Atomically archive object trees in your activerecord models.
We had the problem that acts_as_paranoid and similar plugins/gems always work on a record-by-record basis and made it very difficult to restore records atomically (or archive them, for that matter).
Because the archive and unarchive methods are in transactions, and every archival record involved gets the same archive number upon archiving, you can easily restore or remove an entire set of records without having to worry about partial deletion or restoration.
Additionally, other plugins generally screw with how
delete work. We don't because we actually want to be able
to destroy records.
You might read the commit logs and think "This must be abandonware! This hasn't been updated in 2y!" But! This is a mature project that solves a specific problem in ActiveRecord. It tends to only be updated when a new major version of ActiveRecord comes out and hence the infrequent updates.
Any models you want to be archival should have the columns
archive_number (String) and
rails g migration AddAAAToPost archive_number archived_at:datetime
Any dependent-destroy AAA model associated to an AAA model will be archived with its parent.
If you're stuck on Rails 4.0x/3x/2x, check out the older tags/branches, which are no longer in active development.
class Hole < ActiveRecord::Base acts_as_archival has_many :rats, :dependent => :destroy end class Rat < ActiveRecord::Base acts_as_archival end
Simple interactions & scopes
h = Hole.create # h.archived? # => false h.archive # => true h.archived? # => true h.archive_number # => "b56876de48a5dcfe71b2c13eec15e4a2" h.archived_at # => Thu, 01 Jan 2012 01:49:21 -0400 h.unarchive # => true h.archived? # => false h.archive_number # => nil h.archived_at # => nil
h = Hole.create # r = h.rats.create # h.archive # => true h.archive_number # => "b56876de48a5dcfe71b2c13eec15e4a2" r.archived_at # => Thu, 01 Jan 2012 01:52:12 -0400 r.archived? # => true h.unarchive # => true h.archive_number # => nil r.archived_at # => nil r.archived? # => false
h = Hole.create Hole.archived.size # => 0 Hole.unarchived.size # => 1 h.archive Hole.archived.size # => 1 Hole.unarchived.size # => 0
h = Hole.create # h.is_archival? # => true Hole.is_archival? # => true
When defining an AAA model, it is is possible to make it unmodifiable
when it is archived by passing
:readonly_when_archived => true to the
acts_as_archival call in your model.
class CantTouchThis < ActiveRecord::Base acts_as_archival :readonly_when_archived => true end record = CantTouchThis.create(:foo => "bar") record.archive # => true record.foo = "I want this to work" record.save # => false record.errors.full_messages.first # => "Cannot modify an archived record."
AAA models have four additional callbacks to do any necessary cleanup or other processing before and after archiving and unarchiving, and can additionally halt the archive callback chain.
class Hole < ActiveRecord::Base acts_as_archival before_archive :some_method_before_archiving after_archive :some_method_after_archiving before_unarchive :some_method_before_unarchiving after_unarchive :some_method_before_unarchiving # ... implement those methods end
Halting the callback chain
- Rails 4.1/4.2 - the callback method should return a
- Rails 5x - the callback should
- This will only work on associations that are dependent destroy. It should be trival to change that or make it optional.
- If you would like to work on this, you will need to setup sqlite, postgres, and mysql on your development machine. Alternately, you can disable specific dev dependencies in the gemspec and test_helper and ask for help.
Running the tests should be as easy as:
script/setup # bundles, makes databases with permissions rake # run tests on latest Rails appraisal rake # run tests on all versions of Rails
Check out more on appraisal if you need to add new versions of things or run into a version bug.
We'd love to have your help making this better! If you have ideas for features this should implement or you think the code sucks, let us know. And PRs are greatly appreciated.
ActsAsParanoid and PermanentRecords were both inspirations for this:
- Joel Meador
- Michael Kuehl
- Matthew Gordon
- Vojtech Salbaba
- David Jones
- Dave Woodward
- Miles Sterrett
- James Hill
- Maarten Claes
- Anthony Panozzo
- Aaron Milam
Copyright (c) 2009-2016 Expected Behavior, LLC, released under the MIT license