Add tag to support skip nested save for associations

association_test.go

@@ -884,3 +884,24 @@ func TestHasManyChildrenWithOneStruct(t *testing.T) {
 
 	DB.Save(&category)
 }
+
+func TestSkipSaveAssociation(t *testing.T) {
+	type Company struct {
+		gorm.Model
+		Name string
+	}
+
+	type User struct {
+		gorm.Model
+		Name      string
+		CompanyID uint
+		Company   Company `gorm:"save_associations:false"`
+	}
+	DB.AutoMigrate(&Company{}, &User{})
+
+	DB.Save(&User{Name: "jinzhu", Company: Company{Name: "skip_save_association"}})
+
+	if !DB.Where("name = ?", "skip_save_association").First(&Company{}).RecordNotFound() {
+		t.Errorf("Company skip_save_association should not been saved")
+	}
+}

callback_save.go

@@ -10,13 +10,23 @@ func commitOrRollbackTransactionCallback(scope *Scope) {
 	scope.CommitOrRollback()
 }
 
+func saveFieldAsAssociation(scope *Scope, field *Field) (bool, *Relationship) {
+	if scope.changeableField(field) && !field.IsBlank && !field.IsIgnored {
+		if value, ok := field.TagSettings["SAVE_ASSOCIATIONS"]; !ok || (value != "false" && value != "skip") {
+			if relationship := field.Relationship; relationship != nil {
+				return true, relationship
+			}
+		}
+	}
+	return false, nil
+}
+
 func saveBeforeAssociationsCallback(scope *Scope) {
 	if !scope.shouldSaveAssociations() {
 		return
 	}
 	for _, field := range scope.Fields() {
-		if scope.changeableField(field) && !field.IsBlank && !field.IsIgnored {
-			if relationship := field.Relationship; relationship != nil && relationship.Kind == "belongs_to" {
+		if ok, relationship := saveFieldAsAssociation(scope, field); ok && relationship.Kind == "belongs_to" {
 			fieldValue := field.Field.Addr().Interface()
 			scope.Err(scope.NewDB().Save(fieldValue).Error)
 			if len(relationship.ForeignFieldNames) != 0 {
@@ -30,7 +40,6 @@ func saveBeforeAssociationsCallback(scope *Scope) {
 			}
 		}
 	}
-	}
 }
 
 func saveAfterAssociationsCallback(scope *Scope) {
@@ -38,8 +47,7 @@ func saveAfterAssociationsCallback(scope *Scope) {
 		return
 	}
 	for _, field := range scope.Fields() {
-		if scope.changeableField(field) && !field.IsBlank && !field.IsIgnored {
-			if relationship := field.Relationship; relationship != nil &&
+		if ok, relationship := saveFieldAsAssociation(scope, field); ok &&
 			(relationship.Kind == "has_one" || relationship.Kind == "has_many" || relationship.Kind == "many_to_many") {
 			value := field.Field
 
@@ -88,5 +96,4 @@ func saveAfterAssociationsCallback(scope *Scope) {
 			}
 		}
 	}
-	}
 }

scope.go

@@ -964,9 +964,14 @@ func (scope *Scope) changeableField(field *Field) bool {
 }
 
 func (scope *Scope) shouldSaveAssociations() bool {
-	if saveAssociations, ok := scope.Get("gorm:save_associations"); ok && !saveAssociations.(bool) {
+	if saveAssociations, ok := scope.Get("gorm:save_associations"); ok {
+		if v, ok := saveAssociations.(bool); ok && !v {
 			return false
 		}
+		if v, ok := saveAssociations.(string); ok && (v != "skip") {
+			return false
+		}
+	}
 	return true && !scope.HasError()
 }