bug: Setup process allows you to create more than one superuser with the same email.

[James-Makela]

What version of MyFinances are you currently using?

latest

What device type are you currently facing the issue on?

Desktop

Describe the bug

Steps:

1. Clone repo
2. Follow set up instructions at https://docs.myfinances.cloud/getting-started/installation/#setup-the-backend-django
3. At step 5, create a superuser, do this twice, with the same email, but different username
4. Complete the setup
5. Run the server and try to log in

At this point the log in fails with the following error:

File "/Users/james/repos/MyFinances/venv/lib/python3.11/site-packages/django/db/models/query.py", line 652, in get
    raise self.model.MultipleObjectsReturned(
backend.models.User.MultipleObjectsReturned: get() returned more than one User -- it returned 2!

I have tested this process a few times, the program seems to only check for a duplicate user name when creating a superuser, however allows you to create a new user with a different username, and the same email. This causes log in to fail, as log in appears to check for email, then throws an error when it finds two accounts with the same email.

I assume the same protection that is in place to check for a duplicate username could be utilized to also check for a duplicate email address.

[TreyWW]

Amazing, thank you for the bug report! I'll get in this later, thanks :)

[James-Makela]

No worries. I would be keen to tackle this one over the weekend if I could please be assigned?