ensl.org/app/models/forumer.rb

# == Schema Information
#
# Table name: forumers
#
#  id         :integer          not null, primary key
#  forum_id   :integer
#  group_id   :integer
#  access     :integer
#  created_at :datetime
#  updated_at :datetime
#

class Forumer < ActiveRecord::Base
  ACCESS_READ = 0
  ACCESS_REPLY = 1
  ACCESS_TOPIC = 2

  include Extra

  scope :access,
    lambda { |level| {:conditions => ["access >= ?", level]} }

  validates_uniqueness_of :group_id, :scope => [:forum_id, :access]
  validates_presence_of [:group_id, :forum_id]
  validates_inclusion_of :access, :in => 0..2

  belongs_to :forum
  belongs_to :group

  before_create :init_variables

  def init_variables
    self.access ||= ACCESS_READ
  end

  def accesses
    {ACCESS_READ => "Read", ACCESS_REPLY => "Reply", ACCESS_TOPIC => "Post a Topic"}
  end
end