hi , here im trying to use generatetreelist() first time,  so whats
problem im facing is that it saves the data two times with once
execution of code.

 here is my code that im using

        function addData($fieldName = null, $pa_id = null){

                $existance = $this->Category->findByName($fieldName);
                if($existance){
                $this->set('error','This name already exists.');
                }else{
                        $data['Category']['parent_id'] = 3;
                        $data['Category']['name'] = $fieldName ;
                        if($this->Category->save($data)){
                            exit;
                        }
                }
        }//addData


result in the database

       id   parent_id     lft      rght     name
------------------------------------------------------------
      48        3           34       35       bari      ----------->
only this result should be saved here

      47        3        NULL    NULL    bari   ---------------> this
is unexpected ( problem )

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