Processing file before upload using ActiveStorage

Question

How would I process a file before it's uploaded using activestorage. I need to be able to modify an svg file's content before it actually gets uploaded to S3. Can't seem to find any callbacks.

Answer 1

There is no way to do this natively with ActiveStorage. It's the major drawback with using ActiveStorage.

As far as I know, the only way to modify an upload is to create a variant of the original upload after it is created...which creates a (completely different) variant image based on the image that was originally uploaded.

ActiveStorage is easy to setup but, after using it with a few applications, Carrierwave..etc seem like better options.

In addition, if you want to upload in a background job, ActiveStorage is a pain.