Laravel 5.3 withCount() nested relation

Question

The model structure is as follows

Tutorial -> (hasMany) Chapters -> (hasMany) videos

How can we load number of videos (video_count) from Tutorial Model with laravel 5.3's withCount() method

I have tried:

Tutorial::withCount('chapters')
->withCount('chapters.videos') // this gives error: Call to undefined method Illuminate\Database\Query\Builder::chapters.videos()
->all();

Edit

This works, Any Better solution?

Tutorial::withCount('chapters')
->with(['chapters' => function($query){
    $query->withCount('videos');
}])
->all();

You only need to do one ->withCount('chapters.videos'). Also, make sure your relationships are set properly. — , Sep 22 '16 at 15:22
@DigitalFire Relationships are correct as i can load them with eager loading. just count doesn't populates with withCount() method — Sahil Deliwala, Sep 23 '16 at 05:49
Please post your *edit* in answers section. I just prefer to do that. — Maulik, Oct 08 '17 at 09:04

score 59 · Accepted Answer · edited Nov 08 '19 at 08:17

You can only do a withCount() on a defined relation of the model.

However, a relationship can be hasManyThrough which would achieve what you are after.

class Tutorial extends Model
{
    function chapters()
    {
        return $this->hasMany('App\Chapter');
    }

    function videos()
    {
        return $this->hasManyThrough('App\Video', 'App\Chapter');
    }
}

And then you can do:

Tutorial::withCount(['chapters', 'videos'])

Docs:

https://laravel.com/docs/5.3/eloquent-relationships#has-many-through

Laravel 5.3 withCount() nested relation

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