diff --git a/do.go b/do.go
index 8f3b0213..168a3f21 100644
--- a/do.go
+++ b/do.go
@@ -114,6 +114,12 @@ func (s *Do) prepareCreateSql() {
 	return
 }
 
+func (s *Do) saveAssociation(typ string) {
+	if typ == "before" {
+	} else if typ == "after" {
+	}
+}
+
 func (s *Do) create() {
 	s.err(s.model.callMethod("BeforeCreate"))
 	s.err(s.model.callMethod("BeforeSave"))
@@ -154,7 +160,7 @@ func (s *Do) setUpdateAttrs(values interface{}, ignore_protected_attrs ...bool)
 		}
 	case interface{}:
 		m := &Model{data: values, driver: s.driver}
-		fields := m.columnsHasValue("")
+		fields := m.columnsHasValue("other")
 
 		s.updateAttrs = make(map[string]interface{}, len(fields))
 		for _, field := range fields {
@@ -401,7 +407,7 @@ func (s *Do) buildWhereCondition(clause map[string]interface{}) (str string) {
 	case interface{}:
 		m := &Model{data: query, driver: s.driver}
 		var sqls []string
-		for _, field := range m.columnsHasValue("") {
+		for _, field := range m.columnsHasValue("other") {
 			sqls = append(sqls, fmt.Sprintf(" ( %v = %v ) ", field.DbName, s.addToVars(field.Value)))
 		}
 		return strings.Join(sqls, " AND ")
@@ -459,7 +465,7 @@ func (s *Do) buildNotCondition(clause map[string]interface{}) (str string) {
 	case interface{}:
 		m := &Model{data: query, driver: s.driver}
 		var sqls []string
-		for _, field := range m.columnsHasValue("") {
+		for _, field := range m.columnsHasValue("other") {
 			sqls = append(sqls, fmt.Sprintf(" ( %v <> %v ) ", field.DbName, s.addToVars(field.Value)))
 		}
 		return strings.Join(sqls, " AND ")
@@ -565,7 +571,7 @@ func (s *Do) combinedSql() string {
 
 func (s *Do) createTable() *Do {
 	var sqls []string
-	for _, field := range s.model.fields("") {
+	for _, field := range s.model.fields("create") {
 		if len(field.SqlType) > 0 {
 			sqls = append(sqls, field.DbName+" "+field.SqlType)
 		}
@@ -602,7 +608,7 @@ func (s *Do) initializeWithSearchCondition() {
 				switch reflect.ValueOf(obj).Kind() {
 				case reflect.Struct:
 					m := &Model{data: obj, driver: s.driver}
-					for _, field := range m.columnsHasValue("") {
+					for _, field := range m.columnsHasValue("other") {
 						m.setValueByColumn(field.DbName, field.Value, s.value)
 					}
 				case reflect.Map:
@@ -613,7 +619,7 @@ func (s *Do) initializeWithSearchCondition() {
 			}
 		case interface{}:
 			m := &Model{data: query, driver: s.driver}
-			for _, field := range m.columnsHasValue("") {
+			for _, field := range m.columnsHasValue("other") {
 				m.setValueByColumn(field.DbName, field.Value, s.value)
 			}
 		}
diff --git a/gorm_test.go b/gorm_test.go
index e975a4ae..d3d5152b 100644
--- a/gorm_test.go
+++ b/gorm_test.go
@@ -1024,10 +1024,14 @@ func TestSubStruct(t *testing.T) {
 		Title:    "post 1",
 		Body:     "body 1",
 		Comments: []Comment{{Content: "Comment 1"}, {Content: "Comment 2"}},
-		Category: Category{Name: "category"},
+		Category: Category{Name: "Category 1"},
 	}
 
 	if err := db.Save(&post).Error; err != nil {
 		t.Errorf("Got errors when save post", err)
 	}
+
+	if db.First(&Category{}, "name = ?", "Category 1").Error != nil {
+		t.Errorf("Category should be saved")
+	}
 }
diff --git a/model.go b/model.go
index 17f80388..fb30bd8e 100644
--- a/model.go
+++ b/model.go
@@ -11,8 +11,9 @@ import (
 )
 
 type Model struct {
-	data   interface{}
-	driver string
+	data          interface{}
+	driver        string
+	_cache_fields map[string][]Field
 }
 
 type Field struct {
@@ -64,6 +65,10 @@ func (m *Model) primaryKeyDb() string {
 }
 
 func (m *Model) fields(operation string) (fields []Field) {
+	if len(m._cache_fields[operation]) > 0 {
+		return
+	}
+
 	indirect_value := reflect.Indirect(reflect.ValueOf(m.data))
 	typ := indirect_value.Type()
 
@@ -121,8 +126,12 @@ func (m *Model) fields(operation string) (fields []Field) {
 			fields = append(fields, field)
 		}
 	}
-	return
 
+	if len(m._cache_fields) == 0 {
+		m._cache_fields = make(map[string][]Field)
+	}
+	m._cache_fields[operation] = fields
+	return
 }
 
 func (m *Model) columnsHasValue(operation string) (fields []Field) {