调用 undefined 方法 IlluminateDatabaseEloquentCollection::


Call to undefined method IlluminateDatabaseEloquentCollection::whereHas() in laravel

我在控制器上的以下代码段遇到问题:

$opportunity_date = $oppr_arr->opportunity_date;
$locations_array_result = explode(",",$locations_array_result);
$usersCount = User::where('activated', '=', 1)
                  ->where('group_id', '=', 1)
                  ->where('availability_date', '<=', $opportunity_date)
                  ->get();
foreach ($locations_array_result as $param) {
    $usersCount = $usersCount->whereHas('desiredLocation', function ($q) use($param) {
        $q->where('location_id', '=', $param );
    });
}
$usersCount = $usersCount->count();

当我运行它时,它给了我以下错误:

Call to undefined method Illuminate'Database'Eloquent'Collection::whereHas()

我的关系是这样设置的:

用户模型

public function desiredLocation()  {
     return $this->belongsToMany('Location', 'user_desired_location');
} 

位置模型

class Location extends 'Eloquent {
    protected $table = 'locations';
    protected $fillable = array('name');
    public function country() {
        return $this->belongsTo('Country');
    }
}

user_desired_location表的数据库结构为:

- id
- user_id
- location_id

您调用get太早了,这是在您想要之前运行查询。在foreach循环之后移动它可以解决它:

$usersCount = User::where('activated', '=', 1)
                  ->where('group_id', '=', 1)
                  ->where('availability_date', '<=', $opportunity_date);
foreach ($locations_array_result as $param) {
    $usersCount = $usersCount->whereHas('desiredLocation', function($q) use($param){
        $q->where('location_id', '=', $param );
    });
}
$users = $usersCount->get();
$usersCount = $users->count();

另请注意:如果您感兴趣的只是计数并且您不会使用实际用户,则无需调用get然后count;这通过实际获取所有用户并在PHP端计数来产生不必要的负载。相反,直接使用count,Eloquent 将发出COUNT()查询,在数据库端执行此操作。这样:

$usersCount = $usersCount->count();
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