Rails - Oct 2007 - send("#{attr_name}_before_type_cast").nil? -- does not work!

Hi all

I''m writing a validates_url_format_of validation helper. So far
everything works good, but the 11th line does not work!

---

ActiveRecord::Errors::default_error_messages[:invalid_url_protocol]
''must be using the HTTP or HTTPS protocoll''
ActiveRecord::Errors::default_error_messages[:invalid_url_format] =
''has
an incorrect link format''
module ActiveRecord::Validations::ClassMethods
  def validates_url_format_of(*attr_names)
    configuration = {}
    configuration.update(attr_names.pop) if attr_names.last.is_a?(Hash)

    validates_each(attr_names.first.to_s) do |record, attr_name, value|
      unless configuration[:if] and not
evaluate_condition(configuration[:if], record) # Evaluate :if option
        if record.send("#{attr_name}_before_type_cast").nil? # Is the
URL attribute empty?
          next if configuration[:allow_nil] # Skip this one if emptyness
is allowed
          record.send("#{attr_name}=", ''http://'' +
record.send(attr_name.to_sym)) if record.send(attr_name) !~
/^[a-z]+:\/\// # Add the default protocoll HTTP to the URL if none
specified
        end

        if record.send(attr_name.to_sym) !~ /^(http|https):\/\//i # Only
allow HTTP and HTTPS URL''s
          record.errors.add(attr_name,
ActiveRecord::Errors::default_error_messages[:invalid_url_protocol])
        elsif record.send(attr_name.to_sym) !~
/^(http|https):\/\/([a-z0-9\-äöüèàéê\.]+)(\.[a-z]{2,})(\/(.*))?$/i #
Check if it is a basic valid URL
          record.errors.add(attr_name,
ActiveRecord::Errors::default_error_messages[:invalid_url_format])
        end
      end
    end
  end
end

---

I copied it from another Rails validation helper, so I don''t get it why

if record.send("#{attr_name}_before_type_cast").nil? # Is the URL
attribute empty?

does not work... :-/

Thanks for help. Josh
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