Hi there,
I’m trying to implement Simply Accessible’s form error messages
advice, explained here:
http://simplyaccessible.org/article/form-error-messages
I’m trying to produce a custom FormBuilder to accomplish this. It’s
based on the TaggedBuilder example in the AWDWR2 book.
Of course, I can’t use error_messages_on inside my FormBuilder, so I
rolled my own method to acquire the first error message (if any) for
an ActiveRecord instance, and was stunned into submission by the
results.
Could someone explain the cause of the HERE comment in my code below,
or suggest another approach?
Thanks,
Sheldon.
#—
Based on:
TaggedBuilder from “Agile Web D. 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 LabellingFormBuilder < ActionView::Helpers::FormBuilder
def first_error_message_on(label)
“”
# HERE Debugging shows @object is always nil at this point,
# even though @object_name is set correctly! So we can’t
# just do:
#
#errors = @object.errors.on(label)
#errors.respond_to? :first ? errors.first : errors
end
Description
is too short
<%= form.text_area ‘description’ %>
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}”) +
“
” +
super,
:class => “labelled-form-input”)
end
end
field_helpers.each do |name|
create_tagged_field(name)
end
end