mongoid-embedded_copy

Create a mimic of a root document to use as a copy embedded in another document.

Please report any issue you may find.

If you'd like to contribute, but pull requests are welcome!

gem 'mongoid-embedded_copy'

class User
  include Mongoid::Document
  include Mongoid::EmbeddedCopy

  field :firstname
  # [...]

  has_many :posts
  embeds_copy :last_post, class_name: 'Post'
end

# Then use it
user = User.create
post = Post.create(title: 'Hello World!', user: user)
user.last_post = post

The copy is embedded in the document, so it is much faster to access its values.

For example, you can easily search by users last post date: User.where(:'last_post.created_at'.gt => Date.yesterday).

• You are responsible for keeping the embedded copy up-to-date.
• Setters on the copy also update the original document if update_original option is given.
• The embedded copy has the same ID as the original document, so you can easily find the original, although there is load_original for this purpose.
• You can skip attributes with the :skip options to embeds_copy.
• The relation name is automatically skipped, e.g. user.last_post doesn't have an user_id.
• The class created for a last_post of class Post in a User is named Post::CopyForUser.
• A method named acts_as_#{klass.to_s.underscore} is defined in the copy and original class.
• You can use :embedded_class to specify another name for the copy class.