Laravel - Query builder with subquery - mysql

Question

So i have a pivot table like the following :
match id
player id
score
And i want to query to get the number of wins/losses for a given user id. (wins based on user id with the highest score for a game)
In sql i would write this like :
SELECT user_id, score
from match_user matchu1
where score = (select max(score) from match_user matchu2 where matchu1.match_id = matchu2.match_id)
How would i express this query in laravel, or is there a better method of doing this that i am missing ?

Answer 1

There are multiple ways to achieve this. The easiest and cleaniest way to me is defining
a relationship with pivot.
class Match extends Model
{
public function players()
{
return $this->belongsToMany(User::class, 'match_user')->withPivot('score');
}
public function winner()
{
return $this->players
->sortByDesc(function ($player) {
return $player->pivot->score;
})
->first();
}
}
Then you can simply get the winner by saying:
$match->winner();

Answer 2

This is to answer your true intention of asking this question, which is to get the number of wins for a single user, as you commented on my answer. The following the the best solution that I can think of for now:
class Match extends Model
{
public function scopeWonBy($query, User $user)
{
return $query->selectRaw('matches.id, max(match_user.score) AS max_store, match_user.player_id AS player_id')
->join('match_user', 'matches.id', '=', 'match_user.match_id')
->groupBy('matches.id')
->having('player_id', $user->id);
}
}
Later on, you can say:
$matches = Match::wonBy($user);
$count = Match::wonBy($user)->count();

Answer 3

I'm not going to write your query for you as I don't want to provide an untested solution but the following code example should give you a good idea of how to implement subqueries with the query builder.
$q->where('price_date', function($q) use ($start_date)
{
$q->from('benchmarks_table_name')
->selectRaw('min(price_date)')
->where('price_date', '>=', $start_date)
->where('ticker', $this->ticker);
});