laravel 5通过替换Join来优化whereHas

我有一个带过滤器的车辆列表页面 . 我创建了一个范围，用于将选定的过滤器应用于车辆表 . 范围利用了雄辩的whereHas方法 . 但是在执行查询时它会出现严重的性能问题，因为我看到每个whereHas都转换为子查询而不是Join . 请参阅下面的我的范围函数和查询运行

public function scopeApplyFilter($query, $conditions, $featured=0)
{

    $query->where(function($q) use ($conditions){
        if ($conditions->get('content')) {
            $q->where('text', 'like', '%'.$conditions->get('content').'%' );
        }
        if ($conditions->get('condition')) {
            $q->where('condition', $conditions->get('condition'));
        }
        if ($conditions->get('transmission')) {
            $q->where('transmission', $conditions->get('transmission'));
        }
        if ($conditions->get('price')) {
            $range = explode('-', $conditions->get('price'));

            $q->where('price', '>=',$range[0]);
            $q->where('price', '<=',$range[1]);
        }
        if ($conditions->get('odometer')) {
            $range = explode('-', $conditions->get('odometer'));

            $q->where('odometer', '>=',$range[0]);
            $q->where('odometer', '<=',$range[1]);
        }
        if ($conditions->get('year')) {
            $range = explode('-', $conditions->get('year'));

            $q->where('year', '>=',$range[0]);
            $q->where('year', '<=',$range[1]);
        }

        return $q;
    })->whereHas('model', function($q) use ($conditions) {
        if ($conditions->get('model')) {
            $q->where('model_name', $conditions->get('model'));
        }
        return $q;
    })->whereHas('make', function($q) use ($conditions) {
        if ($conditions->get('make')) {
            $q->where('make_name', $conditions->get('make'));
        }
        return $q;
    })->whereHas('dealer.province', function($q) use ($conditions) {
        if ($conditions->get('province')) {
            $q->where('province_name', $conditions->get('province'));
        }
        return $q;
    })->whereHas('dealer', function($q) use ($conditions, $featured) {
        if($featured){
            $q->where('featured', 1);
        }
        if ($conditions->get('lat')) {
            //$conditions->put('distance',5000);
            $lat = $conditions->get('lat');
            $lon = $conditions->get('lon');
            $lat = 53.421879;
            $lon = -113.4675614;
            $q->select(DB::raw("id, ( 6371 * acos( cos( radians($lat) ) * cos( radians( latitude ) ) * cos( radians( longitude ) - radians($lon) ) + sin( radians($lat) ) * sin( radians( latitude ) ) ) ) AS distance"))->having('distance','<',$conditions->get('distance')); //3959 for miles
        }
        return $q;
    });
}

查询运行是

SELECT * 
FROM   `vehicles` 
WHERE  EXISTS (SELECT * 
               FROM   `models` 
               WHERE  `vehicles`.`model_id` = `models`.`id`) 
   AND EXISTS (SELECT * 
               FROM   `makes` 
               WHERE  `vehicles`.`make_id` = `makes`.`id`) 
   AND EXISTS (SELECT * 
               FROM   `dealers` 
               WHERE  `vehicles`.`dealer_id` = `dealers`.`id` 
                      AND EXISTS (SELECT * 
                                  FROM   `provinces` 
                                  WHERE  `dealers`.`province_id` = 
                                 `provinces`.`id`)) 
   AND EXISTS (SELECT id, 
                      ( 6371 * Acos(Cos(Radians(53.421879)) * 
                                    Cos(Radians(latitude)) * 
                                    Cos( 
                                                  Radians(longitude) 
                                                  - Radians( 
                                                  -113.4675614)) 
                                    + 
                                             Sin(Radians(53.421879)) * 
                                             Sin(Radians(latitude))) 
                                 ) AS 
                      distance 
               FROM   `dealers` 
               WHERE  `vehicles`.`dealer_id` = `dealers`.`id` 
               HAVING `distance` < 200) 
   AND `status_id` = 1 
ORDER  BY `created_at` DESC 
LIMIT  15 offset 0

501.16毫秒

我正在使用Laravel 5.2 . 制造，模型和经销商是'属于'车辆的关系 . 一切正常 . 但是由于性能问题，我不得不使用连接重写函数 . 伙计们，请帮助我们根据上面给出的条件使用连接重写此函数的最佳实践 . 非常欢迎您的意见 .