Php 按Laravel中的selectRaw关系排序（计算计数、总和…）

我有一个

问题

模型，它有许多

答案

<代码>答案也有许多

答案

和

评分

我添加了计算和加载

Answer

count和

Answer

rating sum的关系：

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;
use Illuminate\Support\Facades\Auth;
use App\Facades\AuthManager;

class Answer extends Model {
protected $with = [
        'user',
        'cards',
        'answers.user',
        'answersCountRelation',
        'ratingSumRelation'
];
protected $fillable = [
        'text',
        'user_id'
];

public function answerable() {
    return $this->morphTo();
}

public function user() {
    return $this->belongsTo(User::class);
}

public function answers() {
    return $this->morphMany(Answer::class, 'answerable');
}

public function reports() {
    return $this->morphMany(Report::class, 'reportable');
}

public function cards() {
    return $this->hasMany(Card::class);
}

public function ratings() {
    return $this->hasMany(Rating::class);
}

public function hasReported(User $user) {
    return ($user != null && $this->reports()->where([
            'user_id' => $user->id
    ])->first() != null);
}

public function hasRated(User $user) {
    return ($user != null && $this->ratings()->where([
            'user_id' => $user->id
    ])->first() != null);
}

public function answersCountRelation() {
    return $this->answers()->selectRaw('answerable_id, count(*) as count')->groupBy('answerable_id');
}

public function getAnswersCountAttribute() {
    return ($this->answersCountRelation->first() ? $this->answersCountRelation->first()->count : 0);
}

public function ratingSumRelation() {
    return $this->ratings()->selectRaw('answer_id, SUM(power) as sum')->groupBy('answer_id');
}

public function getRatingSumAttribute() {
    return ($this->ratingSumRelation->first() ? $this->ratingSumRelation->first()->sum : 0);
}
}