/**
  * Update the specified resource in storage.
  *
  * @param  int  $id
  * @return Response
  */
 public function update(Request $request, $id)
 {
     $purchaseOrder = PurchaseOrder::findOrFail($id);
     $purchaseOrder->fill($request->all());
     $purchaseOrder->save();
     Session::flash('message', $purchaseOrder->name . ' was updated !');
     return \Redirect::back();
 }