Acts As Versionable¶ ↑

Minimalist versionable engine for rails > 3

Maintains versions in same table, just adding two new fields

Installation¶ ↑

gem 'acts_as_versionable'

add two fields to your model

version_number:integer
version_id:integer

**Sample migration**

class ActsAsVersionableDocuments < ActiveRecord::Migration
  def self.up
    add_column :documents, :version_number, :default => 0
    add_column :documents, :version_id, :default => null

    # optional indexes
    add_index :documents, :version_number, :name => "index_documents_on_version_number"
    add_index :documents, :version_id, :name => "index_documents_on_version_id"
    # optional unique :id, :version_number
  end

  def self.down
    remove_column :documents, :version_number
    remove_column :documents, :version_id
  end
end

Example¶ ↑

class Document < ActiveRecord::Base
  acts_as_versionable :max_versions => 5
end

# by default max_versions is 10

# use scope to get top versions   
documents = Document.last_versions     => scope that return most recent versions

# create first version    
document = Document.create(:title => 'title', :body => 'body')
document.version => 1
document.last_version => 1

# modify
document.title = 'new title'
document.save => true

# new version was created
document.version => 2
document.last_version => 2
document.versions => Array(2)

# revert to version 1
document.revert_to_version(1) => #<Document ...>
document.version => 3 # after revert a new version is created with content of version 1
document.title => 'title'

# get a version       
version2 = document.get_version 2 => #<Document ... version_number => 2>  
version2.version => 2 
version2.title => 'new title"     
version2.last_version => 4

# you can't edit a version
version2 = document.get_version 2 
version2.title = "new version"
version2.save => raise NonEditableVersionError

version2.versionable? => false

# to edit a version you need get the editable_version
editable = version2.editable_version
editable.versionable? => true
editable.title = "new"
editable.save
editable.last_version => 5

How to contribute¶ ↑

If you find what you might think is a bug:

Check the GitHub issue tracker to see if anyone else has had the same issue. github.com/csegura/acts_as_versionable/issues/
If you don’t see anything, create an issue with information on how to reproduce it.

If you want to contribute an enhancement or a fix:

Fork the project on github. github.com/csegura/acts_as_versionable/
Make your changes with tests.
Commit the changes without making changes to the Rakefile, VERSION, or any other files that aren’t related to your enhancement or fix
Send a pull request.