Fix mysql tests

callbacks/preload.go

@@ -101,7 +101,11 @@ func preload(db *gorm.DB, rels []*schema.Relationship, conds []interface{}) {
 		}
 
 		for _, data := range identityMap[utils.ToStringKey(fieldValues...)] {
-			reflectFieldValue := reflect.Indirect(rel.Field.ReflectValueOf(data))
+			reflectFieldValue := rel.Field.ReflectValueOf(data)
+			if reflectFieldValue.Kind() == reflect.Ptr && reflectFieldValue.IsNil() {
+				reflectFieldValue.Set(reflect.New(rel.Field.FieldType.Elem()))
+			}
+			reflectFieldValue = reflect.Indirect(reflectFieldValue)
 			switch reflectFieldValue.Kind() {
 			case reflect.Struct:
 				rel.Field.Set(data, reflectResults.Index(i).Interface())

logger/logger.go

@@ -78,7 +78,7 @@ func New(writer Writer, config Config) Interface {
 		traceErrStr = RedBold + "%s " + MagentaBold + "%s\n" + Reset + Yellow + "[%.3fms] " + Blue + "[rows:%d]" + Reset + " %s"
 	}
 
-	return logger{
+	return &logger{
 		Writer:       writer,
 		Config:       config,
 		infoStr:      infoStr,
@@ -98,7 +98,7 @@ type logger struct {
 }
 
 // LogMode log mode
-func (l logger) LogMode(level LogLevel) Interface {
+func (l *logger) LogMode(level LogLevel) Interface {
 	l.LogLevel = level
 	return l
 }

scan.go

@@ -87,6 +87,10 @@ func Scan(rows *sql.Rows, db *DB, initialized bool) {
 						values[idx] = field.ReflectValueOf(elem).Addr().Interface()
 					} else if joinFields[idx][0] != nil {
 						relValue := joinFields[idx][0].ReflectValueOf(elem)
+						if relValue.Kind() == reflect.Ptr && relValue.IsNil() {
+							relValue.Set(reflect.New(relValue.Type().Elem()))
+						}
+
 						values[idx] = joinFields[idx][1].ReflectValueOf(relValue).Addr().Interface()
 					}
 				}
@@ -110,6 +114,10 @@ func Scan(rows *sql.Rows, db *DB, initialized bool) {
 					if rel, ok := db.Statement.Schema.Relationships.Relations[names[0]]; ok {
 						relValue := rel.Field.ReflectValueOf(db.Statement.ReflectValue)
 						if field := rel.FieldSchema.LookUpField(strings.Join(names[1:], "__")); field != nil && field.Readable {
+							if relValue.Kind() == reflect.Ptr && relValue.IsNil() {
+								relValue.Set(reflect.New(relValue.Type().Elem()))
+							}
+
 							values[idx] = field.ReflectValueOf(relValue).Addr().Interface()
 							continue
 						}

schema/field.go

@@ -353,9 +353,6 @@ func (field *Field) setupValuerAndSetter() {
 		if field.FieldType.Kind() == reflect.Ptr {
 			field.ReflectValueOf = func(value reflect.Value) reflect.Value {
 				fieldValue := reflect.Indirect(value).Field(field.StructField.Index[0])
-				if fieldValue.IsNil() {
-					fieldValue.Set(reflect.New(field.FieldType.Elem()))
-				}
 				return fieldValue
 			}
 		} else {
@@ -406,7 +403,14 @@ func (field *Field) setupValuerAndSetter() {
 					return setter(value, v)
 				}
 			} else if field.FieldType.Kind() == reflect.Ptr && reflectV.Type().ConvertibleTo(field.FieldType.Elem()) {
-				field.ReflectValueOf(value).Elem().Set(reflectV.Convert(field.FieldType.Elem()))
+				fieldValue := field.ReflectValueOf(value)
+				if fieldValue.IsNil() {
+					if v == nil {
+						return nil
+					}
+					fieldValue.Set(reflect.New(field.FieldType.Elem()))
+				}
+				fieldValue.Elem().Set(reflectV.Convert(field.FieldType.Elem()))
 			} else if reflectV.Kind() == reflect.Ptr {
 				return field.Set(value, reflectV.Elem().Interface())
 			} else {
@@ -607,12 +611,26 @@ func (field *Field) setupValuerAndSetter() {
 			field.Set = func(value reflect.Value, v interface{}) error {
 				switch data := v.(type) {
 				case time.Time:
-					field.ReflectValueOf(value).Elem().Set(reflect.ValueOf(v))
+					fieldValue := field.ReflectValueOf(value)
+					if fieldValue.IsNil() {
+						if v == nil {
+							return nil
+						}
+						fieldValue.Set(reflect.New(field.FieldType.Elem()))
+					}
+					fieldValue.Elem().Set(reflect.ValueOf(v))
 				case *time.Time:
 					field.ReflectValueOf(value).Set(reflect.ValueOf(v))
 				case string:
 					if t, err := now.Parse(data); err == nil {
-						field.ReflectValueOf(value).Elem().Set(reflect.ValueOf(t))
+						fieldValue := field.ReflectValueOf(value)
+						if fieldValue.IsNil() {
+							if v == "" {
+								return nil
+							}
+							fieldValue.Set(reflect.New(field.FieldType.Elem()))
+						}
+						fieldValue.Elem().Set(reflect.ValueOf(t))
 					} else {
 						return fmt.Errorf("failed to set string %v to time.Time field %v, failed to parse it as time, got error %v", v, field.Name, err)
 					}
@@ -651,7 +669,14 @@ func (field *Field) setupValuerAndSetter() {
 						if reflectV.Type().ConvertibleTo(field.FieldType) {
 							field.ReflectValueOf(value).Set(reflectV.Convert(field.FieldType))
 						} else if reflectV.Type().ConvertibleTo(field.FieldType.Elem()) {
-							field.ReflectValueOf(value).Elem().Set(reflectV.Convert(field.FieldType.Elem()))
+							fieldValue := field.ReflectValueOf(value)
+							if fieldValue.IsNil() {
+								if v == nil {
+									return nil
+								}
+								fieldValue.Set(reflect.New(field.FieldType.Elem()))
+							}
+							fieldValue.Elem().Set(reflectV.Convert(field.FieldType.Elem()))
 						} else if valuer, ok := v.(driver.Valuer); ok {
 							if v, err = valuer.Value(); err == nil {
 								err = field.ReflectValueOf(value).Interface().(sql.Scanner).Scan(v)