Laravel Eloquent JOIN跨多个表

Question

I'm having trouble with a JOIN over 2 tables. One of them isn't associated directly with the Eloquent model 'Message'.

My Tables:

videos
-- id
-- file

messages
-- m_id
-- m_type
-- m_video

videos_languages
-- video_id
-- language_id

I have the following models:

User.php  
Video.php  
Message.php

Video.php has following relation:

public function languages()
{
    return $this->belongsToMany('Language','videos_languages','video_id','language_id')->withPivot('titel','vl_id');
}

Message.php

public function messageVideos()
{
    return $this->belongsTo('Video','m_video','id');
}

public function messageUser()
{
    return $this->belongsTo('Visitor','m_from','v_id');
}

In my main script, I do the following command:

$message = new Message();
$message->where('m_to','=',12345)->with('messageVideos','messageUser')->first()

So I get the data of Message with the associated tables "Videos" and "User".

My problem now: I also need videos_languages in this command, and it is not associated with the Message model.

Is it possible, to include it within the top command and use the languages() relation from the Video model?

Answer 1

I dont think you need "whereHas", but "Eager Load Constraints". This is found under eager loading in the laravel docs.

For Example:

$users = User::with(array('posts' => function($query)
{
    $query->where('title', 'like', '%first%');
}))->get();

You however need to nest it and load more relations.

So it's like this:

$message = Message::where('m_to','=',12345)
->with(array('messageVideos.languages' => function($query)
{
    $query->where('language_id', '=', 2);
},
'messageUser'))->first();