Laravel - 如何获取外键并将其传递给控制器

Question

我正在创建一个调查，为了创建一个问题，我需要从调查表中获取survey_id并在其中放置一个在表单中的隐藏字段中创建问题视图并将其传递给问题控制器。

Answer 1

Since you passe survey_id all you need to the do is use the right model (Question) in the store method, everything else same correct.

 /**
     * Store a newly created resource in storage.
     *
     * @param  \Illuminate\Http\Request  $request
     * @return \Illuminate\Http\Response
     */
    public function store(Request $request)
    {

      $input = $request->all();
      Question::create($input); //<==== You need to use Question insteed of Survey
      return redirect('survey');
    }

Answer 2

You can try below code,i hope this is help you:

$input = $request->all();
$survey = new Survey ();
$survey ->fill($input)->save();
if (isset($input['survey_id']) && !empty($input['survey_id'])) {
            $survey_id= $input['survey_id'];

            foreach ($survey_id as $index => $value) {
                Question::create([
                    'survey_id' => $survey ->id,
                    'title' => $value
                ]);
            }
        }

Answer 3

@Rachid's comments is right, but its not the reason of the error...

The problem is the resource's route -> controler@action mapping doesn't include any param for the /create route as we can see bellow...

... and your QuestionController::create function needs the param $id .

//...
class QuestionController extends Controller
{
    /**
     * Show the form for creating a new resource.
     *
     * @return \Illuminate\Http\Response
     */
    public function create($id) // <---- Right here...
//...

So, to bind your foreign key to this resource i'll need to do something like this...

Route::resource('survey.question', 'QuestionController');

This way you'll have your routes mapped sothing like this...

GET /survey/{survey}/question           survey.question.index
GET /survey/{survey}/question/create    survey.question.create

Then change your template, from:

{!! Form::open(array('action' => 'QuestionController@store', 'id' => 'Question')) !!}

To:

{!! Form::open(array('action' => 'QuestionController@store', 'id' => 'Question'), ['survey' => Request::route('survey')]) !!}

Then you can use your QuestionController::create function like this...

public function create(Survey $survey)
{
    return view('question.create')->with('survey', $survey);
}

Answer 4

You can also use parameters in resourceful routes like this:

Route::resource('survey/{survey}/question', 'QuestionController');

Then in your controller you can use:

class QuestionController extends Controller
{
    // ...

    /**
     * Show the form for creating a new resource.
     *
     * @return \Illuminate\Http\Response
     */
    public function create($id)
    {
        // $id will be the {survey} id from the route parameter.
    }

    // ...
}

You could as well use route model binding to avoid the manual Survey retrival in the controller:

use App\Survey;

class QuestionController extends Controller
{
    // ...

    /**
     * Show the form for creating a new resource.
     *
     * @return \Illuminate\Http\Response
     */
    public function create(Survey $survey)
    {
        return view('question.create', compact('survey'));
    }

    // ...
}

Remember to update the form action as well to include the pameter

Be Careful! If you register the parameter in the resource like I have shown, methods as show, edit, update and destroy (that accepts the id of the resource to act on in the url) will receive two route parameters, one will be the survey id , the second one would be the question id (your resource). Keep that in mind!