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Asked: 2026-05-11T13:31:53+00:00

I need to create an AR migration for a table of image files. The

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I need to create an AR migration for a table of image files. The images are being checked into the source tree, and should act like attachment_fu files. That being the case, I’m creating a hierarchy for them under /public/system.

Because of the way attachment_fu generates links, I need to use the directory naming convention to insert primary key values. How do I override the auto-increment in MySQL as well as any Rails magic so that I can do something like this:

image = Image.create(:id => 42, :filename => 'foo.jpg') image.id #=> 42
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  1. Yikes, not a pleasant problem to have. The least-kludgy way I can think of to do it is to have some code in your migration that actually ‘uploads’ all the files through attachment-fu, and therefore lets the plugin create the IDs and place the files.

    Something like this:

    Dir.glob('/images/to/import/*.{jpg,png,gif}').each do |path|    # simulate uploading the image   tempfile = Tempfile.new(path)   tempfile.set_encoding(Encoding::BINARY) if tempfile.respond_to?(:set_encoding)   tempfile.binmode   FileUtils.copy_file(path, tempfile.path)    # create as you do in the controller - may need other metadata here   image = Image.create({:uploaded_data => tempfile})   unless image.save     logger.info 'Failed to save image #{path} in migration: #{image.errors.full_messages}'   end    tempfile.close! end

    A look at attachment-fu’s tests might be useful.

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