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    <p>If you don't want to muck up your user model with the promocode attribute, I think you can use the <a href="http://api.rubyonrails.org/classes/ActionView/Helpers/FormTagHelper.html#M001731" rel="nofollow noreferrer"><code>text_field_tag</code></a> (and corresponding [<code>label_tag</code>]) from within your <code>form_for</code>. Something like:</p> <pre><code>&lt;% form_for @user do |f| %&gt; &lt;%= f.error_messages %&gt; &lt;%= label_tag "promo_key" %&gt; &lt;%= text_field_tag "promo_key" %&gt; &lt;%= f.label :login, 'Login' %&gt; &lt;%= f.text_field :login %&gt; &lt;%# ...other fields go here... %&gt; &lt;%= f.submit 'Signup!' %&gt; &lt;% end %&gt; </code></pre> <p>Then, in your controller's create action, you can simply access the entered promo code by checking <code>params[:promo_code]</code>.</p> <pre><code>def create @user = User.new(params[:user]) #build up the user object promo_code = PromoCodes.find_by_name(params[:promo_code]) #find the promo code that user entered if promo_code.allow_reg == 0 #make sure that the code has uses left flash[:notice] = "That promo code has expired. Whoops!" render :action =&gt; 'new' else if @user.save #i assume you want to decrement the allow_reg on a successful registration? promo_code.update_attribute :allow_reg, promo_code.allow_reg - 1 flash[:notice] = "User account created! Please log in with your new account" redirect_to login_url else render :action =&gt; 'new' #user couldn't be saved. validation error? end end end </code></pre> <p>Would that work too? (I'd probably consider moving the promocode checking out of the create action and into a before filter, to keep things cleaner.)</p> <p>-John</p>
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