Registration of user and account: Role.rb, which manages roles for permissions and other uses

role.rb

# see https://gist.github.com/RichardJordan/9059633 for explanation
# -----------------------------------------------------------------

############################################
# create_table "roles", force: true do |t| #
#   t.integer  "account_id", null: false   #
#   t.integer  "user_id",    null: false   #
#   t.string   "name",       null: false   #
#   t.datetime "created_at"                #
#   t.datetime "updated_at"                #
# end                                      #
############################################

class Role < ActiveRecord::Base
  belongs_to :account
  belongs_to :user
  has_many :grant_events

  validates :name, presence: true
  validates :user, presence: true
  validates :account, presence: true

  def add_event(event)
    save
  end

  def grant(granter)
    new_grant(granter: granter).allow
  end

  def new_grant(*args)
    grant_source.call(*args).tap do |ge|
      ge.role = self
    end
  end

  def revoke(granter)
    new_grant(granter: granter).deny
  end

private

  def grant_source
    @grant_source ||= GrantEvent.public_method(:new)
  end

end