fix map fields with clickhouse driver

Author: jinzhu

schema/schema.go

@@ -338,7 +338,7 @@ func ParseWithSpecialTableName(dest interface{}, cacheStore *sync.Map, namer Nam
 
 	if _, embedded := schema.cacheStore.Load(embeddedCacheKey); !embedded {
 		for _, field := range schema.Fields {
-			if field.DataType == "" && (field.Creatable || field.Updatable || field.Readable) {
+			if field.DataType == "" && field.GORMDataType == "" && (field.Creatable || field.Updatable || field.Readable) {
 				if schema.parseRelation(field); schema.err != nil {
 					return schema, schema.err
 				} else {

schema/schema_test.go

@@ -19,6 +19,22 @@ func TestParseSchema(t *testing.T) {
 	checkUserSchema(t, user)
 }
 
+func TestParseSchemaWithMap(t *testing.T) {
+	type User struct {
+		tests.User
+		Attrs map[string]string `gorm:"type:Map(String,String);"`
+	}
+
+	user, err := schema.Parse(&User{}, &sync.Map{}, schema.NamingStrategy{})
+	if err != nil {
+		t.Fatalf("failed to parse user with map, got error %v", err)
+	}
+
+	if field := user.FieldsByName["Attrs"]; field.DataType != "Map(String,String)" {
+		t.Errorf("failed to parse user field Attrs")
+	}
+}
+
 func TestParseSchemaWithPointerFields(t *testing.T) {
 	user, err := schema.Parse(&User{}, &sync.Map{}, schema.NamingStrategy{})
 	if err != nil {