I'm trying to make my notifications for Laravel 6 mail out effectively. I have a model (Event) that has followers (User) as a relationship - see below.

Event: $this->belongsToMany('App\User')

When an action happens, I'd like to trigger an email notification out to all the followers and a few other users. This means I'm trying to combine all the users into a single collection. My current approach is to push any individual users onto the followers collection, then remove any unwanted users based on some logic, and return a deduplicated collection that gets called....

Notification::send($users, new MemoryCreated($memory));

I'm struggling to managing the collection (removing by model (not key since it's an incremental integer) then my effort to do this $users->unique('App\User'); didn't work.

Am I approaching this correctly? How can I modify the collection helpers to use the model->id for the forget and unique methods?

Thanks!