Displaying original image while processing as an option to :processing_image_url

[kamelury]

The idea of displaying the original image while processing thumbs etc. seems to be floating around. However it is not available as an option in delayed_paperclip.
Is there any reason why you haven't done it already?
I am thinking about contributing to delayed_paperclip and submitting a patch request with it, but I would like to know if it was considered before or maybe rejected for some reason?

My idea was to make :processing_image_url accept a symbol of a method name in the model, that would be called to calculate the path to the original image. Or another option would be to allow :original symbol as on option for :processing_image_url.
I do struggle however to find the path of the original image in the paperclip attachment.

It can obviously be done in the view by checking .processing? and then displaying url(:thumb) or url(:original), but I treat it as a last resort

I would appreciate any suggestions or hints.

[peachananr]

Here's what I did:

process_in_background :photo, :processing_image_url => :process_image

def process_image
      options = photo.options
      options[:interpolator].interpolate(options[:url], photo, :original)
end

and everything seems to work ok at this point. Give it a go. :)

[kamelury]

Fantastic! Thank you soo much! That is exactly what I was looking for.

[riffraff]

plase correct me if I'm wrong, but while this method works it could be slightly improved.

Namely: suppose I process online the styles "large" and "small", but in background I process "thumbnail", "hd", "landscape", "vignette" etc..

It would be great to be able to return a different fallback depending on which style is being currently requested, e.g.

def process_image fmt
      options = photo.options
      large_formats = %i[hd landscape desktop retina]
      fallback_format = large_formats.include?(fmt) ? :large : :small 
      options[:interpolator].interpolate(options[:url], photo, fallback_format)
end

Maybe this is already possible but I have not understood how :)