如何在Laravel 5.4中验证POST数据？

Question

I am testing an API in Laravel 5.4. I am now in the part of storing a record via API. I am having some issues on how to use Request::input() or Input::get() to validate POST data.

LessonsController.php

    <?php

    namespace App\Http\Controllers;

    use App\Http\Requests;
    use App\Lesson;
    use App\Acme\Transformers\LessonTransformer;
    //use Illuminate\Http\Request;
    use Illuminate\Support\Facades\Input;


use App\Http\Controllers\Controller;

class LessonsController extends ApiController
{

    /**
     * @var Acme\Transformers\LessonTransformer
     */
    protected $lessonTransformer;

    function __construct(LessonTransformer $lessonTransformer)
    {
        $this->lessonTransformer = $lessonTransformer;
       // $this->middleware('sentry.auth')->only('post'); // basic level of protection for creating a lession
    }


    /**
     * Show the form for creating a new resource.
     *
     * @return \Illuminate\Http\Response
     */
    public function create()
    {
        //
    }

    /**
     * Store a newly created resource in storage.
     * If we are using basic authentication, we should be using SSL
     *
     * @param  \Illuminate\Http\Request  $request
     * @return \Illuminate\Http\Response
     */
    public function store()
    {

        if( ! Input::get('title') || ! Input::get('body')){
            return $this->setStatusCode(422)->respondWithError('Parameters failed validation for a lesson.');
        }

        Lesson::create($request->all());

        return $this->respondCreated('Lesson successfully created.');

    }

    /**
     * Display the specified resource.
     * 
     * @return \Illuminate\Http\Response
     */
    public function show($id)
    {
        $lesson = Lesson::find($id);

        if( ! $lesson) {

            return $this->respondNotFound('Lesson does not exist');


        }

        return $this->respond([

            'data' => $this->lessonTransformer->transform($lesson)

        ]);

    }

}

When I test my code above with POSTMAN using POST request. I am prompted with "{"error":"Parameters failed validation for a lesson.","status_code":422}" . I receive an error when I try to add data or I don't add data.

Do you have any idea how to correct my store() code? Any help is appreciated.

Answer 1

The problem with my code above is that it does not have the $request var in the store() method.

In my code be below, the Request class is now injected into store method.

public function store(Request $request)
{

    if (! $request->input('title') or ! $request->input('body') )   
    {
         return $this->respondUnprocessableEntity('Parameters failed validation for a lesson.');
    }

    Lesson::create($request->all());

    return $this->respondCreated('Lesson successfully created.');

}

Note: In postman, select x-www-form-urlencoded in Body

Answer 2

To validate form data in Laravel simply use "Laravel Form Requests". This allows you to validate your form data in request using some predefined validation rules of Laravel and if you need you can also create you custom laravel validation logic.

According to Laravel docs:

Form requests are custom request classes that contain validation logic.

It will simplify your validation logic, make your code neat and let you handle complex validations.

Answer 3

Try this, might help

public function store(Request $request)
    {
    if( ! $request->has('title') || ! $request->has('body')){
        return $this->setStatusCode(422)->respondWithError('Parameters failed validation for a lesson.');
    }

    Lesson::create($request->all());

    return $this->respondCreated('Lesson successfully created.');

    }