activerecord-duplicate

Duplicating ActiveRecords is easy again. All you have to do:

class Post < ActiveRecord::Base
end

post.duplicate

You want more control? Check out this example:

class Post < ActiveRecord::Base
  # Don't duplicate if callback (on original object) returns false!
  before_duplication(on: :original) { self.is_copyrighted? }
  after_duplication(on: :original) { self.inform_author_about_duplicate! }
  
  after_duplication(on: :duplicate) { self.credit_author_in_content! }
  
  has_many :comments
  has_many :tags
  
  # Only these attributes and associations will be duplicated.
  attr_duplicatable :title, :content, :tags
end

class Tag < ActiveRecord::Base
  belongs_to :post
  
  attr_duplicatable :tag, :post
end

class Comment < ActiveRecord::Base
end

# Duplicates non-copyrighted posts and tags as well, but ignores comments.
post.duplicate

Tested against Ruby versions 1.9.2, 1.9.3, ruby-head and Rails versions 3.1.x, 3.2.x, master (upcoming Rails 4.0.0).

In your Gemfile:

gem 'activerecord-duplicate'

1. Fork it
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Added some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create new Pull Request

Copyright (c) 2012 Mario Uher

MIT License

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.