/**
  * Update the specified resource in storage.
  *
  * @param  \Illuminate\Http\Request  $request
  * @param  int  $id
  * @return \Illuminate\Http\Response
  */
 public function update(Request $request, $id)
 {
     $this->validate($request, ['name' => 'required', 'description' => 'required|min:6']);
     Material_type::findOrFail($id)->update($request->all());
     return redirect()->route('admin.element.type.index')->withFlashSuccess(trans("element_backend.element_material_update"));
 }