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    copied!<p>In your <code>_promotion_type</code> partial you are looping through <code>@promotion_types</code> and it sounds like this instance variable is not getting set in the <code>create</code> action.</p> <p>From the name, it sounds like that partial should only display one promotion type, not many. So move the loop outside of the partial. I recommend using the <code>:collection</code> and <code>:object</code> options to pass the model to the partial.</p> <pre><code># index.html.erb &lt;div id="promo_types"&gt; &lt;%= render :partial =&gt; "promotion_type", :collection =&gt; @promotion_types %&gt; &lt;/div&gt; # _promotion_type.html.erb &lt;table&gt; &lt;tr&gt; &lt;td width="200"&gt;&lt;%=h promotion_type.name %&gt;&lt;/td&gt; &lt;td width="20"&gt;&lt;a class="Edit&lt;%=h promotion_type.id %&gt;" href="#"&gt;&lt;img src="/images/pencil.png" alt="Edit" title="Edit" /&gt;&lt;/a&gt;&lt;/td&gt; &lt;td width="20"&gt;&lt;%= link_to(image_tag('/images/bin.png', :alt =&gt; 'Remove', :title =&gt; "Remove"), promotion_type, :class =&gt; "deleteCategory") %&gt;&lt;/td&gt; &lt;/tr&gt; &lt;/table&gt; &lt;div id="popupEdit&lt;%=h promotion_type.id %&gt;" class="popupEdit"&gt; &lt;a class="popupClose&lt;%=h promotion_type.id %&gt;" id="popupClose"&gt;x&lt;/a&gt; &lt;%= render :file =&gt; 'promotion_types/edit' %&gt;&lt;/div&gt; # create.js.erb $("#promo_types").append("&lt;%= escape_javascript(render(:partial =&gt; "promotion_type", :object =&gt; @promotion_type))%&gt;"); </code></pre> <p>As for your second question, yes. You can assign a specific ID to each record and replace that using the <code>.html</code> method.</p> <pre><code># update.js.erb $("#promo_type_&lt;%= @promotion_type.id %&gt;").html("&lt;%= escape_javascript(render(:partial =&gt; "promotion_type", :object =&gt; @promotion_type))%&gt;"); </code></pre>
 

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