gistfile1.txt

public function deleteStepUser($outputFormat=null)
    {
        $this->before($outputFormat);
        $data = $this->convertInput($this->getDataSource());
        $this->checkData($data);
        $this->checkStep($data);
        $this->checkUser($data);

        $goalStepUser = GoalStepUser::findByDql('step_id = ? AND user_id = ?  AND team_id IS NULL', array($data['GoalStep']['id'], $data['User']['id']))->getFirst();

        if ($goalStepUser) {
            $goalStepUser->delete();
            return $this->output('User step successfully deleted');
        } else {
            return $this->output('User is not associated with this step', null, self::HTTP_BAD_REQUEST);
        }
    }