bug and/or documentation issue on extending model - doesn't explain how to utilize extended model

[honestbleeps]

In your advanced topics, you explain how to extend the existing model, which is great! Docs here:

https://django-oauth-toolkit.readthedocs.org/en/latest/advanced_topics.html

However, doing this breaks the registration form because it's missing these two new fields, and the fields are hard-coded in the RegistrationForm class. Submitting the form therefore fails due to empty fields (since they're not even rendered)

It would be great if the documentation went a step further and explained how to ensure the new fields show up in the RegistrationForm.

Alternatively, it could potentially be a bug. Since we can set the application model as a setting, perhaps the RegistrationForm could/should derive the fields automatically from the class in that setting?

[n2ygk]

Closing due to age and no recent activity. Feel free to reopen/submit a PR if you are still interested.