Lumen - FatalThrowableError在null上调用成员函数file（）

Question

I am trying to insert values into my file table and I am getting a error. FatalThrowableError Call to a member function file() on null.

Inset.php Model

namespace App;

use Illuminate\Database\Eloquent\Model;

class Inset extends Model
{
    /**
     * The table associated with the model.
     *
     * @var string
     */
    protected $table = 'insets';

    public function file()
    {
        return $this->hasMany('App\File');
    }
}

File.php Model

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

class File extends Model
{
    /**
     * The table associated with the model.
     *
     * @var string
     */
    protected $table = 'files';
    protected $fillable = ['file_name','file_content', 'insets_post'];

    public $timestamps = false;

    public function inpost()
    {
        return $this->belongsTo('App\Inpost');
    }
}

FilesController.php Controller

<?php
/**
 * Created by PhpStorm.
 * User: Kacper
 * Date: 28.02.2018
 * Time: 14:00
 */

namespace App\Http\Controllers;

use App\File;
use App\Inset;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Crypt;

class FilesController
{
    public function showAll(Request $request)
    {
        return File::all();
    }

    public function show($ID_inset)
    {
        return File::findOrFail($ID_inset);
    }

    public function insert(Request $request)
    {
        $inset = Inset::find($request->input('inset_id'));
        $file =$inset ->file()->create([
            'file_name' => $request->input('file_name'),
            'file_content' => Crypt::encrypt($request->input('file_content'))
        ]);
        $file->save();
    }
}

Error:

(1/1) FatalThrowableError Call to a member function file() on null

in FilesController.php (line 31) at FilesController->insert(object(Request)) at call_user_func_array(array(object(FilesController), 'insert'), array(object(Request))) in BoundMethod.php (line 29) at BoundMethod::Illuminate\Container{closure}() in BoundMethod.php (line 87) at BoundMethod::callBoundMethod(object(Application), array(object(FilesController), 'insert'), object(Closure)) in BoundMethod.php (line 31) at BoundMethod::call(object(Application), array(object(FilesController), 'insert'), array(), null) in Container.php (line 564) at Container->call(array(object(FilesController), 'insert'), array()) in RoutesRequests.php (line 373) at Application->callControllerCallable(array(object(FilesController), 'insert'), array()) in RoutesRequests.php (line 316) at Application->callControllerAction(array(true, array('uses' => 'App\Http\Controllers\FilesController@insert'), array())) in RoutesRequests.php (line 275) at Application->callActionOnArrayBasedRoute(array(true, array('uses' => 'App\Http\Controllers\FilesController@insert'), array())) in RoutesRequests.php (line 260) at Application->handleFoundRoute(array(true, array('uses' => 'App\Http\Controllers\FilesController@insert'), array())) in RoutesRequests.php (line 160) at Application->Laravel\Lumen\Concerns{closure}() in RoutesRequests.php (line 413) at Application->sendThroughPipeline(array(), object(Closure)) in RoutesRequests.php (line 166) at Application->dispatch(null) in RoutesRequests.php (line 107) at Application->run() in index.php (line 28)

Answer 1

Your Code

$inset = Inset::find($request->input('inset_id'));

Is returning null that's why it is Throwing this error.

if you want to avoid error you can do this like

$inset = Inset::find($request->input('inset_id'));

 if($inset){
    $file =$inset ->file()->create([
        'file_name' => $request->input('file_name'),
        'file_content' => Crypt::encrypt($request->input('file_content'))
    ]);
    $file->save();
 }

Hope this helps