/**
  * Remove the specified resource from storage.
  *
  * @param  int  $id
  * @return \Illuminate\Http\Response
  */
 public function destroy($id)
 {
     DB::transaction(function () use($id) {
         $user = Auth::user();
         $product_type = Product_type::findOrFail($id);
         $product_type->updated_by = $user->name;
         $product_type->deleted_by = $user->name;
         $product_type->key = $product_type->key . '-' . microtime(true);
         $product_type->save();
         // soft delete
         $product_type->delete();
     });
 }