How do I get data from the user?

[Jim-Lambert-Bose]

I want to store the user's email in the policy file like:
g, <user-id>, <role>, <email>

Is there any way to access the email address from the casbin API?

[hsluoyz]

No. As it's not a part of authorization. So why not query your field with one line of SQL code? Or is there a good reason for Casbin to support it? I'm open to suggestions.