Problem In Copy Data From First Model To 2Nd Model

i want to copy data after savning in one model to 2nd model

my code snippets as directed by some members but not working.

protected function afterSave() //Copy data from Client to packageassignment *** assuming your you're in the Client model 
                                                                //and Client has id,package_id,p_start_date
{
        $packageassignment= new Packageassignment();
        $packageassignment->user_id=$this->id;
        $packageassignment->package_id=$this->package_id;
        $packageassignment->package_start_date=$this->p_start_date;
        $packageassignment->save();
        return parent::afterSave();
}

plz update this code .

thanks