Php laravel查询一个'；它被称为pior

我有下面的代码来获取一个模型的所有评级信息，正如你所看到的，有很多查询正在进行，只是为了评级信息，这个函数可以做得更好，特别是对于查询负载，所以它不会在每次请求此信息时耗尽服务器

public function ratingInfo() {

    $totalCount  = $this->ratings()->count();  
    $one_star    = $this->ratings()->where('rating', '>', 0)->where('ratings', '<=', 1);
    $two_star    = $this->ratings()->where('rating', '>', 1)->where('ratings', '<=', 2);
    $three_star  = $this->ratings()->where('rating', '>', 2)->where('ratings', '<=', 3);
    $four_star   = $this->ratings()->where('rating', '>', 3)->where('ratings', '<=', 4);
    $three_star  = $this->ratings()->where('rating', '>', 4)->where('ratings', '<=', 5);

    return [
        'avgRating'   => $this->avgRating(),
        'ratingCount' => $this->ratingCount(),
        'one_star'    => ['count' => $one_star->count(),  'percent' => round(($one_star->count()   * $totalCount) / 100, 2)],
        'two_star'    => ['count' => $two_star->count(),  'percent' => round(($two_star->count()   * $totalCount) / 100, 2)],
        'three_star'  => ['count' => $two_star->count(),  'percent' => round(($three_star->count() * $totalCount) / 100, 2)], 
        'four_star'   => ['count' => $four_star->count(), 'percent' => round(($four_star->count()  * $totalCount) / 100, 2)], 
        'five_star'    => ['count' => $five_star->count(), 'percent' => round(($five_star->count()  * $totalCount) / 100, 2)], 
    ];
}

评级模式：

class Rating extends Model
{
    protected $table = 'ratings';

    protected $fillable = ['rating', 'comment', 'user_id', 'rateable_id', 'rateable_type'];   

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

答案是：

public function ratingInfo() {

    $result = [];

    $one_star = $this->ratings->filter(function ($item, $key) { 
        return $item->rating > 0 && $item->rating <= 1;
    });

    $two_star = $this->ratings->filter(function ($item, $key) { 
        return $item->rating > 1 && $item->rating <= 2;
    });

    $three_star = $this->ratings->filter(function ($item, $key) { 
        return $item->rating > 2 && $item->rating <= 3;
    });

    $four_star = $this->ratings->filter(function ($item, $key) { 
        return $item->rating > 3 && $item->rating <= 4;
    });

    $five_star = $this->ratings->filter(function ($item, $key) { 
        return $item->rating > 4 && $item->rating <= 5;
    });

    $totalCount = $this->ratings->count();  
    $avgRating = $this->avgRating(2);  
    $totalRatings = $this->ratings->sum('rating');
    //dd('sum: ' . $one_star->sum('rating') . ' count: ' . $one_star->count() . ' percent: ' . round(($one_star->sum('rating') / $this->ratings->sum('rating')) * 100, 2));

    return [
    'total_count' => $totalCount,
    'average_rating' => $avgRating,
    'total_ratings' => $totalRatings,
        'one_star' => [
            'sum' => $one_star->sum('rating'),
            'count' => $one_star->count(),
            'percent' =>  round(($one_star->sum('rating') / $totalRatings) * 100, 2)
        ],
        'two_star' => [
            'sum' => $two_star->sum('rating'),
            'count' => $two_star->count(),
            'percent' =>  round(($two_star->sum('rating') / $totalRatings) * 100, 2)
        ],
        'three_star' => [
            'sum' => $three_star->sum('rating'),
            'count' => $three_star->count(),
            'percent' =>  round(($three_star->sum('rating') / $totalRatings) * 100, 2)
        ],
        'four_star' => [
            'sum' => $four_star->sum('rating'),
            'count' => $four_star->count(),
            'percent' =>  round(($four_star->sum('rating') / $totalRatings) * 100, 2)
        ],
        'five_star' => [
            'sum' => $five_star->sum('rating'),
            'count' => $five_star->count(),
            'percent' =>  round(($five_star->sum('rating') / $totalRatings) * 100, 2)
        ]
    ];
}

public function ratingInfo（）{
$result=[]；
$one_star=$this->ratings->filter（函数（$item，$key）{
返回$item->rating>0&&$item->rating ratings->filter（函数（$item，$key）{
返回$item->rating>1&&$item->rating ratings->filter（函数（$item，$key）{
返回$item->rating>2&&$item->rating ratings->filter（函数（$item，$key）{
返回$item->rating>3&&$item->rating ratings->filter（函数（$item，$key）{
返回$item->rating>4&&$item->rating ratings->count（）；
$avgRating=$this->avgRating（2）；
$totalRatings=$this->ratings->sum（'rating'）；
//dd（$one'u star->sum（'rating'）。'count:'。$one'u star->count（）。'percent:'。四舍五入（$one'u star->sum（'rating'）/$this->ratings->sum（'rating'））*100，2）；
返回[
“总计数”=>$totalCount，
“平均评级”=>$avg，
“总评分”=>$totalRatings，
“一颗星”=>[
“总和”=>一颗星->总和（“评级”），
“count”=>$one_star->count（），
“百分比”=>round（$one_star->sum（'rating'）/$totalRatings）*100,2）
],
“双星”=>[
“总和”=>$2星->总和（“评级”），
“count”=>$two_star->count（），
“百分比”=>round（$two_star->sum（'rating'）/$totalRatings）*100,2）
],
“三星”=>[
“总和”=>三星->总和（“评级”），
“计数”=>$三星->计数（），
“百分比”=>四舍五入（$三星->总和（“评级”）/$totalRatings）*100,2）
],
“四星”=>[
“总和”=>四颗星->总和（“评级”），
“计数”=>$4星->计数（），
“百分比”=>四舍五入（$4星->总和（'rating'）/$totalRatings）*100,2）
],
“五星”=>[
“总和”=>五星->总和（“评级”），
“计数”=>$five_star->count（），
“百分比”=>四舍五入（$five_star->sum（'rating'）/$totalRatings）*100,2）
]
];
}

我会尝试以下方法：

$this->ratings()->selectRaw('rating, count(*) as C')
     ->groupBy('rating')
     ->orderBy('rating', 'DESC');

public function ratingInfo() {

    $all = $this->ratings()->get();
    $count = $all->count();
    $one_star = $all->filter(function ($item, $key) {
        return $item->rating === 1;
    });
    $two_star = $all->filter(function ($item, $key) {
        return $item->rating === 2;
    });
    $three_star = $all->filter(function ($item, $key) {
        return $item->rating === 3;
    });
    $four_star = $all->filter(function ($item, $key) {
        return $item->rating === 4;
    });
    $five_star = $all->filter(function ($item, $key) {
        return $item->rating === 5;
    });

    return [
        'avgRating'   => $this->avgRating(),
        'ratingCount' => $this->ratingCount(),
        'one_star'    => ['count' => $one_star->count(),  'percent' => round(($one_star->count()   * $totalCount) / 100, 2)],
        'two_star'    => ['count' => $two_star->count(),  'percent' => round(($two_star->count()   * $totalCount) / 100, 2)],
        'three_star'  => ['count' => $two_star->count(),  'percent' => round(($three_star->count() * $totalCount) / 100, 2)], 
        'four_star'   => ['count' => $four_star->count(), 'percent' => round(($four_star->count()  * $totalCount) / 100, 2)], 
        'five_star'    => ['count' => $five_star->count(), 'percent' => round(($five_star->count()  * $totalCount) / 100, 2)], 
    ];
}

这样做的目的是获得一行中每个等级的计数1-5，每个等级都有各自的计数

$this->whereHas('ratings', function($query) {
      $query->selectRaw('rating, count(*) as C')
            ->groupBy('rating')
            ->orderBy('rating', 'DESC')
})->get();

执行此操作时出错：

$all = $this->ratings()->get();

return $all;

您可以通过这样做进一步简化

$this->ratings->groupBy('rating')->each(function ($group) {
     return count($group);
});

---

您可以使用php执行一次查询并过滤结果，如下所示：

$this->ratings()->selectRaw('rating, count(*) as C')
     ->groupBy('rating')
     ->orderBy('rating', 'DESC');

public function ratingInfo() {

    $all = $this->ratings()->get();
    $count = $all->count();
    $one_star = $all->filter(function ($item, $key) {
        return $item->rating === 1;
    });
    $two_star = $all->filter(function ($item, $key) {
        return $item->rating === 2;
    });
    $three_star = $all->filter(function ($item, $key) {
        return $item->rating === 3;
    });
    $four_star = $all->filter(function ($item, $key) {
        return $item->rating === 4;
    });
    $five_star = $all->filter(function ($item, $key) {
        return $item->rating === 5;
    });

    return [
        'avgRating'   => $this->avgRating(),
        'ratingCount' => $this->ratingCount(),
        'one_star'    => ['count' => $one_star->count(),  'percent' => round(($one_star->count()   * $totalCount) / 100, 2)],
        'two_star'    => ['count' => $two_star->count(),  'percent' => round(($two_star->count()   * $totalCount) / 100, 2)],
        'three_star'  => ['count' => $two_star->count(),  'percent' => round(($three_star->count() * $totalCount) / 100, 2)], 
        'four_star'   => ['count' => $four_star->count(), 'percent' => round(($four_star->count()  * $totalCount) / 100, 2)], 
        'five_star'    => ['count' => $five_star->count(), 'percent' => round(($five_star->count()  * $totalCount) / 100, 2)], 
    ];
}

---

尝试使用case表达式构建一个数据透视函数，将结果作为一个查询执行的一部分，这将大大优化服务器负载，请注意mysql没有本机数据透视函数，这就是为什么我建议您使用case表达式， 然后，您必须使用laravel查询生成器方法将查询作为原始查询执行。。 以下仅为示例，请尝试相应地重写并运行它

select id,
sum(case when value = 1 then 1 else 0 end) ANSWER1_COUNT,
sum(case when value = 2 then 1 else 0 end) ANSWER2_COUNT
from survey
group by answer

---

我试着做你的例子，但我没有提到ratings（）是一个多变量关系。我在你的代码中得到了以下错误-调用undefined方法illumb\Database\Query\Builder:：ratings（），试试看，多态关系现在应该解决了。如果不这样做，就试试$this->ratings->…不带（）几乎在那里，但我现在发现了此错误列未找到：'order子句'中的1054未知列'DESC'忘记了order by子句中的列…doh！我得到了一个空数组，但有数据我使用对成员函数AddagerConstraints（）的示例调用得到此错误在arrayI上又增加了一个可能性，这次只对评级进行了收集操作