less and less simple

membership.rb

class Membership

  belongs_to :user
  belogns_to :group

  after_save :send_notifications, if: ->(m) { m.accepted_changed? && m.accepted? }

  def send_notifications
    Resque.enqueue MembershipNotificationsWorker, self.id 
  end

end 

class MembershipNotificationsWorker
  
  def perform(membership_id, user_id)
    membership = Membership.find(membership_id)
    user = User.find(user_id) 
    NotificationMailer.accepted(membership, user).deliver!
    PushNotifcations::NewMembership.new(membership, user).dispatch!

    admins = membership.group.admins - user
    admins.each do |admin| 
      NotificationMailer.accepted_admin(membership, admin).deliver!
      PushNotifcations::NewMembershipForAdmin.new(membership, user).dispatch!
    end
  end

end