Laravel 5的关系

I have two tables. Like this

**

user_accounts               usersonglists
--------------              ---------------
id                          id
username                    user_account_id
slug                        etc..
etc..

** I created a route like this

/u/{slug}/songlists

This relation method in songlist model

public function userAccounts()
{
    return $this->belongsTo('App\Models\User\UserAccounts','user_account_id','id');
}

I created controller method like this

$songLists = $SongListRepository->getSongListsByUserSlug($slug);

This is getSongListByUserSlug($slug) method

$songList = $this->model->with('userAccounts')->get();

I want to get songlists by user with $slug.

Can someone help me?

You're looking for the whereHas method:

$query = $this->model->with('userAccounts');

$query->whereHas('userAccounts', function($query) use ($slug) {
    $query->where('slug', $slug);
})

$lists = $query->get();

BTW, you should probably rename that userAccounts method to the singular userAccount.

An easier way might be to start from the account:

$lists = UserAccount::where('slug', $slug)->songLists;

Assuming you've set up the inverse relationship.