single table inheritance with embeds_one mogoid
I have a model
class Post
include Mongoid::Document
include Mongoid::Timestamps
embeds_one :comment
end
and I have comment class
class Comment
include Mongoid::Document
include Mongoid::Timestamps
embedded_in :post
field :title
field :description
end
And I have another class inherited from comment
class RecentComment < Comment
# certain methods
end
Now I want to be able to create RecentComment
through post
if I do Post.last.build_comment(:_type => "RecentComment")
the new comment will not be of _type:"RecentComment"
, and similarly if I do Post.last.build_recent_comment
, it gives me error saying sth like undefined method build_recent_comment for Post class
. If the post
had references_many :comments
I should have done Post.last.build_开发者_StackOverflowcomments({}, RecentComment)
without any problems. But I don't know about how to build an object with RecentComment
class in this case. If anybody could help that'd be gr8!
Note: I am using gem 'mongoid', '~> 2.0.1'
Maybe try
class Post
include Mongoid::Document
include Mongoid::Timestamps
embeds_one :recent_comment, :class_name => Comment
and just make your Comment class polymorphic
class Comment
include Mongoid::Document
include Mongoid::Timestamps
field :type
validates_inclusion_of :type, :in => ["recent", "other"]
one option is to try something like:
class RecentComment < Comment
store_in "comment"
#set the type you want
end
but you might just use timestamps and scope to retrieve your recent, old comment, new_comment and such,
like within the comment class
scope :recent, where("created_at > (Time.now - 1.day)")
then you can do:
post.comments.recent
精彩评论