Question 1

How do I implement multi-tenancy with Rabarber in Rails?

Accepted Answer

Assign roles using the context parameter, like user.assign_roles(:admin, context: project), and define grant_access rules with context. Rabarber handles scoped permissions automatically, but you must prune orphaned roles when contexts are deleted.

Question 2

Rabarber vs Pundit: which is better for authorization?

Accepted Answer

Rabarber is role-focused and Rails-native, ideal for simple to moderate role-based systems. Pundit uses policy objects for more flexible, attribute-driven logic but requires more setup. Choose Rabarber for quick role integration; Pundit for complex policy needs.

Question 3

Can I use Rabarber with Devise for authentication?

Accepted Answer

Yes, Rabarber works with any authentication system that provides a current_user method. Configure the current_user_method in the initializer to match Devise's setup, as shown in the Configuration section.

Question 4

How to customize unauthorized access behavior?

Accepted Answer

Override the when_unauthorized method in your controller to define custom responses, such as returning a 404 error to hide protected resources, as detailed in the When Unauthorized section.

Question 5

What happens to roles when a context is deleted?

Accepted Answer

Roles become orphaned and ignored by default. You must manually clean them up using Rabarber.prune to avoid database clutter, as mentioned in the Orphaned Contextual Roles section.

Question 6

How to add dynamic conditions to authorization rules?

Accepted Answer

Use if/unless parameters in grant_access with symbols or procs that reference controller methods or custom logic, allowing integration with policy objects or complex checks, as shown in Dynamic Authorization Rules.

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