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validate image dimensions with paperclip

January 31st, 2009

I’m liking paperclip, in a recent project I chose it specifically because it buffers writes on uploads, which should help keep memory usage down.

I needed to validate that an uploaded image was at least a certian size, and it was a little tricky, but here’s what I came up with:

 has_attached_file :image,
                   :styles => { :original => ["1000x600>", :jpg]},
                   :whiny_thumbnails => true

 def validate
    dimensions = Paperclip::Geometry.from_file(self.image.queued_for_write[:original])
    self.errors.add(:image, "Please upload a file at least 700 pixels wide") if dimensions.width < 700
    self.errors.add(:image, "Please upload a file at least 200 pixels tall") if dimensions.height < 200
  end

like it? hate it? have something better?

Posted by Jared
Filed in Home, tips
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4 Responses to “validate image dimensions with paperclip”

  1. Adam Says:
    September 30th, 2009 at 9:00 am

    I wish i googled this before i went through the trouble of building it manually. thanks!

  2. Dave Mauldin Says:
    October 15th, 2009 at 3:56 pm

    So I’m trying to do something similar but running into an issue while running tests. The method you’ve posted causes tests to hang in Paperclip::Geometry. I even tried just doing a basic piece of code that just gets dimensions after a save.

    Also causes tests to hang. Can’t find any information anywhere on why this is happening and was hoping if you’d experienced it, you’d worked around it.

  3. Dave Mauldin Says:
    October 15th, 2009 at 3:57 pm

    The code can be seen at http://gist.github.com/211365

  4. Jared Says:
    October 15th, 2009 at 4:34 pm

    @Dave can you post your test code too?

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