Paranoid Documents for Mongoid

Mongoid::Paranoia enables a "soft delete" of Mongoid documents. Instead of being removed from the database, paranoid docs are flagged with a deleted_at timestamp and are ignored from queries by default.

The Mongoid::Paranoia functionality was originally supported in Mongoid itself, but was dropped from version 4.0.0 onwards. This gem was extracted from the Mongoid 3.0.0-stable branch. This gem should not be used with Mongoid versions 3.x and prior. Current master branch targeted on Mongoid 6.0. With release 0.3.0 Mongoid 4 and 5 versions will be dropped.

Caution: This repo/gem mongoid_paranoia (underscored) is different than mongoid-paranoia (hyphenated). The goal of mongoid-paranoia (hyphenated) is to stay API compatible and it only accepts security fixes.

Installation

Add this line to your application's Gemfile:

gem 'mongoid_paranoia'

Usage

class Person
  include Mongoid::Document
  include Mongoid::Paranoia
end

person.delete   # Sets the deleted_at field to the current time, ignoring callbacks.
person.delete!  # Permanently deletes the document, ignoring callbacks.
person.destroy  # Sets the deleted_at field to the current time, firing callbacks.
person.destroy! # Permanently deletes the document, firing callbacks.
person.restore  # Brings the "deleted" document back to life.
person.restore(:recursive => true) # Brings "deleted" associated documents back to life recursively

The documents that have been "flagged" as deleted (soft deleted) can be accessed at any time by calling the deleted class method on the class.

Person.deleted # Returns documents that have been "flagged" as deleted.

You can also access all documents (both deleted and non-deleted) at any time by using the unscoped class method:

Person.unscoped.all # Returns all documents, both deleted and non-deleted

You can also configure the paranoid field naming on a global basis. Within the context of a Rails app this is done via an initializer.

# config/initializers/mongoid_paranoid.rb

Mongoid::Paranoia.configure do |c|
  c.paranoid_field = :myFieldName
end

Validations

You need override uniqueness validates

validates :title, uniqueness: { conditions: -> { where(deleted_at: nil) } }

Callbacks

Restore

before_restore, after_restore and around_restore callbacks are added to your model. They work similarly to the before_destroy, after_destroy and around_destroy callbacks.

Remove

before_remove, after_remove and around_remove are added to your model. They are called when record is deleted permanently .

Example

class User
  include Mongoid::Document
  include Mongoid::Paranoia

  before_restore :before_restore_action
  after_restore  :after_restore_action
  around_restore :around_restore_action

  private

  def before_restore_action
    puts "BEFORE"
  end

  def after_restore_action
    puts "AFTER"
  end

  def around_restore_action
    puts "AROUND - BEFORE"
    yield # restoring
    puts "AROUND - AFTER"
  end
end

TODO

• get rid of monkey_patches.rb
• review persisted? behaviour

Authors

• original Mongoid implementation by @durran
• extracted from Mongoid by @simi
• documentation improvements by awesome @loopj
• latest mongoid support, restore_callback support by fabulous @zhouguangming

Contributing

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