Laravel sort child relationship collection - php

Question

I have the following 3 tables:
Movie
- id
Series
- id
- status_id
- movie_id
Status
- id
- order_number
this is the code on the controller:
$movie = Movie::where('slug', $slug)->with(['series'])->first();
this is the code for view:
#foreach ($movie->series as $series)
{{ $series->name}}
#endforeach
how to sort $movie->series based on status->order_number? if it can be written on the model, so every order is only written once the controller?
is there a code that I can use for example like this:
$movie->series->sortBy('status.order_number');

Answer 1

Yes, but you will need to join status with series:
$movie = Movie::where('slug', $slug)->with([
'series' => function ($query) {
// Subquery on `series` table
return $query
// select whatever you'll need
->select('series.*')
// join with status
->join('status', 'series.status_id', '=', 'status.id')
// order by order number
->orderBy('status.order_number')
// * you can drop this if you select all the fields you need and use those
->with('status');
},
])->first();
Edit this ^ method will sort on SQL level, but you could also do this with collections:
#foreach ($movie->series->sortBy('status.order_number') as $series)
{{ $series->name}}
#endforeach
In that case also add .status to your with to avoid n + 1 problem: ->with(['series.status'])
The reason your attempt didn't work is because ->sortBy(..) doesn't mutate the collection, it just returns a new sorted one. This would work:
$movie->series = $movie->series->sortBy('status.order_number');