Scope with join on :has_many :through association

Question

class Users < ActiveRecord::Base
  has_many :meetings, :through => :meeting_participations
  has_many :meeting_participations
end

class Meetings < ActiveRe         


        

Answer 1

It would seem to me that it is not sensible to use a scope on Meeting for your purpose. A meeting itself has no visibility, but the participation has. So I would suggest an extension on the association within User:

class User < ActiveRecord::Base
  has_many :meetings, :through => :meeting_participations do
    def visible
      ids = MeetingParticipation.
        select(:meeting_id).
        where(:user_id => proxy_owner.id, :visible => true).
        map{|p| p.meeting_id}
      proxy_target.where("id IN (?)", ids)
    end
  end
  ...
end

I hope, this helps.