view db/migrate/20090704172355_create_groups_users.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 CreateGroupsUsers < ActiveRecord::Migration
  def self.up
    create_table :groups_users, :id => false do |t|
      t.column :group_id, :integer, :null => false
      t.column :user_id, :integer, :null => false
    end
    add_index :groups_users, [:group_id, :user_id], :unique => true, :name => :groups_users_ids
  end

  def self.down
    drop_table :groups_users
  end
end