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copied!<blockquote> <p>The big problem is that my server does not permit my application to write files locally, and these plugins all seem to want to create a Tempfile.</p> </blockquote> <p>Yes it does, or you wouldn't be able to upload the files at all.</p> <p>Rails itself creates tempfiles if the uploaded file is larger than 15k or so.</p> <pre><code><%= f.file_field :file %> .... file_param = params[:upload][:file] </code></pre> <p>As soon as you upload something bigger than 15k, <code>params[:upload][:file]</code> is going to be an <code>ActionController::UploadedTempFile</code>.</p> <p>What's the difference? Rails is likely writing it's tempfiles to the global temp directory (which everyone can write to) but the plugins are probably trying to write to RAILS_ROOT/tmp, which your server disallows. The good news is you can just configure those things to use a different temp dir so they can write their tempfiles, and it should all work.</p> <p>For example, <a href="http://github.com/technoweenie/attachment_fu/tree/master/lib/technoweenie/attachment_fu.rb#L4" rel="nofollow noreferrer">attachment_fu's default temp path is under rails root.</a>. You should be able to change it like this:</p> <pre><code>Technoweenie::AttachmentFu.tempfile_path = Dir::tmpdir </code></pre> <p>**PS: pulling the file data straight out of the params and putting it into the database may still be the best way to go. I personally dislike attachment_fu and it's ilk, as they try to do too many things, but either way, it's very useful to know about how the whole uploaded file/temp file thing works in rails :-)</p>

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