🧑‍💻(models) improve user str representation

[mjeammet]

Purpose

As suggested in #106 : Improve user model str representation.

Implementation

EDIT after Identity model removal :

• displays name if user has a name
• displays email if user has no name but an email
• displays sub otherwise

[sampaccoud]

@mjeammet I think technically, on the "sub" field is really needed to identify the user. That was the idea behind the decision to make the other fields like name and email optional.

[mjeammet]

@mjeammet I think technically, on the "sub" field is really needed to identify the user. That was the idea behind the decision to make the other fields like name and email optional.

I wonder if the sub isn't necessarily linked to an email adress. Like, is there any identity provider not using email/password as main mean of identifcation ?

More importantly here ; do we want to allow linking a sub to an adress email different than the one used right before, to log in ? Actually, I guess we do. What do you think ?

[mjeammet]

In the end, I moved identity-related complexity to Identity's representation.
In the user model, I return str(main_identity) if there is one, and admin_email / uuid otherwise.