Laravel雄辩的生成器，带有关系的3张桌子

Question

I have 3 models that are: contracts , centers and user_centers .

The relationship between contracts and centers is 1 to N (1 center has N contracts)

And the relation between centers and user_centers , is 1 center has N user_centers .

I'm trying to eloquent a function that returns contracts by filtering by a user_id ( user_centers table)

For that I do the following

    $query = Contract::query();
    $user_id = $request->query('userId');

    $query->when(request('user_id'), function ($q) use ($user_id) {
        $q->whereHas('centers.user_centers', function ($q) use ($user_id) {
            $q->where('user_id', $user_id);
        });
    });

This does not work and I do not know if I have not understood the relationship or eloquent.

Thank you

Answer 1

Just add a function on modal

class Contracts extends Model {
     ...
     public function centres()
     {
         $this->hasMany(Centres::class, 'centre_id', 'id');
     }
}

When for 1 centers with many user_centres use this function in model:

class Centers extends Model {
     ...
     public function user_centers()
     {
         $this->hasMany(user_centers::class, 'user_centers_id', 'id');
     }
}

and eloquent :

Contract::with('centres')->get();