Question

这是处理嵌套文档，引用和嵌入文档的棘手问题。您可以找到一个包含说明问题的示例项目的zip文件。

我正在使用 Rails v3.0.9 Mongo v1.8.3 Mongoid v2.2.0

楷模

会话
消息
文本
媒体
链接
对话embeds_many消息（自动保存=＆gt; true）
消息has_many Media（autosave =＆gt; true）
文本继承自Message（STI）
链接继承自Link（STI）
A Conversation accept_nested_attributes_for：messages
消息accept_nested_attributes_for：medias

在rails控制台中，让我们做一些测试：

ruby-1.9.2-p180 :001 > c = Conversation.new({:messages_attributes => [{'_type' => 'Text', :content => 'content', :medias_attributes => [{'_type' => 'Link', :url => 'google.com'}]}]})
 => #<Conversation _id: 4e65c7275d156d0129000001, _type: nil, created_at: nil, updated_at: nil, title: nil> 
ruby-1.9.2-p180 :002 > c.messages
 => [#<Message _id: 4e65c7275d156d0129000002, _type: "Text", created_at: nil, updated_at: nil, content: "content">] 
ruby-1.9.2-p180 :003 > c.messages.first.medias
 => [#<Media _id: 4e65c7275d156d0129000003, _type: "Link", created_at: nil, updated_at: nil, message_id: BSON::ObjectId('4e65c7275d156d0129000002'), url: "google.com">] 
ruby-1.9.2-p180 :004 > c.save
 => true 
ruby-1.9.2-p180 :005 > c.reload
 => #<Conversation _id: 4e65c7275d156d0129000001, _type: nil, created_at: 2011-09-06 07:09:33 UTC, updated_at: 2011-09-06 07:09:33 UTC, title: nil> 
ruby-1.9.2-p180 :006 > c.messages
 => [#<Text _id: 4e65c7275d156d0129000002, _type: "Text", created_at: nil, updated_at: nil, content: "content">] 
ruby-1.9.2-p180 :007 > c.messages.first.medias
 => [] #Should not be empty

现在，如果你改变Conversation＆lt; =＆gt;之间的关系消息如下：

A Conversation has_many Messages

完美无缺。一些rails控制台测试也是：

ruby-1.9.2-p180 :002 > c = Conversation.new({:messages_attributes => [{'_type' => 'Text', :content => 'content', :medias_attributes => [{'_type' => 'Link', :url => 'google.com'}]}]})
 => #<Conversation _id: 4e65c6bb5d156d011a000004, _type: nil, created_at: nil, updated_at: nil, title: nil> 
ruby-1.9.2-p180 :003 > c.messages
 => [#<Message _id: 4e65c6bb5d156d011a000005, _type: "Text", created_at: nil, updated_at: nil, conversation_id: BSON::ObjectId('4e65c6bb5d156d011a000004'), content: "content">] 
ruby-1.9.2-p180 :004 > c.messages.first.medias
 => [#<Media _id: 4e65c6bb5d156d011a000006, _type: "Link", created_at: nil, updated_at: nil, message_id: BSON::ObjectId('4e65c6bb5d156d011a000005'), url: "google.com">] 
ruby-1.9.2-p180 :005 > c.save
 => true 
ruby-1.9.2-p180 :006 > c.reload
 => #<Conversation _id: 4e65c6bb5d156d011a000004, _type: nil, created_at: 2011-09-06 07:07:54 UTC, updated_at: 2011-09-06 07:07:54 UTC, title: nil> 
ruby-1.9.2-p180 :007 > c.messages
 => [#<Text _id: 4e65c6bb5d156d011a000005, _type: "Text", created_at: 2011-09-06 07:07:54 UTC, updated_at: 2011-09-06 07:07:54 UTC, conversation_id: BSON::ObjectId('4e65c6bb5d156d011a000004'), content: "content">] 
ruby-1.9.2-p180 :008 > c.messages.first.medias
 => [#<Link _id: 4e65c6bb5d156d011a000006, _type: "Link", created_at: 2011-09-06 07:07:54 UTC, updated_at: 2011-09-06 07:07:54 UTC, message_id: BSON::ObjectId('4e65c6bb5d156d011a000005'), url: "google.com">]

以下是示例zip文件的链接：http://d.pr/oMUc

Answer 1

嗯，这个不太容易^^

但是这里是mongoid的git问题的链接：https://github.com/mongoid/mongoid/issues/1216

对于有同样问题的人！

嵌套引用未使用mongoid从嵌入文档中保存

1 个答案: