Laravel 多对多关系搜索

Question

我现在有三个型号

用户

public function languages(){
    return $this->belongsToMany('App\Language');
}

报纸

public function languages(){
    return $this->belongsToMany('App\Language');
}

语言

public function users(){
    return $this->belongsToMany('App\User');
}

public function newspapers(){
    return $this->belongsToMany('App\Newspaper');
}

我已经有了

language_user

，

language_newspaper

桌子

在 Tinker 中，我已经通过 Attach() blablabla 成功检索了这两个关系。

问题是 我怎样才能在 eloquent 中搜索

Newspaper

id1 有这个

User

呢？对我来说似乎很复杂。

Language

User id1 -> has language en, zh

->好的

Newspaper id1 -> has language en, jp

-> 不行

我已经尝试过，但不确定是否正确

Newspaper id2 -> has language zh

$where = [];

Answer 1

foreach ($agent->languages as $language) {
array_push($where, $language->id);}

$newspapers = Newspaper::
join('language_newspaper', function ($join) use ($where) {
    $join->on('newspaper.id', '=', 
        'langauge_newspaper.newspaper_id')
        ->whereIn('langauge_newspaper.newspaper_id', $where);
})
->groupBy('newspaper.id')
->get();

，如下所示：

whereHas