I create dynamic attributes and some of them have spaces or other unicode characters not compatible with ruby identifier syntax for naming methods. For example, i have a dynamic attribute named 'phone number 2'. Using define_method, there is no problem defining any type of method which uses this name. However, in Mongoid, it uses class_eval which causes my application to crash:

def define_dynamic_before_type_cast_reader(name)
  class_eval <<-READER
   def #{name}_before_type_cast
     attribute_will_change!(#{name.inspect})
    read_attribute_before_type_cast(#{name.inspect})
  end
  READER
end

Now I cannot use form builder elements like f.text_field 

Is there any temporary solution around this bug?