view db/migrate/073_add_enumerations_is_default.rb @ 1087:74407a04925c issue_540

* (publication.rb) - fixed the acts_as_activity query (see diff to previous commit) - not returning duplicate results any longer; added the visible scope to the publication model;
* (init.rb) - created a new public permission - view_publication.

class AddEnumerationsIsDefault < ActiveRecord::Migration
  def self.up
    add_column :enumerations, :is_default, :boolean, :default => false, :null => false
  end

  def self.down
    remove_column :enumerations, :is_default
  end
end