Mongodb Versioning

doc.json

{
  "title": "Creating great content",
  "content": "Ive got nothing",
  "comments": [
  ]
  "version": 2
  "versions": [
    { "title": "Creating great content", "version": 1 }
  ]
}

doc1.json

{
  "title": "Creating great content",
  "content": "Ive got nothing",
  "comments": [
    { "user": "chuck", "content": "Profound words" }
  ]
  "version": 2
  "versions": [
    { "title": "Creating great content", "version": 1 }
  ]
}

model.rb

class Post
  include Mongoid::Document
  include Mongoid::Versioning

  field :title
  field :content
  
  embeds_many :comments
end 

class Comment
  include Mongoid::Document
  
  field :user
  field :content

  embedded_in :post, :inverse_of => :comments
end

operation.rb

post = Post.create(:title => "Creating great content")
# Now I want to publish it
post.content = "Ive got nothing"
post.save

operation1.rb

post = Post.find(:first, :conditions => {:title => "Creating great content"})
post.comments << Comment.create(:user => "chuck", :content => "Profound words")

operation2.rb

post = Post.where(:first, :conditions => {:title => "Creating great content"})
post.comments.build(:user => "lucy", :content => "blah")
post.save

skip.rb

# Skip Versioning
Post.skip_callback(:before, :save, :revise)

# Turn it back on
Post.set_callback(:before, :save, :revise)