Question

I have two arrays with different attributes for the objects contained in each.

participants

guests

The only field in common is provider_user_id

I want to do something like this

all_people = participants.map {|p| p.provider_user_id <> guests.provider_user_id }

This is probably not correct.

How can eliminate those participants who are also in the guests array?

Answer 1

The following works, but I’d be interested if there’s anything more concise.

guest_provider_ids = guest.map(&:provider_id)
non_guest_participants = participants.reject do |participant|
  guest_provider_ids.include?(participant.provider_user_id)
end