How can I replace existing relation? At this moment, I have tables:

requirements

user_requirement

And I have this relation in User model:

public function requirements(){
    return $this->belongsToMany('\App\Requirement', 'user_requirement')->withTimestamps();
}  

Now I created new table - activities:

And now, how can I set ID from activities for requirement_id in this relation in model? I do somethink like this:

return $this->belongsToMany('\App\Activities', 'user_requirement', 'requirement_id', 'ID' )->withTimestamps();

But when I'm try to do in view ($req->ID is Activity ID):

@if( !$user->activities()->get()->contains( $req->ID ) ) {
  No activity
@else
  Yes activity
@endif

I'm getting always FALSE