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Ignore columns in ActiveRecord

Add this to your Gemfile:

gem 'ignorable'

class Topic < ActiveRecord::Base
   ignore_columns :attributes, :class, :meta_column_used_by_another_app
end

Tested on Rails 3.2, Rails 4.1.0.

This gem is not needed on Rails 5.0 because an ignored_columns feature has been merged in rails/rails#21720