Laravel Checking If A Collection Contains A Foreign Key

I was wondering if there is a function or something else, where you can get an other element from a collection than the primary key... For example if votes would have a foreign key 'user_id', how do I check this? On the laravel doc there was only an example to check the primary key by using contains(). Can anyone help me out? Example that checks if there is a vote with id = 2 ``` @foreach($projects as $project) @if ($project->votes->contains(2)) // @endif @endforeach ``` I would want something to check if there is a vote that has a 'user_id' = signed in users id ``` @foreach($projects as $project) @if ($project->votes->contains('user_id' == Auth::id())) // @endif @endforeach ```