ErrorException Trying to get property 'User' of non-object ( laravel ) - php

Question

I am getting the error:
ErrorException Trying to get property 'User' of non-object
from the statements below which don't seem to work:
$user = Mobile::find(3)->User;
dd($user);
rest of the code is as follows:
usercontroller.php
<?php
namespace App\Http\Controllers;
use Illuminate\Http\Request;
use App\Models\User;
use App\Models\Mobile;
use Hash;
class UserController extends Controller
{
public function addUserMobile()
{
$user = new User;
$user->name = "Test Name";
$user->email = "test#mnp.com";
$user->password = Hash::make("12345678");
$user->save();
$mobile = new Mobile;
$mobile->mobile = '123456789';
$user->mobile()->save($mobile);
}
public function index()
{
// get user and mobile data from User model
$user = User::find(3);
// var_dump($user->name);
// var_dump($user->mobile->mobile);
// // get user data from Mobile model
$user = Mobile::find(3)->User;
dd($user);
// // get mobile number from User model
// $mobile = User::find(3)->mobile;
// dd($mobile);
}
}
mobile.php
<?php
namespace App\Models;
use Illuminate\Contracts\Auth\MustVerifyEmail;
use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Foundation\Auth\User as Authenticatable;
use Illuminate\Notifications\Notifiable;
class User extends Authenticatable
{
use HasFactory, Notifiable;
/**
* The attributes that are mass assignable.
*
* #var array
*/
protected $fillable = [
'name',
'email',
'password',
];
/**
* The attributes that should be hidden for arrays.
*
* #var array
*/
protected $hidden = [
'password',
'remember_token',
];
/**
* The attributes that should be cast to native types.
*
* #var array
*/
protected $casts = [
'email_verified_at' => 'datetime',
];
public function mobile()
{
return $this->hasOne(Mobile::class);
// note: we can also inlcude Mobile model like: 'App\Mobile'
}
}
mobile table.php
<?php
use Illuminate\Database\Migrations\Migration;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Support\Facades\Schema;
class CreateMobilesTable extends Migration
{
/**
* Run the migrations.
*
* #return void
*/
public function up()
{
Schema::create('mobiles', function (Blueprint $table) {
$table->bigIncrements('id');
$table->unsignedBigInteger('user_id');
$table->string('mobile');
$table->timestamps();
$table->foreign('user_id')->references('id')->on('users')
->onDelete('cascade');
});
}
/**
* Reverse the migrations.
*
* #return void
*/
public function down()
{
Schema::dropIfExists('mobiles');
}
}
mobile database
user database
"3" is user_id btw.

Answer 1

The problem is you are querying the Mobile with id 3 (which does not exist) and then calling the user relation.
$user = Mobile::find(3)->user;
Since Mobile::find with an id that doesn't exist returns null, you are calling ->user on null, and you will get the error you mentioned.
Also, you should add a belongsTo relation in your Mobile model:
public function user()
{
return $this->belongsTo(User::class);
}
Now, after fixing your query to use user_id, you can do:
$user = Mobile::where('user_id', 3)->first()->user;