Mongoid querying - ruby-on-rails-3

Question

I have some application on RoR with Mongodb database. I use Mongoid mapper. Model post.rb
class Post
include Mongoid::Document
field :title, :type => String
field :text, :type => String
embeds_many :comments
end
Model comment.rb
class Comment
include Mongoid::Document
field :name, :type => String
field :content, :type => String
embedded_in :post, :inverse_of => :comments
end
In database this post with some comment has next structure:
{
"_id": ObjectId("4ecbeacf65430f0cef000003"),
"comments": {
"0": {
"name": "my name",
"content": "example content",
"_id": ObjectId("4ecbead365430f0cef000005")
},
"1": {
"name": "some name",
"content": "example content",
"_id": ObjectId("4ecbead665430f0cef000007")
},
"2": {
"name": "some name",
"content": "example content",
"_id": ObjectId("4ecbeada65430f0cef000009")
}
},
"text": "example text",
"title": "example title"
}
And, for example, in database was a few posts with my comments.
I need to find all posts, where "name": "my name", i.e. I need to find all editable by me posts.

Answer 1

It should appear as a array of comments instead of a hash. See my example below.
Also, as per the mongoid docs use the new style field declarations.
comment.rb:
class Comment
include Mongoid::Document
field :name, type: String
field :content, type: String
embedded_in :post
end
post.rb:
class Post
include Mongoid::Document
field :title, type: String
field :text, type: String
embeds_many :comments
end
Rails Console:
p = Post.new(:title => "title", :text => "post")
c1 = Comment.new(:name => "Tyler", :comment => "Awesome Comment!")
c2 = Comment.new(:name => "Joe", :comment => "comment 2")
p.comments << c1
p.comments << c2
p.save
Mongo Console:
> db.posts.findOne()
{
"_id" : ObjectId("4ecd151d096f762149000001"),
"title" : "title",
"text" : "post body",
"comments" : [
{
"name" : "Tyler",
"comment" : "Awesome Comment!",
"_id" : ObjectId("4ecd1569096f762149000002")
},
{
"name" : "Joe",
"comment" : "comment 2",
"_id" : ObjectId("4ecd157f096f762149000003")
}
]}
Then, to do the query you want, which I think was "comments posted by me?":
> db.posts.findOne({"comments.name": "Tyler"})
Also, I would add an index to the comments.name field:
> db.posts.ensureIndex({"comments.name": 1})