Reprocessing images in Carrierwave

Question

Let's say my model has an image with :thumb and the client wants :tiny and :nano thumbnails.

How do I reprocess all the existing images using a rake task?

I've found a rake task that I thought would do it https://gist.github.com/777788 but it's giving me errors.

Ringler

Answer 1

According to the Carrerwave documentation you can use following commands:

Model.all.each do |model|
  model.image.recreate_versions!
end

Credenza

I've put that in a rake task now, it's a bit hard coded to my app but it'll do the trick – Ringler

will this recreate EVERYTHING, or just the newer versions? – Cristiecristin

It will recreate everything, if you need to recreate let's say images for last 100 records -> Model.last(100).each { |m| m.image.recreate_versions! } – Credenza

Depending on the storage, you may need to do this: github.com/carrierwaveuploader/carrierwave/wiki/… – Allegro

To get this to work, I had to add model.save inside the loop (which is also done by the code @Allegro pointed to). – Quartus

@Quartus So true. At least on some versions of carrierwave or it might be Mongoid related, calling recreate_versions! does reprocess the images, but when you reload the model it references the old updated to reference these new files if you do not explicitly call save on the model. – Sole

I added the check: model.image.recreate_versions! if model.image? since not all objects have uploaded images in my case. – Ymir

Answer 2

I wanted to expand on this great answer by Mikhail Nikalyukin

To Reprocess a single version you can do something like this

Model.all.each do |model|
  model.image.recreate_versions!(:version1, :version2)
end

this way if you added a new version you dont have to do all of them again

Demineralize