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POWhy won't Carrierwave and MiniMagick images composite correctly?
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copied!<p>I am using carrierwave (0.9.0) with fog (1.18.0), mini_magick (3.6.0), and Rackspace CloudFiles. I want to composite images.</p> <p>I have two models: Products and Emails. In the products uploader I am trying to create a process that loops through all the emails and composites the product image on top of each <code>email.background_image</code>. I also want to control the name of this image so that is:</p> <pre class="lang-rb prettyprint-override"><code>"#{email.name}_#{product.product_number}.jpg" </code></pre> <p>I have included my process and method below. Test result in a file being uploaded to cloudfiles named "email_123.png" and the original image. The name doesn't currently include the email's name and images are not compositing, I just receive the original back. Anything obvious I am missing here? Thanks!</p> <pre class="lang-rb prettyprint-override"><code>version :email do process :email_composite def email_composite Email.all.each do |email| email_image = email.secondary.url email_name = email.name merge(email_name, email_image) end end def merge(email_name, email_image) manipulate! do |img| @product = Product.find(model.id) email_image = ::MiniMagick::Image.open(email_image) img = email_image.composite(img, "jpg") do |c| c.gravity "Center" end # img = yield(img) if block_given? img = img.name "#{email_name}_#{@product.product_number}.png" img end end end </code></pre> <h1>UPDATED</h1> <p>First I wanted to thank you for your thorough answer, the amount of effort involved is obvious and appreciated.</p> <p>I had a few more questions when trying to implement this solution. Inside the #compose method you have:</p> <pre><code>email_image = ::MiniMagick::Image.open(email_image) </code></pre> <p>Should this be:</p> <pre><code>email_image = ::MiniMagick::Image.open(email_image_url) </code></pre> <p>I assume this from seeing the define_method call included below ( which was awesome by the way - I didn't know you could do that):</p> <pre><code>define_method(:email_image_url) { email.secondary.url } </code></pre> <p>After getting Undefined method "versions_for" I switched the #versions_for method as I will always want all email to have a secondary version.</p> <h2>versions_for before</h2> <pre><code>def self.versions_for emails reset_versions! email.find_each { |e| version_for_email(e) } end </code></pre> <h2>versions_for after changes</h2> <pre><code>def self.versions_for reset_versions! Email.all.find_each { |e| version_for_email(e) } end </code></pre> <p>This change allowed me get rid of the error. </p> <p>The end result of all of this is that everything appears as if it works, I can upload imagery without error, but now I have no resulting image for the emails versions. I still get my other versions like thumb etc. Any idea what could cause this? Again thanks for all the help you have provided thus far.</p>

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