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.

score 57 · Accepted Answer · answered Jan 30 '12 at 14:56

57

According to the Carrerwave documentation you can use following commands:

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

answered Jan 30 '12 at 14:56

1

I've put that in a rake task now, it's a bit hard coded to my app but it'll do the trick – Joseph Le Brech Jan 30 '12 at 15:10
will this recreate EVERYTHING, or just the newer versions? – meow Jan 14 '13 at 06:07
1

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! }` – Mikhail Nikalyukin Jan 14 '13 at 07:30
2

Depending on the storage, you may need to do this: https://github.com/carrierwaveuploader/carrierwave/wiki/How-to%3A-Recreate-and-reprocess-your-files-stored-on-fog – etagwerker Jan 23 '14 at 12:49
3

To get this to work, I had to add `model.save` inside the loop (which is also done by the code @etagwerker pointed to). – bjnord Mar 30 '14 at 12:05
@bjnord 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. – Timo Apr 04 '14 at 05:29
1

I added the check: `model.image.recreate_versions! if model.image?` since not all objects have uploaded images in my case. – Besi Mar 05 '15 at 18:58

score 2 · Answer 2 · answered May 29 '17 at 13:30

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

2 Answers2