Complex forms + DHH's auto_complete plugin = works!

I've been searching for a way to get DHH's auto_complete plugin to work with Ryan Bates' complex forms. All I could find was people asking the same question, but no solutions so I decided to try it myself. I don't know if this id the best way to do it, but the solution was to monkey patch ActionView::FormHelper and FormBuilder which I put in a seperate file in the /lib folder of my project. Here's the code:

## lib/auto_complete_form_helper.rb module ActionView   module Helpers     module FormHelper       def text_field_with_auto_complete_mod(object, method, tag_options = {}, completion_options = {})         sanitized_object = object.gsub(/\]\[|[^-a-zA-Z0-9:.]/, "_").sub (/_$/, "")         sanitized_method = method.to_s.sub(/\?$/,"")         (completion_options[:skip_style] ? "" : auto_complete_stylesheet) +         text_field(object, method, tag_options) +         content_tag("div", "", :id => "#{sanitized_object}_# {sanitized_method}_auto_complete", :class => "auto_complete") +         auto_complete_field("#{sanitized_object}_#{sanitized_method}", { :url => { :action => "auto_complete_for_#{sanitized_object}_# {sanitized_method}" } }.update(completion_options))       end     end

    class FormBuilder       def text_field_with_auto_complete(method, tag_options = {}, completion_options = {})         @template.text_field_with_auto_complete_mod(@object_name, method,           objectify_options(tag_options), completion_options)       end     end   end end

Don't forget to include the file in your environment.rb of course. I know some people were looking for a way to get this to work, so I thought it might be helpful if I post it on the mailing list. If you see any bugs or know of a better way, please let me know.

Ooh, that code isn't too readable. Um, I posted it on my website as well:

Hi... I wrote some similar code, and packaged it up into a plugin. See: The auto_complete plugin refactored to support repeated fields and named scopes - Pat Shaughnessy

I also know there are a few other forks of the auto_complete plugin that also solve this same problem, for example:

Or just look through the auto_complete forks on github:

Hope this helps, - pat

Hmm, maybe we could some parts together. I like the one in the second link, but looking at the code, I think there's more extra in there. I would still need to check it out more thoroughly.

One thing I would like to do is extend the autocomplete functionality to autocomplete for a whole object.

eg: If you have an Address model which contains street, city, region, zip. In a form you start typing the street and the autocomplete popup comes up with the full address. When you choose the address, it automatically fills in all the fields for the address. Has anybody done that yet and is it possible to do it easily with Prototype?