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POrender :update gives MissingTemplate error
 

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  1. POrender :update gives MissingTemplate error
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    <p>I'm trying to get a non-model form_for to reload if the validation fails. The page containing the form (app/views/sites/devices.html.erb) contains the code to load the form as a template</p> <pre><code>&lt;div id="site-device-form"&gt; &lt;%= render partial: "shared/site_device_form", locals: {site: @site, site_device: @site_device} %&gt; &lt;/div&gt; </code></pre> <p>and the form then appears inline as a rendered partial:</p> <pre><code>&lt;%= form_for(:site_device, :url =&gt; {:controller=&gt;"site_devices", :action=&gt;"create"}) do |f| %&gt; &lt;tr&gt; &lt;%= f.hidden_field :site_id, :value =&gt; site.id %&gt; &lt;!-- etc --&gt; &lt;/tr&gt; &lt;% end %&gt; </code></pre> <p>so the form is initially instantiated from the SitesController page, but as it creates a SiteDevice, the form calls the SiteDevicesController#create method to create the page.</p> <p>SiteDevice has some validation code - so what if it fails. I'm trying to get the page to reload, so the form code simply redisplays (we will get the errors shown once the redisplay works)</p> <pre><code> if @site_device.save flash[:notice] = 'SiteDevice was successfully created.' format.html { redirect_to(@site_device) } else #re-render form format.html { render(:update) do |page| page[:site-device-form].replace_html partial: 'shared/site_device_form' end } end </code></pre> <p>Based on my understanding, render(:update) should render the block, passing in the page template. But what I get is an ActionView::MissingTemplate error:</p> <pre><code>ActionView::MissingTemplate (Missing template site_devices/update, application/update with {:locale=&gt;[:en], :formats=&gt;[:html], :handlers=&gt;[:erb, :builder, :coffee]}. Searched in: * "/home/ruby/frontier_development/Frontier/app/views" </code></pre> <p>Any ideas what is going wrong here? How do I get the render to :update the div-id based on the partial I have given it</p> <p>Thanks,</p> <p>Steve</p>
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    1. COWhat you're showing here is that you do not want to rerender the page, but just execute some js if the save fails? If so, I'm not sure you'll be able to do that inside a format.html{} -- likely need a format.js{} block but then your request would likely have to change to XHR. Might be easier to just re-render the entire page (template) with an instance variable to show the form.
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    2. COHi miked. Thanks for your response. Is it JS I need to render - I thought I just needed to re-render the partial for the form when it failed to validate? The partial template for the form renders the model errors (initially empty) as part of the form display. So if the validation fails, the model errors is now non-empty. So my thought was that I simply re-render the form, which should now appear with the errors showing, so they can be corrected. Is this the wrong way to approach things? XHR: is this not what render (:update) should do (as per p325 of the PragProg Rails book). Thxs, Steve
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      1. USSteve Gooberman-Hill
    3. COHi steve... I added a solution with what I think may work for you using render :action instead of render :update.
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