I've got:
我有：
class Article
include Mongoid::Document
embeds_many :comments
end
class Comment
include Mongoid::Document
embedded_in :article
end
Since Comment is an embedded document in Article. How would I list down ALL Comments in order of created_at?
由于Comment是文章中的嵌入式文档。我如何按create_at的顺序列出所有评论？
Should I structure it so that Comment is not an embedded in Article or is there a way with the above schema?
我应该构建它，以便Comment不是嵌入在文章中，还是有上述架构的方法？
2 个解决方案
#1
1
If you're trying to query comments out of context of their articles, then clearly comment should be a top level entity and not embedded one.
如果您试图在文章的上下文之外查询评论，那么显然评论应该是*实体而不是嵌入式实体。
In embedded case you can use map-reduce or aggregation framework. Regular query language won't help you here.
在嵌入式情况下，您可以使用map-reduce或聚合框架。常规查询语言对您没有帮助。
#2
0
why not just default_scope :order => 'created_at DESC'? (or ASC).
为什么不只是default_scope：order =>'created_at DESC'？ （或ASC）。
You're going to want them to be in a consistent order across the site anyway.
无论如何，您将希望它们在整个站点中保持一致的顺序。
#1
1
If you're trying to query comments out of context of their articles, then clearly comment should be a top level entity and not embedded one.
如果您试图在文章的上下文之外查询评论，那么显然评论应该是*实体而不是嵌入式实体。
In embedded case you can use map-reduce or aggregation framework. Regular query language won't help you here.
在嵌入式情况下，您可以使用map-reduce或聚合框架。常规查询语言对您没有帮助。
#2
0
why not just default_scope :order => 'created_at DESC'? (or ASC).
为什么不只是default_scope：order =>'created_at DESC'？ （或ASC）。
You're going to want them to be in a consistent order across the site anyway.
无论如何，您将希望它们在整个站点中保持一致的顺序。