Comments on: Passing remote web data to attachment_fu

By: Duende13

Duende13 — Wed, 26 May 2010 09:41:35 +0000

Thank you!!!!

By: matteo

matteo — Tue, 10 Mar 2009 22:13:13 +0000

Thanks a lot. Easy and effective.

By: matt

matt — Thu, 08 Jan 2009 21:23:38 +0000

Mark: It should just respect the :resize_to => ’400×300>’ directive exactly as it stands. As far as attachment_fu is concerned, the IO object it receives is no different from the one it would get from an upload (or that’s the plan, anyway), so all the resizing / storage functionality will work as normal.

By: Mark

Mark — Thu, 08 Jan 2009 21:07:54 +0000

This is great but how would you go about having attachment_fu resize the image like if it was uploaded?

By: tachekent

tachekent — Wed, 05 Nov 2008 08:54:43 +0000

I adapted this to use a local image file grabbed from a video:
def source_file=(filename) io = open(filename) (class << io; self; end;).class_eval do define_method(:original_filename) { filename.split('/').last } define_method(:content_type) { 'image/jpeg' } define_method(:size) { File.size(filename)} end self.uploaded_data = io end

By: Easy Upload via URL with attachment_fu - almost effortless

Easy Upload via URL with attachment_fu - almost effortless — Fri, 24 Oct 2008 23:48:55 +0000

[...] did a bit of digging around before I came across this handy trick that makes it pretty painless to add uploading via a URL to your app. I’ve wrapped up the code a [...]

By: Paul

Paul — Mon, 13 Oct 2008 17:02:31 +0000

Thanks a million. You saved us lots of time :)

By: Alex

Alex — Fri, 03 Oct 2008 09:01:00 +0000

Very useful, just what I was looking for. Thanks!

By: Geir Freysson

Geir Freysson — Mon, 15 Sep 2008 16:27:53 +0000

Hi there. Your tip saved me tons of time and lots of code! Thanks ;)

By: matt

matt — Thu, 29 Nov 2007 11:59:36 +0000

Since people are finding this useful (which is great), perhaps I should fill in the missing detail on the (class << io; self; end;) bit which I now understand a bit better. It turns out that's a standard Ruby idiom for returning the singleton class of the io object, which is a special subclass of the IO class that's spontaneously created to just refer to this particular object (io). So, the class_eval block defines original_filename as an instance method within the class of this particular io object.

Not really sure why you need the class_eval rather than simply doing class << io; (define method here); end - I suspect that would work too, and the original programmer I borrowed it off just used that idiom out of familiarity. If so, it just goes to show that there's a fine line between idioms and cargo cult programming...