Work in progress...

app.rb

require 'freddie'

class Event
  include Mongoid::Document
  # ...
end

class App < Freddie::App
  resource :events do
    permit do |user|
      can :read
      can :create if user.admin?
      can :update, :destroy, :user_id => user.id
    end
  end

  root :events
end