/**
  * Remove the specified resource from storage.
  *
  * @param  int  $id
  * @return Response
  */
 public function destroy(DataValue $dataValue)
 {
     //delete itself
     $dataValue->delete();
     Cache::flush();
     return redirect()->route('variables.show', $dataValue->fk_var_id)->with('message', 'Value deleted.');
 }