Rails - Jan 2007 - Accessing error messages in a custom FormBuilder

Hi there,

I''m trying to create a FormBuilder called LabellingBuilder, to
implement Simply Accessible''s form error messages strategy:

http://simplyaccessible.org/article/form-error-messages

The problem is that
ActionView::Helpers::ActiveRecordHelper#error_messages_on isn''t
available in subclasses of ActionView::Helpers::FormBuilder.

So I tried to write my own little error fetcher and was stunned by the
results -- while @object_name is correctly set, @object is nil, as
indicated by the XXX comment in the code below.

Can anyone help me with this code?

#---
# Based on:
# TaggedBuilder from "Agile Web Development with Rails, 2nd Ed."
# We make no guarantees that this code is fit for any purpose.
# Visit http://www.pragmaticprogrammer.com/titles/rails2 for more
# book information.
#
class LabellingBuilder < ActionView::Helpers::FormBuilder

  def first_error_message_on(label)
    ""
    # XXX @object is always nil
    #errors = @object.errors.on(label)
    #errors.respond_to? :first ? errors.first : errors
  end

  #  <div class="labelled-form-input">
  #    <label for="product_description">
  #      Description
  #      <em>is too short</em>
  #    </label>
  #    <br/>
  #    <%= form.text_area ''description''  %>
  #  </div>
  def self.create_tagged_field(method_name)
    define_method(method_name) do |label, *args|
      @template.content_tag("div",
        @template.content_tag("label",
          label.to_s.humanize +
          @template.content_tag("em",
            first_error_message_on(label)),
          :for => "#{@object_name}_#{label}") +
        "<br/>" +
        super,
        :class => "labelled-form-input")
    end
  end

  field_helpers.each do |name|
    create_tagged_field(name)
  end

end
#---

Thanks in advance,
Sheldon.


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