conditions_tables matches date ranges

ActiveRecord::Associations::ClassMethods#conditions_tables matches ranges in conditions. When you have a range in your conditions, say for example of 1.month.ago..Time.now, it returns [.].

Example:

>> User.first.logins.conditions_tables(:conditions => {:created_at => 1.month.ago...Time.now})
=> ["logins", "UTC.."]

This regexp is to blame:

conditions.join(' ').scan(/([\.a-zA-Z_]+).?\./).flatten

I'm working on a patch.