我有一个有很多与我的团体和客人模型的关系。下面是型号:有很多通过问题
class Group < ActiveRecord::Base
has_many :memberships, :dependent => :destroy
has_many :guests, :through => :memberships
def self.find(group)
self.find_by_name(group).guest.collect{ |x| x.name }
end
end
class Guest < ActiveRecord::Base
has_many :memberships, :dependent => :destroy
has_many :groups, :through => :memberships
end
class Membership < ActiveRecord::Base
belongs_to :guest
belongs_to :group
end
我在控制台检查和这里的结果:
ruby-1.9.2-head :001 > Group.first.guests
=> []
ruby-1.9.2-head :002 > Guest.first.groups
(Object doesn't support #inspect)
=>
为什么没有第二个工作?我试图检查组的类,但它总是返回一个错误:
ruby-1.9.2-head :005 > Guest.first.groups.class
NoMethodError: undefined method `guest' for nil:NilClass
任何人都可以帮助我吗?我其实只是试图遵循本指南:http://millarian.com/programming/ruby-on-rails/quick-tip-has_many-through-checkboxes/
哦,废话!我没有意识到我意外地压倒了它。当我重构时,我认为我的方法是find_group而不是find。大声笑!谢谢那个地点的人。 – corroded 2011-02-27 16:10:44