#15 √ resolved
linoj

allow :style => Proc

Reported by linoj | May 15th, 2008 @ 11:40 PM

Requesting the following one-line patch be added:

in paperclip/attachment.rb#post_process, after the line

dimensions, format = args

add

dimensions = dimensions.call(instance) if dimensions.respond_to? :call

example usage:

suppose your model has columns for custom_width, custom_height

:styles => { :small => "50x50>",

:custom => Proc.new {|instance| "#{instance.custom_width}x#{instance.custom_height}>" }

also, to allow updating the thumbs when width,height change, I used acts_as_modified plugin in the model:

acts_as_modified

def before_save

image.reprocess! if custom_width_modified? || custom_height_modified?

end

Comments and changes to this ticket

  • Tim Haines

    Tim Haines June 13th, 2008 @ 10:57 AM

    I'd like the ability to do something similar to this. Not quite sure what I want - but it does involve having custom widths and heights.. this would probably solve it for me.

  • Tim Haines

    Tim Haines May 22nd, 2008 @ 10:31 PM

    Okay. Have thought it through a bit more. What I'd like to do is specify a thumb width and height in the image url called from a view. When that url is hit, ideally Paperclip would load the thumbnail from storage if that dimension pair had been requested previously, or create the thumbnail on the fly if the dimension pair hadn't been requested previously..

    I think the request by linoj will work for me though - it'll just require a bit more hoop jumping.

  • Jon Yurek

    Jon Yurek May 27th, 2008 @ 02:27 PM

    • → State changed from “new” to “resolved”

    I put this into master the other day. Thanks for the suggestion.

    Tim, I don't think that's necessarily something that would be useful to people-at-large, so I probably won't put it in. You can definitely hack something in, though, with a combination of using the Procs and overriding Paperclip::Attachment#url.

  • Jon Yurek

    Jon Yurek June 13th, 2008 @ 11:00 AM

    • no changes were found...
  • David Baldwin

    David Baldwin September 16th, 2008 @ 12:24 AM

    • → Tag cleared.

    Note that you can call this reprocess! in a before_save operation without acts_as_modified in Rails 2.1. You can use the dirty object functionality like this:

    def before_save logo.reprocess! if logo_width_changed? || logo_height_changed? end

    Here is additional information on dirty objects from Ryan Daigle's blog... http://ryandaigle.com/articles/2...

  • David Baldwin

    David Baldwin September 16th, 2008 @ 12:29 AM

    Sorry, didn't realize you could use Markdown...

    Note that you can call this reprocess! in a before_save operation without acts_as_modified in Rails 2.1. You can use the dirty object functionality like this:

    def before_save
  logo.reprocess! if logo_width_changed? || logo_height_changed?
end

    Here is additional information on dirty objects from Ryan Daigle's blog...

    http://ryandaigle.com/articles/2...

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