ruby-on-rails – Rails:为什么“has_many …,… through => …”关联会导致“NameError:uninitialized constant …”
要表示组可以有多个用户,并且用户可以属于多个组,我设置以下关联: class Group < ActiveRecord::Base
has_many :users_groups
has_many :users, :through => :users_groups
end
class User < ActiveRecord::Base
has_many :users_groups