A simple plugin which hides records instead of deleting them, being able to recover them.
This branch targets Rails 3.2. If you're working with another version, switch to the corresponding branch.
While porting it to Rails 3, I decided to apply the ideas behind those plugins to an unified solution while removing a lot of the complexity found in them. I eventually ended up writing a new plugin from scratch.
You can enable ActsAsParanoid like this:
class Paranoiac < ActiveRecord::Base acts_as_paranoid end
You can also specify the name of the column to store it's deletion and the type of data it holds:
:column => 'deleted_at'
:column_type => 'time'
The values shown are the defaults. While column can be anything (as long as it exists in your database), type is restricted to:
If your column type is a
string, you can also specify which value to use when marking an object as deleted by passing
:deleted_value (default is "deleted"). Any records with a non-matching value in this column will be treated normally (ie: not deleted).
If a record is deleted by ActsAsParanoid, it won't be retrieved when accessing the database. So,
Paranoiac.all will not include the deleted_records. if you want to access them, you have 2 choices:
Paranoiac.only_deleted # retrieves the deleted records Paranoiac.with_deleted # retrieves all records, deleted or not
When using the default
'time', the following extra scopes are provided:
time = Time.now Paranoiac.deleted_after_time(time) Paranoiac.deleted_before_time(time) # Or roll it all up and get a nice window: Paranoiac.deleted_inside_time_window(time, 2.minutes)
In order to really delete a record, just use:
You can also permanently delete a record by calling
delete_all on it twice. If a record was already deleted (hidden by ActsAsParanoid) and you delete it again, it will be removed from the database. Take this example:
p = Paranoiac.first p.destroy # does NOT delete the first record, just hides it Paranoiac.only_deleted.where(:id => p.id).destroy # deletes the first record from the database
Recovery is easy. Just invoke
recover on it, like this:
Paranoiac.only_deleted.where("name = ?", "not dead yet").first.recover
All associations marked as
:dependent => :destroy are also recursively recovered. If you would like to disable this behavior, you can call
recover with the
Paranoiac.only_deleted.where("name = ?", "not dead yet").first.recover(:recursive => false)
If you would like to change this default behavior for one model, you can use the
class Paranoiac < ActiveRecord::Base acts_as_paranoid :recover_dependent_associations => false end
By default, dependent records will be recovered if they were deleted within 2 minutes of the object upon which they depend. This restores the objects to the state before the recursive deletion without restoring other objects that were deleted earlier. The behavior is only available when both parent and dependant are using timestamp fields to mark deletion, which is the default behavior. This window can be changed with the
class Paranoiac < ActiveRecord::Base acts_as_paranoid has_many :paranoids, :dependent => :destroy end class Paranoid < ActiveRecord::Base belongs_to :paranoic # Paranoid objects will be recovered alongside Paranoic objects # if they were deleted within 10 minutes of the Paranoic object acts_as_paranoid :dependent_recovery_window => 10.minutes end
or in the recover statement
Paranoiac.only_deleted.where("name = ?", "not dead yet").first.recover(:recovery_window => 30.seconds)
ActiveRecord's built-in uniqueness validation does not account for records deleted by ActsAsParanoid. If you want to check for uniqueness among non-deleted records only, use the macro
validates_as_paranoid in your model. Then, instead of using
validates_uniqueness_of_without_deleted. This will keep deleted records from counting against the uniqueness check.
class Paranoiac < ActiveRecord::Base acts_as_paranoid validates_as_paranoid validates_uniqueness_of_without_deleted :name end p1 = Paranoiac.create(:name => 'foo') p1.destroy p2 = Paranoiac.new(:name => 'foo') p2.valid? #=> true p2.save p1.recover #=> fails validation!
You can check the status of your paranoid objects with the
Paranoiac.create(:name => 'foo').destroy Paranoiac.with_deleted.first.deleted? #=> true
As you've probably guessed,
only_deleted are scopes. You can, however, chain them freely with other scopes you might have. This
is exactly the same as
You can work freely with scopes and it will just work:
class Paranoiac < ActiveRecord::Base acts_as_paranoid scope :pretty, where(:pretty => true) end Paranoiac.create(:pretty => true) Paranoiac.pretty.count #=> 1 Paranoiac.only_deleted.count #=> 0 Paranoiac.pretty.only_deleted.count #=> 0 Paranoiac.first.destroy Paranoiac.pretty.count #=> 0 Paranoiac.only_deleted.count #=> 1 Paranoiac.pretty.only_deleted.count #=> 1
Associations are also supported. From the simplest behaviors you'd expect to more nifty things like the ones mentioned previously or the usage of the
:with_deleted option with
class ParanoiacParent < ActiveRecord::Base has_many :children, :class_name => "ParanoiacChild" end class ParanoiacChild < ActiveRecord::Base belongs_to :parent, :class_name => "ParanoiacParent" belongs_to :parent_with_deleted, :class_name => "ParanoiacParent", :with_deleted => true end parent = ParanoiacParent.first child = parent.children.create parent.destroy child.parent #=> nil child.parent_with_deleted #=> ParanoiacParent (it works!)
Watch out for these caveats:
- You cannot use scopes named
- You cannot use scopes named
deleted_after_timeif your paranoid column's type is
unscopedwill return all records, deleted or not
This gem supports the most recent versions of Rails and Ruby.
For Rails 3.2 check the README at the rails3.2 branch and add this to your Gemfile:
gem "acts_as_paranoid", "~>0.4.0"
For Rails 3.1 check the README at the rails3.1 branch and add this to your Gemfile:
gem "rails3_acts_as_paranoid", "~>0.1.4"
For Rails 3.0 check the README at the rails3.0 branch and add this to your Gemfile:
gem "rails3_acts_as_paranoid", "~>0.0.9"
This gem is tested on Ruby 1.9, JRuby and Rubinius (both in 1.9 mode). It might work fine in 1.8, but it's not officially supported.
- To cheerfulstoic for adding recursive recovery
- To Jonathan Vaught for adding paranoid validations
- To Geoffrey Hichborn for improving the overral code quality and adding support for after_commit
- To flah00 for adding support for STI-based associations (with :dependent)
- To vikramdhillon for the idea and initial implementation of support for string column type
- To Craig Walker for Rails 3.1 support and fixing various pending issues
- To Charles G. for Rails 3.2 support and for making a desperately needed global code refactoring
Copyright © 2010 Gonçalo Silva, released under the MIT license