laravel adding condition to relation

1App\Request::where('id',4)
2    ->whereHas('quotes', function ($query) {
3        $query->where('status','=','3');
4    })
5    ->with('quotes','sourceTable','destinationTable')
6    ->get(); 
7

1class Game extends Eloquent {
2    // many more stuff here
3
4    // relation without any constraints ...works fine 
5    public function videos() {
6        return $this->hasMany('Video');
7    }
8
9    // results in a "problem", se examples below
10    public function available_videos() {
11        return $this->videos()->where('available','=', 1)->get();
12    }
13}