Overriding defaults to handle Team or Account based multi tenancy via url parameter

[raholland79]

I am developing a company/team based multi tenant application with nextjs. I've been reading the docs , specifically the various ways to override defaults but I can't quite work out a solution to my problem.

A user will sign their company up with an initial admin user and add any other company users. I have an Account model that stores a url slug for the company with a unique id and a User model that has the hashed password/email and stores the account_id. To login we pull the account from the url parameter and with prisma:

account = await prisma.account.findUnique({where: slug})
user = account.users.find(...etc)

so Account -> users

next-auth expects my Account to be a part of the individual user and I can't work out how to support my use case. Almost seems like I should have a Company that has many account/users ?

Also I see that I can use callbacks and pages - and I can override the signin procedure to check the account but I can't work out how to get the url param - can the pages option do something like signin: '/pages/[account]/signin ?