mirego/microscope — pull request #1 by remiprev (2013-07-05 21:21:31+00:00)
Title: Add support for :excluded_columns option

```ruby
class User < ActiveRecord::Base
acts_as_microscope, excluded_columns: [:updated_at]
end

User.created_before(2.months.ago) # works!
User.updated_before(2.months.ago) # NoMethodError
```