module Devise::Models

def add_error_on(record, attribute, error, add_default=true)

Wraps add error logic in a method that works for different frameworks. 
def add_error_on(record, attribute, error, add_default=true)
  options = add_default ? { :default => error.to_s.gsub("_", " ") } : {}
  begin
    record.errors.add(attribute, error, options)
  rescue ArgumentError
    record.errors.add(attribute, error.to_s.gsub("_", " "))
  end
end