Support specify GORM tag setting inside scanner

migration_test.go

@@ -117,7 +117,7 @@ type Company struct {
 }
 
 type Role struct {
-	Name string
+	Name string `gorm:"size:256"`
 }
 
 func (role *Role) Scan(value interface{}) error {

model_struct.go

@@ -188,6 +188,13 @@ func (scope *Scope) GetModelStruct() *ModelStruct {
 				if _, isScanner := fieldValue.(sql.Scanner); isScanner {
 					// is scanner
 					field.IsScanner, field.IsNormal = true, true
+					if indirectType.Kind() == reflect.Struct {
+						for i := 0; i < indirectType.NumField(); i++ {
+							for key, value := range parseTagSetting(indirectType.Field(i).Tag) {
+								field.TagSettings[key] = value
+							}
+						}
+					}
 				} else if _, isTime := fieldValue.(*time.Time); isTime {
 					// is time
 					field.IsNormal = true