require 'mongoid'
Mongoid.configure do |config|
  config.master = Mongo::Connection.new.db("foo_#{Time.now.to_i}")
end

class Project
  include Mongoid::Document

  field :name
  field :state, :default => 'active'

  # Comment 1 line and it works, both fails:
  default_scope where(:state => 'active')
  scope :inactive, any_in(:state => [:done, :wip])

end

NoMethodError: undefined method `has_key?' for "active":String
    from /usr/lib/ruby/gems/1.9.1/gems/mongoid-2.3.2/lib/mongoid/criteria.rb:402:in `block (2 levels) in update_selector'
    from /usr/lib/ruby/gems/1.9.1/gems/mongoid-2.3.2/lib/mongoid/criteria.rb:398:in `each_pair'
    from /usr/lib/ruby/gems/1.9.1/gems/mongoid-2.3.2/lib/mongoid/criteria.rb:398:in `block in update_selector'
    from /usr/lib/ruby/gems/1.9.1/gems/mongoid-2.3.2/lib/mongoid/criteria.rb:396:in `tap'
    from /usr/lib/ruby/gems/1.9.1/gems/mongoid-2.3.2/lib/mongoid/criteria.rb:396:in `update_selector'
    from /usr/lib/ruby/gems/1.9.1/gems/mongoid-2.3.2/lib/mongoid/criterion/inclusion.rb:184:in `in'
    from /usr/lib/ruby/gems/1.9.1/gems/mongoid-2.3.2/lib/mongoid/finders.rb:15:in `any_in'