how to migrate from latest stable 2.0.1 to 2.1-dev

[telsch]

Upgrading only describes how to upgrade from 1.5.x to 2.x

In example docker-compose.yml database also changed from sqlite3 to postgres. If i manually backup from 2.0.1 sqlite3
python manage.py dumpdata --exclude=contenttypes > backup.json

and then try to restore in 2.1-dev with postgres
python manage.py loaddata backup.json

i got this error
Traceback (most recent call last): File "/venv/lib/python3.9/site-packages/django/db/models/options.py", line 608, in get_field return self.fields_map[field_name] KeyError: 'file_name'

Which database migrations needs to be applied before to be able to update?

[ciur]

Migration from 2.0 to 2.1 is more complex than running database migrations.
There are changes in how files are stored/read on local file system as well.

For example:

• 2.0 stores OCRed data as two files per page: one jpeg + one hocr
• 2.1 stores OCRed data as one single file per page: svg file with embbeded jpeg

For this ticket I will do following actions:

1. Document relevant changes (relevant for migration document existing documents stored in 2.0) changes between version
2. Implement a small, command line utility, as installable python package, which interactively help with migration