Make a sum() of column accessors Laravel - laravel

Question

im improving my skills in laravel making a simple challenges web but i stuck on the next problem.
I have the users table with the id, name, mail, etc. The challenges table where i list all the challenges (with columns id, name, body, answer, score) and a third table called "Answers" where i post each try of the users solving a challenge with the columns id, user_id, challenge_id, success (boolean) and score.
Now i'am trying to make a ranking of users with their scores. The problem is to show a sum() of the column 'score' in the table answers where user_id.answers = users.id. So i can get easy the total score for each user.
For now i solved the problem doing this in blade:
#foreach($users as $user)
<tr>
<th>{{ $user->id }}</th>
<td>{{ $user->name }}</td>
<td>Team pindonga</td>
<td>{{ score = DB::table('answers')->where('user_id', $user->id)->sum('score') }} </td> </tr>
#endforeach
works perfectly, but i want to get them by desc score (for now i solved the desc with js but want to get desc order from the eloquent query) and have something like this in the blade:
#foreach($users as $user)
<tr>
<th>{{ $user->id }}</th>
<td>{{ $user->name }}</td>
<td>Team pindonga</td>
<td>{{ $team->score }} </td> </tr>
#endforeach
I was thinking about solve it with accessors doing something like this:
public function getScoreAttribute($value)
{
return $this->groupBy('user_id')->where('user_id', '=', $value)->sum('score');
}
also i have a relationship belongsTo in the answers modle to users and a hasMany in the users to answers. But i'm not sure of how pass the results to blade. Tried in tinker:
>>> \App\Answer::find(1)->score;
=> "3400"
>>> \App\Answer::find(2)->score;
=> "3400"
>>> \App\Answer::find(5)->score;
=> "3400"
allways getting the sum of the id = 1. And with $user->score; in the blade foreach i got a '0'.

Answer 1

Using the relationship with Blade would be {{ $user->answers->sum('score') }}. No accessor needed.
For sorting I would use the sortByDesc collection method.
$users = User::get();
$users = $users->sortByDesc(function ($user) {
return $user->answers->sum('score');
});

Answer 2

I think this is what you're looking for. It takes a while to get used to Eloquent ORM :-)
foreach($users as $user){
print $user->answers->sum('score');
}
https://laravel.com/docs/5.6/queries#aggregates