Textract runs when document file hasn't updated

[kaedroho]

Currently, it appears there's no check for whether the file has actually changed before rerunning textract so it probably reruns even if the user has only updated the title.

@gasman and I were discussing adding file hashing to Wagtail Images/Documents for cache-busting but might help solve this issue too.

[khink]

You are right, it always runs, even if only title/tags were changed. No way to tell in save() what was updated, so yes, a hash would come in handy.

[allcaps]

Maybe you can query the current object in save method and inspect if the file field has changed.
https://stackoverflow.com/questions/12461100/django-detecting-changed-imagefield-with-same-filename

[khink]

@kaedroho Is there an issue in Wagtail for file hashing, is it likely that it'll be in wagtail some time soon?

[kaedroho]

Yep, there's a PR here: wagtail/wagtail#4526

[zerolab]

The document file hash will make it in Wagtail 2.4. So this could probably be looked at with the latest Wagtail master