[Rails] Roles that are User<>Project Based

Hello... Currently I'm using Devise & CanCan which allows me to create
Users with Roles using a (Roles_Users) table.

That's nice, but what I want is to Have Projects in my app and for
each project for a user to possibly have a role like (Admin, Viewer,
etc)

What kind of Model would work for this?

Models
Users
has_many: projects

Projects
?

Roles
?

Users_Roles_Projects (user_id, project_id, role_id)

What do you think? I'm a newbie and could use the understanding and
thinking from you fine experienced folks. Thanks!

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