Laravel Api update and delete function

Question

I'm building an API, i'm getting the following error while updating and deleting from table i'm using postman to test my api

    //update error
QueryException in Connection.php line 770:
SQLSTATE[23000]: Integrity constraint violation: 1048 Column 'title' cannot be null (SQL: update `lessons` set `title` = , `body` = , `completed` = , `updated_at` = 2017-01-03 09:14:10 where `id` = 11)

//delete error
FatalErrorException in LessonsController.php line 80:
Call to a member function delete() on null

My controller LessonsController

<?php

namespace App\Http\Controllers;

use Response;
use App\lesson;
use Illuminate\Http\Request;
use App\Acme\Transformers\LessonTransformer;
use Illuminate\Support\Facades\Input;

class LessonsController extends ApiController {

    protected $lessonTransformer;

    function __construct(LessonTransformer $lessonTransformer) {

        $this->lessonTransformer = $lessonTransformer;

    }

    //fetch all and pass a metadata 'data' 
    public function index() {

        $lessons = Lesson::all();

        return $this->respond([

            'data' => $this->lessonTransformer->transformCollection($lessons->all())

        ]);
    }


    //fetch by id
    public function show($id) {

        $lesson = Lesson::find($id);

        if(! $lesson) {

            return $this->respondNotFound();

        }

        return $this->respond([

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

        ]);
    }


    public function store() {

        if (! input::get('title') or ! input::get('body')) {
            return $this->respondBadRequest();
        }

        Lesson::create(input::all());

        return $this->respondCreated();

    }


    public function update(Request $request, $id) {

        $ulesson = Lesson::find($id);

        $ulesson->title = $request->input('title');
        $ulesson->body = $request->input('body');
        $ulesson->completed = $request->input('completed');
        $ulesson->save();

        return "Sucess updating user #" . $ulesson->id;
    }   


    public function destroy(Request $request) {
        $dlesson = Lesson::find($request->input('id'));

        $dlesson->delete();

        return "Employee record successfully deleted #" . $request->input('id');
    }

}

my model Lesson

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

class Lesson extends Model
{
    protected $fillable = ['title', 'body', 'completed',];

    //protected $hidden =['title'];
}

the store and other functions are working fine

Thank You

Answer 1

Please check you postman and set it like this