client.rb

  def events_all_accounts(time)
    self.accounts.flat_map do |account|
      account.events.send(time, account.now).where(:client_id => self.id)
    end.uniq.sort_by { |a| a.start_time }
  end
  private :events_all_accounts

  # all upcoming events for a client
  def future_events_all_accounts
    events_all_accounts(:in_future)
  end
  
  # all past events for a client
  def past_events_all_accounts
    events_all_accounts(:in_past)
  end