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    <p>First of all, your idea to isolate this code in a gem/railtie/engine is excellent. I think your best bet may be to monkey patch the form_for method and stick in the extra field. Regarding the on-submit trigger, if you're on Rails 3.1 and are using the asset pipeline, you can have the gem serve javascript as well, although that would require a small change in your <code>application.js</code> to require the gem's js file, e.g. <code>require 'promo/application.js</code>, if the gem were called "promo".</p> <p>Take a look at the docs for <a href="http://api.rubyonrails.org/classes/ActionView/Helpers/FormHelper.html#method-i-form_for-label-Customized+form+builders" rel="nofollow">Customized Form Builder</a></p> <p>Here's some rough idea how this could work, although I haven't tried this code. I'd put this in the promo.rb file that sub-classes <code>Railtie</code> or <code>Engine</code>.</p> <pre><code>ActiveSupport.on_load(:action_view) do module ActionView module Helpers module FormHelper extend ActiveSupport::Concern included do alias_method_chain :form_for, :promo_code end module InstanceMethods def form_for_with_promo_code(record, options = {}, &amp;proc) output = form_for_without_promo_code(record, options.merge(builder: FormBuilderWithPromoCode), proc) # See file: actionpack-3.1.3/lib/action_view/helpers/form_helper.rb for details # the output will have "&lt;/form&gt;" as the last thing, strip that off here and inject your input field promo_field = content_tag :input, name: 'promo_code' # you can also run this through the proc if you want access to the object output.sub(%r{&lt;/form&gt;$},promo_field+'&lt;/form&gt;') end end end end end end </code></pre> <p>Down the road, esp. if your marketing department may run more campaigns, you may even want to change the app's forms, to point to a specific builder that you can override from a gem without the monkey patching here.</p>
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    1. POHow to add extra form fields outside the form declaration block
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    1. USWolfram Arnold
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    1. COThanks for pointing in the "Customized Form Builder" direction. Your answer is the closest to what I want. I think I'll write a custom form builder that adds hidden field (similar in idea to "_method") and add a rack middleware that checks for that field and triggers additional methods in my Engines/plugins.
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    2. CODiving deeper in the Rails code I found `extra_tags_for_form` method that adds `authenticity_token` tags. I'll submit a pull request that will allow other methods to add additional tags. But I got a feeling this should have already been done by smarter people than myself. Is there way to add a tag to all forms (the way `protect_from_forgery` does)?
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    3. CO@Uzbekjon I had the same thought, but I couldn't find a hook for that. I was thinking of hacking fields_for to do this, but it wasn't obvious that this wouldn't have side effects. I'm as surprised as you are that this hasn't been done. I also checked the `simple_form` code, but the just wrap the native form helpers and set up their own API.
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