Relation in custom pivot table returns empty collection

[projct1]

I have this structure:

class Place extends Model
{
    public function discounts(): BelongsToMany
    {
        return $this->belongsToMany(Discount::class)->using(DiscountPlace::class);
    }
}

class Discount extends Model
{
    public function places(): BelongsToMany
    {
        return $this->belongsToMany(Place::class)->using(DiscountPlace::class);
    }
}

class DiscountPlace extends Pivot
{
    public $incrementing = true;

    public function activities(): MorphMany
    {
        return $this->morphMany(Activity::class, 'subject', 'subject_type', 'subject_id');
    }
}

Why does calling Place::first()->discounts->first()->pivot->activities return an empty collection, even though there is data?

If I call DiscountPlace::find(1)->activities, everything is fine.

[Cellard]

You should add withPivot(["id"]) to belongsToMany

[projct1]

You should add withPivot(["id"]) to belongsToMany

Yea, thanks, it works :)
By the way, can you tell me, how i can eager load activities for my DiscountPlace model? Something like this: Place::with('discounts.pivot.activities')->first()
Or its impossible without third party library?

[projct1]

While i do this:

Place::with('discounts')->find(5073)->map->pivot->map->activities;

I got this:

select * from `activity_log` where `activity_log`.`subject_type` = 'App\\Models\\DiscountPlace' and `activity_log`.`subject_id` = 1 and `activity_log`.`subject_id` is not null
select * from `activity_log` where `activity_log`.`subject_type` = 'App\\Models\\DiscountPlace' and `activity_log`.`subject_id` = 2 and `activity_log`.`subject_id` is not null
select * from `activity_log` where `activity_log`.`subject_type` = 'App\\Models\\DiscountPlace' and `activity_log`.`subject_id` = 3 and `activity_log`.`subject_id` is not null

[Cellard]

I don't know the answer 🥹

[shaedrich]

This couldn't have happened if #38215 or #37496 had been accepted.