如何在laravel应用程序中按hasMany相关表列的总和对结果进行排序

Question

I am trying to order my API results by the sum of a hasMany relationship column in a laravel app. I'm trying to order my results by the sum of the count column in plays table so songs with the most plays appear first. I've seen other SO answers but they mainly deal with count and not sum. My setup is

Tables

Songs

id
name

Plays

date
count
song_id

Models

Song.php

public function plays()
{
    return $this->hasMany('App\Models\Play');
}

Play.php

public function song()
{
    return $this->belongsTo('App\Models\Song');
}

Contoller.php

// Works
// $songs = Song::withSum('plays', 'count')->paginate(10);

// Does not work with orderBy.
$songs = Song::withSum('plays', 'count')->orderBy('plays_sum_count', 'desc')->paginate(10);

If I remove the orderBy from the above piece of code in the controller I get an array of songs with the plays_sum_count value set correctly but when I try to order it the request keeps running(in postman) resulting in an eventual timeout.

How can I get a result set ordered by the sum of the count column in plays?

Answer 1

try group your result then order them by the sum:

$songs = Song::join('plays','plays.soung_id','=','songs.id')->select('songs.*')->groupBy('songs.*')
->orderByRaw('SUM(plays) DESC')>paginate(10);

please pay attention to the table names