/**
  * Remove the specified categroy from database.
  *
  * @param  int  $id
  * @return Response
  */
 public function destroy($id)
 {
     $supplier = Suppliers::find($id);
     $check = new Suppliers();
     $error = "You can not delete this supplier because some products depend on it";
     if ($check->exists($id) == true) {
         return Redirect::to('suppliers')->with('error', $error);
     } else {
         $supplier->delete();
     }
     // redirect
     return Redirect::to('suppliers');
 }