mongoid-undo

Super simple undo for your Mongoid app, based on both great modules Mongoid::Paranoia and Mongoid::Versioning.

How does it work?

  • Mongoid::Paranoia is used to mark documents as deleted, instead of deleting them really, otherwise restoring would be impossible ;).
  • Mongoid::Versioning is used to keep the older versions of your document, so we can restore them.
  • Mongoid::Undo adds an action field to your documents, so we can easily determine whether it was created, updated, or destroyed.

But instead of explaining all the details, you should get the idea by looking at the Usage section.

Installation

In your Gemfile:

gem 'mongoid-undo'

Usage

class Document
  include Mongoid::Document
  include Mongoid::Undo
end

Creating (and undoing)

document = Document.create
document.persisted? #=> true

document.undo
document.persisted? #=> false

document.redo # A nice alias for undo ;)
document.persisted? #=> true

Updating (and undoing)

document = Document.create(name: 'foo')

document.undoable? # => false
document.save
document.undoable? # => false

document.update_attributes(name: 'bar')
document.undoable? # => true
document.name #=> 'bar'

document.undo
document.name #=> 'foo'

document.redo
document.name #=> 'bar'

Destroying (and undoing)

document = Document.first

document.destroy
document.persisted? #=> false

document.undo
document.persisted? #=> true

document.redo
document.persisted? #=> false

Callbacks

Mongoid::Undo defines two callbacks which are called before and after undo, respectively redo. Both are based on ActiveModel::Callbacks which means they behave like the allready known Rails callbacks.

class Document
  include Mongoid::Document
  include Mongoid::Undo

  before_undo do
    # Do something fancy.
  end

  before_redo { false } # Don't allow redoing.
end

Contributing

  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

(The MIT license)

Copyright (c) 2012 - 2014 Mario Uher

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.