* finish task#1323.

module/user/model.php

@@ -317,7 +317,7 @@ class userModel extends model
         $user = fixer::input('post')
             ->setDefault('join', '0000-00-00')
             ->setIF($this->post->password1 != false, 'password', md5($this->post->password1))
-            ->remove('password1, password2, groups')
+            ->remove('password1, password2')
             ->specialChars('msn,qq,yahoo,gtalk,wangwang,mobile,phone,address,zipcode')
             ->get();
 
@@ -341,17 +341,6 @@ class userModel extends model
                 if(!dao::isError()) $this->app->user->account = $this->post->account;
             }
         }
-
-        $this->dao->delete()->from(TABLE_USERGROUP)->where('account')->eq($this->post->account)->exec();
-        if($this->post->groups)
-        {
-            foreach($this->post->groups as $groupID)
-            {
-                $data->account = $this->post->account;
-                $data->group   = $groupID;
-                $this->dao->insert(TABLE_USERGROUP)->data($data)->exec();
-            }
-        }
     }
 
     /**
@@ -405,6 +394,27 @@ class userModel extends model
         }
     }
 
+    /**
+     * Update user's group. 
+     * 
+     * @param  string    $account 
+     * @access public
+     * @return void
+     */
+    public function updateGroup($account)
+    {
+        $this->dao->delete()->from(TABLE_USERGROUP)->where('account')->eq($account)->exec();
+        if($this->post->groups)
+        {
+            foreach($this->post->groups as $groupID)
+            {
+                $data->account = $account;
+                $data->group   = $groupID;
+                $this->dao->insert(TABLE_USERGROUP)->data($data)->exec();
+            }
+        }
+    }
+
     /**
      * Update password 
      *