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Editorial Team
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Asked: 2026-05-24T19:57:48+00:00

I’m using Dragonfly and would like to have a default image that resizes in

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I’m using Dragonfly and would like to have a default image that resizes in the same way present thumbnails do.

I currently have the following code, but when Dragonfly uses the fetch_file method, it tries to process a thumbnail but the resulting URL is a dead link. 

if listing.image
  image = listing.image.jpg
else
  image = Dragonfly[:images].fetch_file('/toekomst/images/speech-bubble.png')
end  
image_tag image.jpg.thumb(size).url, :class => "framed"

I can’t find much help on line for this, so any hints are most appreciated! Thanks!

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1 Answer

  1. Editorial Team

    I managed to get this fixed by first adding the config code provided by Mark.

    I was then getting this error in my logs:

    identify: unable to open image `/toekomst/images/speech-bubble.png': No such file or directory @ error/blob.c/OpenBlob/2584.
identify: unable to open file `/toekomst/images/speech-bubble.png' @ error/png.c/ReadPNGImage/3079.
[2011-08-19 10:33:51] ERROR Dragonfly::FunctionManager::UnableToHandle: None of the functions registered with #<Dragonfly::Encoder:0x00000100d66d88> were able to deal with the method call encode(#<Dragonfly::TempObject:0x00000104aa2800 pathname=#<Pathname:/toekomst/images/speech-bubble.png> >,:jpg). You may need to register one that can.

    Since ImageMagick can’t seem to use a path name relative to the project, I had to assign an absolute path. Like this:

    img = Dragonfly[:images].fetch_file(File.join(Rails.root, 'public', 'toekomst', 'images', 'speech-bubble.png'))
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