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2011-09-22T19:08:38.247
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2011-09-23T16:54:06.700
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I came across this, and it looks like an example of how to solve this problem: <a href="https://gist.github.com/995663">https://gist.github.com/995663</a>. The uploader first gets loaded when you call <code>mount_uploader</code>, at which point things like <code>if image?</code> or <code>elsif video?</code> won't work, because there is no file to upload defined yet. You'll need the methods to be called when the class is instantiated instead. What the link I gave above does, is rewrite the <code>process</code> method, so that it takes a list of file extensions, and processes only if your file matches one of those extensions <pre><code># create a new "process_extensions" method. It is like "process", except # it takes an array of extensions as the first parameter, and registers # a trampoline method which checks the extension before invocation def self.process_extensions(*args) extensions = args.shift args.each do |arg| if arg.is_a?(Hash) arg.each do |method, args| processors.push([:process_trampoline, [extensions, method, args]]) end else processors.push([:process_trampoline, [extensions, arg, []]]) end end end # our trampoline method which only performs processing if the extension matches def process_trampoline(extensions, method, args) extension = File.extname(original_filename).downcase extension = extension[1..-1] if extension[0,1] == '.' self.send(method, *args) if extensions.include?(extension) end </code></pre> You can then use this to call what used to be process <pre><code>IMAGE_EXTENSIONS = %w(jpg jpeg gif png) DOCUMENT_EXTENSIONS = %(exe pdf doc docm xls) def extension_white_list IMAGE_EXTENSIONS + DOCUMENT_EXTENSIONS end process_extensions IMAGE_EXTENSIONS, :resize_to_fit => [1024, 768] </code></pre> For versions, there's a page on the carrierwave wiki that allows you to conditionally process versions, if you're on >0.5.4. <a href="https://github.com/jnicklas/carrierwave/wiki/How-to%3A-Do-conditional-processing">https://github.com/jnicklas/carrierwave/wiki/How-to%3A-Do-conditional-processing</a>. You'll have to change the version code to look like this: <pre><code>version :big, :if => :image? do process :resize_to_limit => [160, 100] end protected def image?(new_file) new_file.content_type.include? 'image' end </code></pre>
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