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    <p>I went rooting around the Rails 3.1 source to sort this out, I figured that would be easier than searching anywhere else. Earlier versions of Rails should be similar. Jump to the end if tl;dr.</p> <hr> <p>When you call <code>form_for(@user)</code>, you end going through this:</p> <pre><code>def form_for(record, options = {}, &amp;proc) #... case record when String, Symbol object_name = record object = nil else object = record.is_a?(Array) ? record.last : record object_name = options[:as] || ActiveModel::Naming.param_key(object) apply_form_for_options!(record, options) end </code></pre> <p>And since <code>@user</code> is neither a String nor Object, you go through the <code>else</code> branch and into <code>apply_form_for_options!</code>. Inside <code>apply_form_for_options!</code> we see this:</p> <pre><code>as = options[:as] #... options[:html].reverse_merge!( :class =&gt; as ? "#{as}_#{action}" : dom_class(object, action), :id =&gt; as ? "#{as}_#{action}" : dom_id(object, action), :method =&gt; method ) </code></pre> <p>Pay attention to that chunk of code, it contains both the source of your problem and the solution. The <code>dom_id</code> method calls <code>record_key_for_dom_id</code> which looks like this:</p> <pre><code>def record_key_for_dom_id(record) record = record.to_model if record.respond_to?(:to_model) key = record.to_key key ? sanitize_dom_id(key.join('_')) : key end </code></pre> <p>And there's your call to <code>to_key</code>. The <code>to_key</code> method is defined by <a href="http://api.rubyonrails.org/classes/ActiveRecord/AttributeMethods/PrimaryKey.html"><code>ActiveRecord::AttributeMethods::PrimaryKey</code></a> and since you're not using ActiveRecord, you don't have a <code>to_key</code> method. If you have something in your model that behaves like a primary key then you could define your own <code>to_key</code> and leave it at that.</p> <p>But, if we go back to <code>apply_form_for_options!</code> we'll see another solution:</p> <pre><code>as = options[:as] </code></pre> <p>So you could supply the <code>:as</code> option to <code>form_for</code> to generate a DOM ID for your form by hand:</p> <pre><code>&lt;%= form_for(@user, :as =&gt; 'user_form') do |f| %&gt; </code></pre> <p>You'd have to make sure that the <code>:as</code> value was unique within the page though.</p> <hr> <p><strong>Executive Summary</strong>:</p> <ul> <li>If your model has an attribute that behaves like a primary key, then define your own <code>to_key</code> method that returns it.</li> <li>Or, supply an appropriate <code>:as</code> option to <code>form_for</code>.</li> </ul>
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    1. POActiveModel - View - Controller in Rails instead of ActiveRecord?
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    1. USmu is too short
    1. USmu is too short
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    1. COi'm really thankful for your effort matey! thats brilliant. One small question related to this as well. In case of ActiveRecord I had just added resources :users to my routes.rb file where users was my DB table and it worked out user paths according to id in the database. Now here its ActiveModel I'm using how do I approach defining user paths?
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      1. USBilal Wahla
    2. CO@Bilal: I'm not sure about the routes or which part of Rails or ActiveRecord handles that. I tend to add all my routes by hand and do most of the interaction through AJAX.
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    3. COthanks for this - your :as solution got me past the first error, but now I'm seeing `undefined method `persisted?'`
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      1. USKarl Rosaen
 

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