflect.Slice || modelType.Kind() == reflect.Array) {
 		modelType = modelType.Elem()
 	}
 
+	// Validate that we have a struct type
+	if modelType == nil || modelType.Kind() != reflect.Struct {
+		logger.Warn("Cannot apply preloads to non-struct type: %v", modelType)
+		return query
+	}
+
 	for _, preload := range preloads {
 		logger.Debug("Processing preload for relation: %s", preload.Relation)
 		relInfo := h.getRelationshipInfo(modelType, preload.Relation)
@@ -574,6 +673,12 @@ func (h *Handler) applyPreloads(model interface{}, query common.SelectQuery, pre
 }
 
 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")

pkg/restheadspec/context.go

@@ -0,0 +1,85 @@
+package restheadspec
+
+import (
+	"context"
+)
+
+// Context keys for request-scoped data
+type contextKey string
+
+const (
+	contextKeySchema    contextKey = "schema"
+	contextKeyEntity    contextKey = "entity"
+	contextKeyTableName contextKey = "tableName"
+	contextKeyModel     contextKey = "model"
+	contextKeyModelPtr  contextKey = "modelPtr"
+)
+
+// WithSchema adds schema to context
+func WithSchema(ctx context.Context, schema string) context.Context {
+	return context.WithValue(ctx, contextKeySchema, schema)
+}
+
+// GetSchema retrieves schema from context
+func GetSchema(ctx context.Context) string {
+	if v := ctx.Value(contextKeySchema); v != nil {
+		return v.(string)
+	}
+	return ""
+}
+
+// WithEntity adds entity to context
+func WithEntity(ctx context.Context, entity string) context.Context {
+	return context.WithValue(ctx, contextKeyEntity, entity)
+}
+
+// GetEntity retrieves entity from context
+func GetEntity(ctx context.Context) string {
+	if v := ctx.Value(contextKeyEntity); v != nil {
+		return v.(string)
+	}
+	return ""
+}
+
+// WithTableName adds table name to context
+func WithTableName(ctx context.Context, tableName string) context.Context {
+	return context.WithValue(ctx, contextKeyTableName, tableName)
+}
+
+// GetTableName retrieves table name from context
+func GetTableName(ctx context.Context) string {
+	if v := ctx.Value(contextKeyTableName); v != nil {
+		return v.(string)
+	}
+	return ""
+}
+
+// WithModel adds model to context
+func WithModel(ctx context.Context, model interface{}) context.Context {
+	return context.WithValue(ctx, contextKeyModel, model)
+}
+
+// GetModel retrieves model from context
+func GetModel(ctx context.Context) interface{} {
+	return ctx.Value(contextKeyModel)
+}
+
+// WithModelPtr adds model pointer to context
+func WithModelPtr(ctx context.Context, modelPtr interface{}) context.Context {
+	return context.WithValue(ctx, contextKeyModelPtr, modelPtr)
+}
+
+// GetModelPtr retrieves model pointer from context
+func GetModelPtr(ctx context.Context) interface{} {
+	return ctx.Value(contextKeyModelPtr)
+}
+
+// WithRequestData adds all request-scoped data to context at once
+func WithRequestData(ctx context.Context, schema, entity, tableName string, model, modelPtr interface{}) context.Context {
+	ctx = WithSchema(ctx, schema)
+	ctx = WithEntity(ctx, entity)
+	ctx = WithTableName(ctx, tableName)
+	ctx = WithModel(ctx, model)
+	ctx = WithModelPtr(ctx, modelPtr)
+	return ctx
+}

pkg/restheadspec/handler.go

@@ -6,6 +6,7 @@ import (
 	"fmt"
 	"net/http"
 	"reflect"
+	"runtime/debug"
 	"strings"
 
 	"github.com/Warky-Devs/ResolveSpec/pkg/common"
@@ -27,9 +28,23 @@ func NewHandler(db common.Database, registry common.ModelRegistry) *Handler {
 	}
 }
 
+// handlePanic is a helper function to handle panics with stack traces
+func (h *Handler) handlePanic(w common.ResponseWriter, method string, err interface{}) {
+	stack := debug.Stack()
+	logger.Error("Panic in %s: %v\nStack trace:\n%s", method, err, string(stack))
+	h.sendError(w, http.StatusInternalServerError, "internal_error", fmt.Sprintf("Internal server error in %s", method), fmt.Errorf("%v", err))
+}
+
 // Handle processes API requests through router-agnostic interface
 // Options are read from HTTP headers instead of request body
 func (h *Handler) Handle(w common.ResponseWriter, r common.Request, params map[string]string) {
+	// Capture panics and return error response
+	defer func() {
+		if err := recover(); err != nil {
+			h.handlePanic(w, "Handle", err)
+		}
+	}()
+
 	ctx := context.Background()
 
 	schema := params["schema"]
@@ -44,14 +59,48 @@ func (h *Handler) Handle(w common.ResponseWriter, r common.Request, params map[s
 
 	logger.Info("Handling %s request for %s.%s", method, schema, entity)
 
+	// Get model and populate context with request-scoped data
+	model, err := h.registry.GetModelByEntity(schema, entity)
+	if err != nil {
+		logger.Error("Invalid entity: %v", err)
+		h.sendError(w, http.StatusBadRequest, "invalid_entity", "Invalid entity", err)
+		return
+	}
+
+	// Validate that the model is a struct type (not a slice or pointer to slice)
+	modelType := reflect.TypeOf(model)
+	originalType := modelType
+	for modelType != nil && (modelType.Kind() == reflect.Ptr || modelType.Kind() == reflect.Slice || modelType.Kind() == reflect.Array) {
+		modelType = modelType.Elem()
+	}
+
+	if modelType == nil || modelType.Kind() != reflect.Struct {
+		logger.Error("Model for %s.%s must be a struct type, got %v. Please register models as struct types, not slices or pointers to slices.", schema, entity, originalType)
+		h.sendError(w, http.StatusInternalServerError, "invalid_model_type",
+			fmt.Sprintf("Model must be a struct type, got %v. Ensure you register the struct (e.g., ModelCoreAccount{}) not a slice (e.g., []*ModelCoreAccount)", originalType),
+			fmt.Errorf("invalid model type: %v", originalType))
+		return
+	}
+
+	// If the registered model was a pointer or slice, use the unwrapped struct type
+	if originalType != modelType {
+		model = reflect.New(modelType).Elem().Interface()
+	}
+
+	modelPtr := reflect.New(reflect.TypeOf(model)).Interface()
+	tableName := h.getTableName(schema, entity, model)
+
+	// Add request-scoped data to context
+	ctx = WithRequestData(ctx, schema, entity, tableName, model, modelPtr)
+
 	switch method {
 	case "GET":
 		if id != "" {
 			// GET with ID - read single record
-			h.handleRead(ctx, w, schema, entity, id, options)
+			h.handleRead(ctx, w, id, options)
 		} else {
 			// GET without ID - read multiple records
-			h.handleRead(ctx, w, schema, entity, "", options)
+			h.handleRead(ctx, w, "", options)
 		}
 	case "POST":
 		// Create operation
@@ -67,7 +116,7 @@ func (h *Handler) Handle(w common.ResponseWriter, r common.Request, params map[s
 			h.sendError(w, http.StatusBadRequest, "invalid_request", "Invalid request body", err)
 			return
 		}
-		h.handleCreate(ctx, w, schema, entity, data, options)
+		h.handleCreate(ctx, w, data, options)
 	case "PUT", "PATCH":
 		// Update operation
 		body, err := r.Body()
@@ -82,9 +131,9 @@ func (h *Handler) Handle(w common.ResponseWriter, r common.Request, params map[s
 			h.sendError(w, http.StatusBadRequest, "invalid_request", "Invalid request body", err)
 			return
 		}
-		h.handleUpdate(ctx, w, schema, entity, id, nil, data, options)
+		h.handleUpdate(ctx, w, id, nil, data, options)
 	case "DELETE":
-		h.handleDelete(ctx, w, schema, entity, id)
+		h.handleDelete(ctx, w, id)
 	default:
 		logger.Error("Invalid HTTP method: %s", method)
 		h.sendError(w, http.StatusMethodNotAllowed, "invalid_method", "Invalid HTTP method", nil)
@@ -93,6 +142,13 @@ func (h *Handler) Handle(w common.ResponseWriter, r common.Request, params map[s
 
 // HandleGet processes GET requests for metadata
 func (h *Handler) HandleGet(w common.ResponseWriter, r common.Request, params map[string]string) {
+	// Capture panics and return error response
+	defer func() {
+		if err := recover(); err != nil {
+			h.handlePanic(w, "HandleGet", err)
+		}
+	}()
+
 	schema := params["schema"]
 	entity := params["entity"]
 
@@ -111,20 +167,37 @@ func (h *Handler) HandleGet(w common.ResponseWriter, r common.Request, params ma
 
 // parseOptionsFromHeaders is now implemented in headers.go
 
-func (h *Handler) handleRead(ctx context.Context, w common.ResponseWriter, schema, entity, id string, options ExtendedRequestOptions) {
-	logger.Info("Reading records from %s.%s", schema, entity)
+func (h *Handler) handleRead(ctx context.Context, w common.ResponseWriter, id string, options ExtendedRequestOptions) {
+	// Capture panics and return error response
+	defer func() {
+		if err := recover(); err != nil {
+			h.handlePanic(w, "handleRead", err)
+		}
+	}()
 
-	model, err := h.registry.GetModelByEntity(schema, entity)
-	if err != nil {
-		logger.Error("Invalid entity: %v", err)
-		h.sendError(w, http.StatusBadRequest, "invalid_entity", "Invalid entity", err)
+	schema := GetSchema(ctx)
+	entity := GetEntity(ctx)
+	tableName := GetTableName(ctx)
+	model := GetModel(ctx)
+
+	// Validate and unwrap model type to get base struct
+	modelType := reflect.TypeOf(model)
+	for modelType != nil && (modelType.Kind() == reflect.Ptr || modelType.Kind() == reflect.Slice || modelType.Kind() == reflect.Array) {
+		modelType = modelType.Elem()
+	}
+
+	if modelType == nil || modelType.Kind() != reflect.Struct {
+		logger.Error("Model must be a struct type, got %v for %s.%s", modelType, schema, entity)
+		h.sendError(w, http.StatusInternalServerError, "invalid_model", "Model must be a struct type", fmt.Errorf("invalid model type: %v", modelType))
 		return
 	}
 
-	query := h.db.NewSelect().Model(model)
+	// Create a pointer to a slice of pointers to the model type for query results
+	modelPtr := reflect.New(reflect.SliceOf(reflect.PointerTo(modelType))).Interface()
 
-	// Get table name
-	tableName := h.getTableName(schema, entity, model)
+	logger.Info("Reading records from %s.%s", schema, entity)
+
+	query := h.db.NewSelect().Model(modelPtr)
 	query = query.Table(tableName)
 
 	// Apply column selection
@@ -214,9 +287,8 @@ func (h *Handler) handleRead(ctx context.Context, w common.ResponseWriter, schem
 		query = query.Offset(*options.Offset)
 	}
 
-	// Execute query
-	resultSlice := reflect.New(reflect.SliceOf(reflect.TypeOf(model))).Interface()
-	if err := query.Scan(ctx, resultSlice); err != nil {
+	// Execute query - modelPtr was already created earlier
+	if err := query.Scan(ctx, modelPtr); err != nil {
 		logger.Error("Error executing query: %v", err)
 		h.sendError(w, http.StatusInternalServerError, "query_error", "Error executing query", err)
 		return
@@ -238,21 +310,24 @@ func (h *Handler) handleRead(ctx context.Context, w common.ResponseWriter, schem
 		Offset:   offset,
 	}
 
-	h.sendFormattedResponse(w, resultSlice, metadata, options)
+	h.sendFormattedResponse(w, modelPtr, metadata, options)
 }
 
-func (h *Handler) handleCreate(ctx context.Context, w common.ResponseWriter, schema, entity string, data interface{}, options ExtendedRequestOptions) {
+func (h *Handler) handleCreate(ctx context.Context, w common.ResponseWriter, data interface{}, options ExtendedRequestOptions) {
+	// Capture panics and return error response
+	defer func() {
+		if err := recover(); err != nil {
+			h.handlePanic(w, "handleCreate", err)
+		}
+	}()
+
+	schema := GetSchema(ctx)
+	entity := GetEntity(ctx)
+	tableName := GetTableName(ctx)
+	model := GetModel(ctx)
+
 	logger.Info("Creating record in %s.%s", schema, entity)
 
-	model, err := h.registry.GetModelByEntity(schema, entity)
-	if err != nil {
-		logger.Error("Invalid entity: %v", err)
-		h.sendError(w, http.StatusBadRequest, "invalid_entity", "Invalid entity", err)
-		return
-	}
-
-	tableName := h.getTableName(schema, entity, model)
-
 	// Handle batch creation
 	dataValue := reflect.ValueOf(data)
 	if dataValue.Kind() == reflect.Slice || dataValue.Kind() == reflect.Array {
@@ -263,8 +338,8 @@ func (h *Handler) handleCreate(ctx context.Context, w common.ResponseWriter, sch
 			for i := 0; i < dataValue.Len(); i++ {
 				item := dataValue.Index(i).Interface()
 
-				// Convert item to model type
-				modelValue := reflect.New(reflect.TypeOf(model).Elem()).Interface()
+				// Convert item to model type - create a pointer to the model
+				modelValue := reflect.New(reflect.TypeOf(model)).Interface()
 				jsonData, err := json.Marshal(item)
 				if err != nil {
 					return fmt.Errorf("failed to marshal item: %w", err)
@@ -291,8 +366,8 @@ func (h *Handler) handleCreate(ctx context.Context, w common.ResponseWriter, sch
 		return
 	}
 
-	// Single record creation
-	modelValue := reflect.New(reflect.TypeOf(model).Elem()).Interface()
+	// Single record creation - create a pointer to the model
+	modelValue := reflect.New(reflect.TypeOf(model)).Interface()
 	jsonData, err := json.Marshal(data)
 	if err != nil {
 		logger.Error("Error marshaling data: %v", err)
@@ -315,18 +390,20 @@ func (h *Handler) handleCreate(ctx context.Context, w common.ResponseWriter, sch
 	h.sendResponse(w, modelValue, nil)
 }
 
-func (h *Handler) handleUpdate(ctx context.Context, w common.ResponseWriter, schema, entity, id string, idPtr *int64, data interface{}, options ExtendedRequestOptions) {
+func (h *Handler) handleUpdate(ctx context.Context, w common.ResponseWriter, id string, idPtr *int64, data interface{}, options ExtendedRequestOptions) {
+	// Capture panics and return error response
+	defer func() {
+		if err := recover(); err != nil {
+			h.handlePanic(w, "handleUpdate", err)
+		}
+	}()
+
+	schema := GetSchema(ctx)
+	entity := GetEntity(ctx)
+	tableName := GetTableName(ctx)
+
 	logger.Info("Updating record in %s.%s", schema, entity)
 
-	model, err := h.registry.GetModelByEntity(schema, entity)
-	if err != nil {
-		logger.Error("Invalid entity: %v", err)
-		h.sendError(w, http.StatusBadRequest, "invalid_entity", "Invalid entity", err)
-		return
-	}
-
-	tableName := h.getTableName(schema, entity, model)
-
 	// Convert data to map
 	dataMap, ok := data.(map[string]interface{})
 	if !ok {
@@ -367,18 +444,20 @@ func (h *Handler) handleUpdate(ctx context.Context, w common.ResponseWriter, sch
 	}, nil)
 }
 
-func (h *Handler) handleDelete(ctx context.Context, w common.ResponseWriter, schema, entity, id string) {
+func (h *Handler) handleDelete(ctx context.Context, w common.ResponseWriter, id string) {
+	// Capture panics and return error response
+	defer func() {
+		if err := recover(); err != nil {
+			h.handlePanic(w, "handleDelete", err)
+		}
+	}()
+
+	schema := GetSchema(ctx)
+	entity := GetEntity(ctx)
+	tableName := GetTableName(ctx)
+
 	logger.Info("Deleting record from %s.%s", schema, entity)
 
-	model, err := h.registry.GetModelByEntity(schema, entity)
-	if err != nil {
-		logger.Error("Invalid entity: %v", err)
-		h.sendError(w, http.StatusBadRequest, "invalid_entity", "Invalid entity", err)
-		return
-	}
-
-	tableName := h.getTableName(schema, entity, model)
-
 	query := h.db.NewDelete().Table(tableName)
 
 	if id == "" {
@@ -470,10 +549,22 @@ func (h *Handler) getTableName(schema, entity string, model interface{}) string
 
 func (h *Handler) generateMetadata(schema, entity string, model interface{}) *common.TableMetadata {
 	modelType := reflect.TypeOf(model)
-	if modelType.Kind() == reflect.Ptr {
+
+	// Unwrap pointers, slices, and arrays to get to the base struct type
+	for modelType.Kind() == reflect.Ptr || modelType.Kind() == reflect.Slice || modelType.Kind() == reflect.Array {
 		modelType = modelType.Elem()
 	}
 
+	// Validate that we have a struct type
+	if modelType.Kind() != reflect.Struct {
+		logger.Error("Model type must be a struct, got %s for %s.%s", modelType.Kind(), schema, entity)
+		return &common.TableMetadata{
+			Schema:  schema,
+			Table:   h.getTableName(schema, entity, model),
+			Columns: []common.Column{},
+		}
+	}
+
 	tableName := h.getTableName(schema, entity, model)
 
 	metadata := &common.TableMetadata{

pkg/restheadspec/restheadspec.go

@@ -1,3 +1,55 @@
+// Package restheadspec provides the Rest Header Spec API framework.
+//
+// Rest Header Spec (restheadspec) is a RESTful API framework that reads query options,
+// filters, sorting, pagination, and other parameters from HTTP headers instead of
+// request bodies or query parameters. This approach provides a clean separation between
+// data and metadata in API requests.
+//
+// # Key Features
+//
+//   - Header-based API configuration: All query options are passed via HTTP headers
+//   - Database-agnostic: Works with both GORM and Bun ORM through adapters
+//   - Router-agnostic: Supports multiple HTTP routers (Mux, BunRouter, etc.)
+//   - Advanced filtering: Supports complex filter operations (eq, gt, lt, like, between, etc.)
+//   - Pagination and sorting: Built-in support for limit, offset, and multi-column sorting
+//   - Preloading and expansion: Support for eager loading relationships
+//   - Multiple response formats: Default, simple, and Syncfusion formats
+//
+// # HTTP Headers
+//
+// The following headers are supported for configuring API requests:
+//
+//   - X-Filters: JSON array of filter conditions
+//   - X-Columns: Comma-separated list of columns to select
+//   - X-Sort: JSON array of sort specifications
+//   - X-Limit: Maximum number of records to return
+//   - X-Offset: Number of records to skip
+//   - X-Preload: Comma-separated list of relations to preload
+//   - X-Expand: Comma-separated list of relations to expand (LEFT JOIN)
+//   - X-Distinct: Boolean to enable DISTINCT queries
+//   - X-Skip-Count: Boolean to skip total count query
+//   - X-Response-Format: Response format (detail, simple, syncfusion)
+//   - X-Clean-JSON: Boolean to remove null/empty fields
+//   - X-Custom-SQL-Where: Custom SQL WHERE clause (AND)
+//   - X-Custom-SQL-Or: Custom SQL WHERE clause (OR)
+//
+// # Usage Example
+//
+//	// Create a handler with GORM
+//	handler := restheadspec.NewHandlerWithGORM(db)
+//
+//	// Register models
+//	handler.Registry.RegisterModel("users", User{})
+//
+//	// Setup routes with Mux
+//	muxRouter := mux.NewRouter()
+//	restheadspec.SetupMuxRoutes(muxRouter, handler)
+//
+//	// Make a request with headers
+//	// GET /public/users
+//	// X-Filters: [{"column":"age","operator":"gt","value":18}]
+//	// X-Sort: [{"column":"name","direction":"asc"}]
+//	// X-Limit: 10
 package restheadspec
 
 import (