Esmail

`DateField` was added in [MongoEngine 0.16.0](https://docs.mongoengine.org/changelog.html#changes-in-0-16-0), so you might need to upgrade versions.

This issue was recently causing me problems with `S3BotoStorage` from [`django-storages`](https://github.com/jschneier/django-storages). The proposed fix didn't help, as I was getting `resp.getheader(provider.version_id, None) == None`, but upgrading to `boto3`/`S3Boto3Storage` worked.

BTW, you can do this in the `pre_save*` signals by comparing the state of the not-yet-saved `document`'s fields to its previous state stored in Mongo. As an example: ```python def...

@Akila94, have you tried the solution @jocull linked to [above](https://github.com/yousseb/meld/issues/154#issuecomment-1889927349)? If it's working, you can close this issue as a duplicate of #151.