一个类能不能有两个一样的has_many子类集合，就像一个聊天室有主持人和所有人，但他们都是User

class Chatroom < ActiveRecord::Base
  has_many :replies
  has_many :discussants 
  has_many :users,
           :through => :discussants
  has_many :comperes,  
           :through => :discussants,  
           :class_name => "User",  
           :conditions => ['role = 6']
end

视图里调用users是正常的，但调用comperes出错，提示
ActiveRecord::HasManyThroughSourceAssociationNotFoundError in Chatrooms#index
Showing chatrooms/index.html.erb where line #11 raised:

Could not find the source association(s) :compere or :comperes in model Discussant.  Try 'has_many :comperes, :through => :discussants, :source => <name>'.  Is it one of :chatroom or :user?

一个开源项目里用同样的示例运行也有问题。
rails2.0 ruby1.8 Mongrel 1.1.2

你按他的提示做试试。
has_many :comperes,
:through => :discussants,
:source => :user,
:conditions => ['role = 6']

奇怪原来试过不行，现在又试了一遍，又可以了。：）