Incompatible version data¶
Django-reversion stores the versions of a model as JSON. If a model changes, the migrations are not applied to the stored JSON data. Therefore it can happen that an old version can no longer be restored. In this case the following error occurs:
reversion.errors.RevertError: Could not load <Foo: bar> - incompatible version data.
RegistrationError: class ‘myapp.MyModel’ has already been registered with Reversion¶
This is caused by your
models.py file being imported twice, resulting in
reversion.register() being called twice for the same model.
This problem is almost certainly due to relative import statements in your codebase. Try converting all your relative imports into absolute imports.