Edit DB.clone(), DB.Dialect(), and Scope.Dialect() preserve transactions.

main.go

@@ -119,7 +119,7 @@ func (s *DB) CommonDB() SQLCommon {
 
 // Dialect get dialect
 func (s *DB) Dialect() Dialect {
-	return s.parent.dialect
+	return s.dialect
 }
 
 // Callback return `Callbacks` container, you could add/change/delete callbacks with it
@@ -484,6 +484,8 @@ func (s *DB) Begin() *DB {
 	if db, ok := c.db.(sqlDb); ok && db != nil {
 		tx, err := db.Begin()
 		c.db = interface{}(tx).(SQLCommon)
+
+		c.dialect.SetDB(c.db)
 		c.AddError(err)
 	} else {
 		c.AddError(ErrCantStartTransaction)
@@ -748,6 +750,7 @@ func (s *DB) clone() *DB {
 		Value:             s.Value,
 		Error:             s.Error,
 		blockGlobalUpdate: s.blockGlobalUpdate,
+		dialect:           newDialect(s.dialect.GetName(), s.db),
 	}
 
 	for key, value := range s.values {

scope.go

@@ -63,7 +63,7 @@ func (scope *Scope) SQLDB() SQLCommon {
 
 // Dialect get dialect
 func (scope *Scope) Dialect() Dialect {
-	return scope.db.parent.dialect
+	return scope.db.dialect
 }
 
 // Quote used to quote string to escape them for database