In frustration of Mongoid::Versioning, I created this plugin for tracking historical changes for any document, including embedded ones. It achieves this by storing all history tracks in a single collection that you define. (See Usage for more details) Embedded documents are referenced by storing an association path, which is an array of document_name and document_id fields starting from the top most parent document and down to the embedded document that should track history.
This plugin implements multi-user undo, which allows users to undo any history change in any order. Undoing a document also creates a new history track. This is great for auditing and preventing vandalism, but it is probably not suitable for use cases such as a wiki.
gem install mongoid-history
In your Gemfile:
Here is a quick example on how to use this plugin. For more details, please look at spec/integration/integration_spec.rb. It offers more detailed examples on how to use Mongoid::History.
Create a History Tracker
Create a new class to track histories. All histories are stored in this tracker. The name of the class can be anything you like. The only requirement is that it includes `Mongoid::History::Tracker`
# app/models/history_tracker.rb class HistoryTracker include Mongoid::History::Tracker end
Set Tracker Class Name
You should manually set the tracker class name to make sure your tracker can be found and loaded properly. You can skip this step if you manually require your tracker before using any trackables. If you don't know what I'm talking about, then you should just follow the example below.
Here is an example of setting the tracker class name using a rails initializer
# config/initializers/mongoid-history.rb # initializer for mongoid-history # assuming HistoryTracker is your tracker class Mongoid::History.tracker_class_name = :history_tracker
Create Trackable classes and objects
class Post include Mongoid::Document include Mongoid::Timestamps # History tracking all Post Documents # Note: Tracking will not work until #track_history is invoked include Mongoid::History::Trackable field :title field :body field :rating embeds_many :comments # Telling Mongoid::History how you want to track track_history :on => [:title, :body], # I want to track title and body fields only. Default is :all :modifier_field => :modifier, # Adds "referened_in :modifier" to track who made the change. Default is :modifier :version_field => :version, # Adds "field :version, :type => Integer" to track current version. Default is :version :track_create => false, # Do you want to track document creation? Default is false :track_update => true, # Do you want to track document updates? Default is true :track_destroy => false, # Do you want to track document destruction? Default is false end class Comment include Mongoid::Document include Mongoid::Timestamps # Declare that we want to track comments include Mongoid::History::Trackable field :title field :body embedded_in :post, :inverse_of => :comments # Track title and body for all comments, scope it to post (the parent) # Also track creation and destruction track_history :on => [:title, :body], :scope => :post, :track_create => true, :track_destroy => true end # The modifier can be specified as well class User include Mongoid::Document include Mongoid::Timestamps field :name end user = User.create(:name => "Aaron") post = Post.create(:title => "Test", :body => "Post", :modifier => user) comment = post.comments.create(:title => "test", :body => "comment", :modifier => user) comment.history_tracks.count # should be 1 comment.update_attributes(:title => "Test 2") comment.history_tracks.count # should be 2 track = comment.history_tracks.last track.undo! user # comment title should be "Test" track.redo! user # comment title should be "Test 2" # undo last change comment.undo! user # undo versions 1 - 4 comment.undo! user, :from => 4, :to => 1 # undo last 3 versions comment.undo! user, :last => 3 # redo versions 1 - 4 comment.redo! user, :from => 1, :to => 4 # redo last 3 versions comment.redo! user, :last => 3 # delete post post.destroy # undelete post post.undo! user # disable tracking for comments within a block Comment.disable_tracking do comment.update_attributes(:title => "Test 3") end
Contributing to mongoid-history
Check out the latest master to make sure the feature hasn't been implemented or the bug hasn't been fixed yet
Check out the issue tracker to make sure someone already hasn't requested it and/or contributed it
Fork the project
Start a feature/bugfix branch
Commit and push until you are happy with your contribution
Make sure to add tests for it. This is important so I don't break it in a future version unintentionally.
Please try not to mess with the Rakefile, version, or history. If you want to have your own version, or is otherwise necessary, that is fine, but please isolate to its own commit so I can cherry-pick around it.
Copyright © 2011 Aaron Qian. See LICENSE.txt for further details.