refactor: translatorError flag added for backward compatibility (#6178)

Co-authored-by: Saeid Saeidee <s.saeidee@sensysgatso.com>

gorm.go

@@ -47,6 +47,8 @@ type Config struct {
 	QueryFields bool
 	// CreateBatchSize default create batch size
 	CreateBatchSize int
+	// TranslateError enabling error translation
+	TranslateError bool
 
 	// ClauseBuilders clause builder
 	ClauseBuilders map[string]clause.ClauseBuilder
@@ -348,8 +350,10 @@ func (db *DB) Callback() *callbacks {
 // AddError add error to db
 func (db *DB) AddError(err error) error {
 	if err != nil {
-		if errTranslator, ok := db.Dialector.(ErrorTranslator); ok {
+		if db.Config.TranslateError {
-			err = errTranslator.Translate(err)
+			if errTranslator, ok := db.Dialector.(ErrorTranslator); ok {
+				err = errTranslator.Translate(err)
+			}
 		}
 
 		if db.Error == nil {

tests/error_translator_test.go

@@ -9,10 +9,20 @@ import (
 )
 
 func TestDialectorWithErrorTranslatorSupport(t *testing.T) {
+	// it shouldn't translate error when the TranslateError flag is false
 	translatedErr := errors.New("translated error")
+	untranslatedErr := errors.New("some random error")
 	db, _ := gorm.Open(tests.DummyDialector{TranslatedErr: translatedErr})
 
-	err := db.AddError(errors.New("some random error"))
+	err := db.AddError(untranslatedErr)
+	if errors.Is(err, translatedErr) {
+		t.Fatalf("expected err: %v got err: %v", translatedErr, err)
+	}
+
+	// it should translate error when the TranslateError flag is true
+	db, _ = gorm.Open(tests.DummyDialector{TranslatedErr: translatedErr}, &gorm.Config{TranslateError: true})
+
+	err = db.AddError(untranslatedErr)
 	if !errors.Is(err, translatedErr) {
 		t.Fatalf("expected err: %v got err: %v", translatedErr, err)
 	}