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POPaperclip wrong attachment url on validation errors
 

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    <p>I have a preview of attached image in my update form. The problem appears when user gets validation errors on attachment field. In this case image thumbnail url becomes as if an image was uploaded without any errors (it shows name of file that was not saved at server).</p> <p>Here is how I get image url in my view: <code>&lt;%= image_tag(@product.photo.url(:medium)) %&gt;</code>.</p> <p>Controller:</p> <pre><code>def update @product = Product.find(params[:id]) @product.update_attributes(params[:product]) ? redirect_to('/admin') : render(:new) end def edit @product = Product.find(params[:id]) render :new end </code></pre> <p>Model:</p> <pre><code>class Product &lt; ActiveRecord::Base &lt;...&gt; @@image_sizes = {:big =&gt; '500x500&gt;', :medium =&gt; '200x200&gt;', :thumb=&gt; '100x100&gt;'} has_attached_file :photo, :styles =&gt; @@image_sizes, :whiny =&gt; false validates_attachment_presence :photo validates_attachment_content_type :photo, :content_type =&gt; ['image/jpeg', 'image/jpg', 'image/png', 'image/gif'], :message =&gt; I18n.t(:invalid_image_type) validates_attachment_size :photo, :less_than =&gt; 1.megabytes, :message =&gt; I18n.t(:invalid_image_size, :max =&gt; '1 Mb') after_post_process :save_image_dimensions &lt;...&gt; end </code></pre> <p><strong>UPD:</strong> The simpliest solution is to add <code>@photo_file_url = @product.photo.url(:medium)</code> in controller's update action before <code>@product.update_attributes</code> and <code>&lt;% @photo_file_url ||= @product.photo.url(:medium) %&gt;</code> in the view.</p>
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    1. COPlease include your code for your `edit` and `update` actions.
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    2. COThey are quite simple. Nothing but few CRUD tips (`Product.find(params[:id])` and `@product.update_attributes(params[:product])` for edit and update respectively).
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    3. COIt is a more common practice to edit your existing post with these updates.
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