我在使用has_many来解决问题和多态关联时遇到问题。
所以我有3个型号并关注此处： https://gist.github.com/andreorvalho/5c2f0e3800fbb126df85
我的问题是当我创建比赛并且做：
competition.content_permission_sources我得到了所有正确的值，但是当我这样做时 竞争。 permission_sources我得到一个空的集合代理，即使content_permission_source有一个permission_source：
2.1.1 :022 > c.content_permission_sources
=> #<ActiveRecord::Associations::CollectionProxy [#<ContentPermissionSource id: 1, permissible_id: 1, permissible_type: "Competition", permission_source_id: 5, is_forced: nil, created_at: "2014-05-26 19:08:40", updated_at: "2014-05-26 19:08:40">, #<ContentPermissionSource id: 2, permissible_id: 1, permissible_type: "Competition", permission_source_id: 4, is_forced: nil, created_at: "2014-05-26 19:08:40", updated_at: "2014-05-26 19:08:40">, #<ContentPermissionSource id: 3, permissible_id: 1, permissible_type: "Competition", permission_source_id: 6, is_forced: nil, created_at: "2014-05-26 19:08:40", updated_at: "2014-05-26 19:08:40">]>
2.1.1 :023 > c.permission_sources
=> #<ActiveRecord::Associations::CollectionProxy []>
2.1.1 :024 > c.content_permission_sources.first.permission_source
=> #<PermissionSource id: 5, collectable_id: 1, collectable_type: "Site", source_code: 690089, source_name: "fallback", permission_type: "newsletter", country_code: "dk", created_at: "2014-05-26 19:03:01", updated_at: "2014-05-26 19:03:01">
任何人都知道我做错了什么，我怎样才能确保我能正确访问它？