问在拉拉维尔不存在的地方

EN

SELECT i.*
FROM item i
LEFT JOIN qualifications q ON q.item_id = i.id  AND q.user_id = 2
WHERE q.item_id IS NULL

DB::table('item as i')
    ->select('i.*')
    ->leftJoin('qualifications as q', function ($join) use($user_id) {
        $join->on('q.item_id', '=', 'i.id')
             ->on('q.user_id', '=', $user_id);
    })
    ->whereNull('q.item_id')
    ->get();

class Item extends Model
{
    public function qualifications()
    {
        return $this->hasMany(\App\Models\Qualification::class, 'item_id');
    }
}

class Qualification extends Model
{
    public function qualifications()
    {
        return $this->belongsTo(Item::class, 'item_id');
    }
}

Item::whereDoesntHave('qualifications', function ($query) use($user_id) {
    $query->where('user_id', '=', $user_id);
})->get();