Atomically remove embedded doc from doc in mongomapper

atomic_embedded_pull.rb

require 'pp'
require 'rubygems'
require 'mongo_mapper'

MongoMapper.database = 'testing'

class Comment
  include MongoMapper::EmbeddedDocument
end

class Post
  include MongoMapper::Document
  many :comments do
    def destroy(id)
      proxy_owner.pull(:comments => {:_id => id})
    end
  end
end
Post.delete_all

comment = Comment.new(:name => 'Peter')
post = Post.create(:title => "Foo", :comments => [comment, Comment.new(:name => 'John')])

pp Post.collection.find.to_a

post.comments.destroy(comment.id)

pp Post.collection.find.to_a