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    <p>Your solution of using <code>File.open</code> would work, but you should verify that the name is valid with <code>File.basename</code> so someone couldn't pass <code>../../secret_credentials.yml</code> and expose info you don't want them to. Also checking it against the list of preset images would be a good idea.</p> <p>However, you can do this more efficiently by skipping CarrierWave in this case.</p> <p>Add a new field called <code>library_image</code>, when someone wants to use a preset image, then you set <code>library_image</code>, if they want to use their own photo, unset <code>library_image</code> and upload the photo as normal. Then add a helper method like:</p> <pre><code>def avatar_url if self.library_image? "http://example.com/images/#{self.library_image}" else self.picture.url end end </code></pre> <p>This assumes that you can find the preset images at <code>http://example.com/images/[name]</code> and you are using <code>mount_uploader</code> in CarrierWave named <code>picture</code>.</p> <p>Now anytime you want to display their picture, you would call <code>avatar_url</code> which will check if it should return the preset URL, or the picture they uploaded.</p> <p>An example of how you would update <code>library_image</code> or <code>picture</code> based on your original question:</p> <pre><code>if params[:file].is_a?(Hash) model.library_image = params[:file][:url] model.remove_picture = true else model.library_image = nil model.picture = params[:file] end </code></pre>
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    1. POCarrierwave - "uploading" a file from a string
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    1. COHow can I detect that the user is uploading a new picture? I mean, what's the callback function name I should write to reset the library_image? Thank you!
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    2. CO@CamelCamelCamel I've updated my original answer with an example.
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    3. COHow do I return file as either the preset or the file depending on avatar_url?
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