Simple ActiveRecord diff functionality.
$ gem install activerecord-diff
require 'active_record/diff'
class User < ActiveRecord::Base
include ActiveRecord::Diff
end
alice = User.create(:name => 'alice', :email_address => 'alice@example.org')
bob = User.create(:name => 'bob', :email_address => 'bob@example.org')
alice.diff?(bob) # => true
alice.diff(bob) # => {:name => ['alice', 'bob'], :email_address => ['alice@example.org', 'bob@example.org']}
alice.diff({:name => 'eve'}) # => {:name => ['alice', 'eve']}
By default, ActiveRecord::Base.content_columns is used to decide which attributes to compare. You can include or exclude attributes from this as follows:
class User < ActiveRecord::Base
diff :include => [:id], :exclude => [:password_hash]
end
Alternatively, you can specify exactly which columns to compare:
class User < ActiveRecord::Base
diff :id, :name, :email_address
end
To the extent possible under law, Tim Fletcher has waived all copyright and related or neighboring rights to activerecord-diff. This work is published from the United Kingdom. http://creativecommons.org/publicdomain/zero/1.0/