activerecord-hackery/squeel — pull request #325 by estum (2014-07-28 02:43:08+00:00)
Title: Fix NoMethodError when calling unscope method

Example:

```ruby
class User < ActiveRecord::Base
scope :with_activity, ->{ where{(active == true) & (posts_count + comments_count >= 1)} }
end

User.with_activity.unscope(where: :active)
# => NoMethodError: undefined method `symbol' for #
# from gems/squeel-1.2.1/lib/squeel/adapters/active_record/4.0/relation_extensions.rb:44:in `block in where_unscoping'
```