RelationShip Eloquent hasOne - laravel

Question

I do not understand how the relationShips are working with Eloquent. Imagine an user with one role. I wrote this in my model User :
public function role()
{
return $this->hasOne('App\Models\Role');
}
And this in my model Role :
public function user()
{
return $this->belongsTo('App\User');
}
After that i would like to retrieve the role of the user connected , like that :
Auth::user()->role->role_name
But it throw an exception :
Undefined column: 7 ERROR: column roles.user_id does not exist
Does it not work like that?

Answer 1

You're missing the user_id foreign column in the roles table, Eloquent assumes that column to exist in order to link a User with a Role
Schema::create('roles', function (Blueprint $table) {
$table->bigIncrements('id');
$table->string('role_name');
$table->unsignedBigInteger('user_id');
$table->foreign('user_id')->references('id')->on('users')->onDelete('cascade');
$table->timestamps();
});
Update: given a hasOne relationship
App\User model
public function role()
{
return $this->hasOne('App\Models\Role');
}
App\Model\Role model
public function user()
{
return $this->belongsTo('App\User');
}
DatabaseSeeder
$user = factory('App\User')->create();
$user->role()->create([
'role_name' => 'Admin'
]);
routes/web
use Illuminate\Support\Facades\Auth;
Route::get('/', function () {
return Auth::user()->role->role_name;
});
Results => Admin

Answer 2

You should use the belongsTo() relationship in your User model for the role relationship :
public function role()
{
return $this->belongsTo('App\Models\Role');
}