ShouldQueue Job pivot relation loaded

[gilesrussi]

• Laravel Version: 5.7.16
• PHP Version:7.2.10
• Database Driver & Version: Postgres 9.6

Description:

I have a Job class that implements "ShouldQueue" and uses the trait "serializes model".

class Test implements ShouldQueue
{
    use Dispatchable, InteractsWithQueue, Queueable, SerializesModels;
    public function __construct(Group $group)
    {
        $this->group = $group;
    }
    public function handle() {/** do stuff **/ return;}
}

The group class has relation with user:

class Group extends Model {
  public function users() {
    return $this->belongsToMany(User::class)
        ->using(GroupUserPivot::class)
        ->withPivot('id')
        ->as('group_user_pivot');
  }
}

The user also have a relation with groups

class User extends Model {
  public function groups() {
    return $this->belongsToMany(Group::class)
        ->using(GroupUserPivot::class)
        ->withPivot('id')
        ->as('group_user_pivot');
  }
}

And the GroupUserPivot has a relation with roles (the roles the user have in that group);

class GroupUserPivot extends Pivot {
  public function roles() {
    return $this->belongsToMany(Role::class);
  }
} 

Steps To Reproduce:

On tinker:

$group = User::first()->groups()->first()
$group->group_user_pivot->load('roles')
\App\Jobs\Test::dispatch($group)

This will be the result of the serialization:

{
  "group": {
    "class": "App\\Group",
    "id": 1,
    "relations": [
      "group_user_pivot.roles",
    ],
    "connection": "pgsql"
  },
  "job": null,
  "connection": null,
  "queue": null,
  "chainConnection": null,
  "chainQueue": null,
  "delay": null,
  "chained": []
}

When de-serialized, it will try to load the relations and it will throw an error:

Illuminate\Database\Eloquent\RelationNotFoundException: 
Call to undefined relationship [group_user_pivot.roles] on model 
[App\Group in [path]/vendor/laravel/framework/src/Illuminate/Database/Eloquent
/RelationNotFoundException.php:34

[taylorotwell]

Fixed in 2019 by #27358