亂看 redmine code memo

def self.up<br /> create_table :groups_users, :id => false do |t|<br /> t.column :group_id, :integer, :null => false<br /> t.column :user_id, :integer, :null => false<br /> end<br /> add_index :groups_users, [:group_id, :user_id], :unique => true, :name => :groups_users_ids<br /> end<br />