diff --git a/db/category.go b/db/category.go
index d29eac8..fe3a582 100644
--- a/db/category.go
+++ b/db/category.go
@@ -39,9 +39,6 @@ var (
 )
 
 func (c *Category) BeforeSave(tx *gorm.DB) error {
-	if c.ParentID == c.ID {
-		return ERROR_CATEGORY_SELF_REFERENCING
-	}
 	if c.ParentID != 0 {
 		var parent Category
 		if err := tx.Find(&parent, c.ParentID).Error; err != nil {
@@ -63,3 +60,10 @@ func (c *Category) BeforeSave(tx *gorm.DB) error {
 	}
 	return nil
 }
+
+func (c *Category) AfterCreate(tx *gorm.DB) error {
+	if c.ParentID == c.ID {
+		return ERROR_CATEGORY_SELF_REFERENCING
+	}
+	return nil
+}