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In my SaaS ERP, there are takeaways below:

1. Both User and Role modules are compliant with the core infrastructure, including editing, listing and viewing.
2. A user can have more than one roles. At the same time, a role can be assigned to more than one user.
3. The permissions of a user depends on all roles assigned to him. The common permissions of all roles are the actual authentication of the user.
4. When determining whether a user has one permission, a simple funtion can be invoked.