[Rails] User roles, authorisation, on specific projects

Hello,

Currently I am working on a app, so far I have User (with devise) which are able to create projects. So, if  user1 create project A and project B I want him, to be able to assign user2 with role admin on project A, and user2 with moderator admin on project B. 

I was thinking in creating a UserRoleProject link table, is it a good idea? Also I intend to use CanCan for the authorisation.

Thank you

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