Added check in generate_validations to ensure that the object respond…

…s to _validators; some forms can be built around non ActiveModel objects (eg Authlogic::Session::Base)

lib/better_form/builder.rb

@@ -44,6 +44,10 @@ def generate_label(method, label)
 
     def generate_validations(object, attribute)
       validations = {}
+
+      # Don't try to add validations for an object that doesn't have _validators
+      return {} unless object.respond_to?(:_validators)
+
       # Iterate over each validator for this attribute, and add the appropriate HTML5 data-* attributes
       object._validators[attribute].each do |validator|
         validation = case validator