refactor: ♻️ change resolvspec types to build in sqltypes

pkg/writers/gorm/README.md

@@ -6,6 +6,8 @@ Generates Go source files with GORM model definitions from database schema infor
 
 The GORM Writer converts RelSpec's internal database model representation into Go source code with GORM struct definitions, complete with proper tags, relationships, and methods.
 
+With `--types sqltypes`, nullable fields use the [`pkg/sqltypes`](../../sqltypes/README.md) package.
+
 ## Features
 
 - Generates GORM-compatible Go structs
@@ -48,19 +50,19 @@ func main() {
 ### CLI Examples
 
 ```bash
-# Generate GORM models from a DBML schema (default: resolvespec types)
+# Generate GORM models from a DBML schema (default: baselib pointer types)
 relspec convert --from dbml --from-path schema.dbml \
   --to gorm --to-path models.go --package models
 
-# Use standard library database/sql nullable types instead of resolvespec
+# Use standard library database/sql nullable types instead
 relspec convert --from dbml --from-path schema.dbml \
   --to gorm --to-path models.go --package models \
   --types stdlib
 
-# Explicitly select resolvespec types (same as omitting --types)
+# Select sqltypes package types (git.warky.dev/wdevs/relspecgo/pkg/sqltypes)
 relspec convert --from pgsql --from-conn "postgres://localhost/mydb" \
   --to gorm --to-path models.go --package models \
-  --types resolvespec
+  --types sqltypes
 
 # Multi-file output (one file per table)
 relspec convert --from json --from-path schema.json \
@@ -89,13 +91,13 @@ Files are named: `sql_{schema}_{table}.go`
 
 ## Generated Code Examples
 
-### Default — resolvespec types (`--types resolvespec`)
+### sqltypes package types (`--types sqltypes`)
 
 ```go
 package models
 
 import (
-    sql_types "github.com/bitechdev/ResolveSpec/pkg/spectypes"
+    sql_types "git.warky.dev/wdevs/relspecgo/pkg/sqltypes"
 )
 
 type ModelUser struct {
@@ -141,11 +143,11 @@ func (ModelUser) TableName() string {
 Controls which Go package is used for nullable column types. Set via the `--types` CLI flag or `WriterOptions.NullableTypes`:
 
 ```go
-// Use resolvespec types (default — omit NullableTypes or set to "resolvespec")
+// Use sqltypes package types
 options := &writers.WriterOptions{
     OutputPath:    "models.go",
     PackageName:   "models",
-    NullableTypes: writers.NullableTypeResolveSpec,
+    NullableTypes: writers.NullableTypeSqlTypes,
 }
 
 // Use standard library database/sql types
@@ -176,7 +178,7 @@ options := &writers.WriterOptions{
 
 The nullable type package is selected with `--types` (or `WriterOptions.NullableTypes`).
 
-| SQL Type | NOT NULL — both | Nullable — resolvespec | Nullable — stdlib |
+| SQL Type | NOT NULL — both | Nullable — sqltypes | Nullable — stdlib |
 |---|---|---|---|
 | `bigint` | `int64` | `SqlInt64` | `sql.NullInt64` |
 | `integer` | `int32` | `SqlInt32` | `sql.NullInt32` |

pkg/writers/gorm/type_mapper.go

@@ -12,12 +12,12 @@ import (
 // TypeMapper handles type conversions between SQL and Go types
 type TypeMapper struct {
 	sqlTypesAlias string
-	typeStyle     string // writers.NullableTypeResolveSpec | writers.NullableTypeStdlib
+	typeStyle     string // writers.NullableTypeSqlTypes | writers.NullableTypeStdlib | writers.NullableTypeBaselib
 }
 
 // NewTypeMapper creates a new TypeMapper.
-// typeStyle should be writers.NullableTypeResolveSpec or writers.NullableTypeStdlib;
-// an empty string defaults to resolvespec.
+// typeStyle should be writers.NullableTypeSqlTypes, writers.NullableTypeStdlib, or
+// writers.NullableTypeBaselib; an empty string defaults to baselib.
 func NewTypeMapper(typeStyle string) *TypeMapper {
 	if typeStyle == "" {
 		typeStyle = writers.NullableTypeBaselib
@@ -50,7 +50,7 @@ func (tm *TypeMapper) SQLTypeToGoType(sqlType string, notNull bool) string {
 		return tm.baselibNullableGoType(baseType)
 	}
 
-	// resolvespec (default)
+	// sqltypes
 	if notNull {
 		return tm.baseGoType(baseType)
 	}
@@ -505,9 +505,9 @@ func (tm *TypeMapper) NeedsFmtImport(generateGetIDStr bool) bool {
 	return generateGetIDStr
 }
 
-// GetSQLTypesImport returns the import path for the spectypes package.
+// GetSQLTypesImport returns the import path for the sqltypes package.
 func (tm *TypeMapper) GetSQLTypesImport() string {
-	return "git.warky.dev/wdevs/relspecgo/pkg/spectypes"
+	return "git.warky.dev/wdevs/relspecgo/pkg/sqltypes"
 }
 
 // GetNullableTypeImportLine returns the full Go import line for the nullable type

pkg/writers/gorm/writer.go

@@ -77,7 +77,7 @@ func (w *Writer) writeSingleFile(db *models.Database) error {
 	packageName := w.getPackageName()
 	templateData := NewTemplateData(packageName, w.config)
 
-	// Add nullable types import (resolvespec or stdlib depending on options)
+	// Add nullable types import (sqltypes or stdlib depending on options)
 	templateData.AddImport(w.typeMapper.GetNullableTypeImportLine())
 
 	// Collect all models
@@ -171,7 +171,7 @@ func (w *Writer) writeMultiFile(db *models.Database) error {
 			// Create template data for this single table
 			templateData := NewTemplateData(packageName, w.config)
 
-			// Add nullable types import (resolvespec or stdlib depending on options)
+			// Add nullable types import (sqltypes or stdlib depending on options)
 			templateData.AddImport(w.typeMapper.GetNullableTypeImportLine())
 
 			// Create model data