Question 1

How to implement multi-tenancy with Rabarber in Rails?

Accepted Answer

Use the `context` parameter in role assignments and authorization rules. For example, assign roles with `user.assign_roles(:owner, context: project)` and define access with `grant_access roles: :member, context: :current_project`. Remember to clean up orphaned roles using `Rabarber.prune` when contexts are deleted.

Question 2

Rabarber vs CanCanCan: which is better for role-based auth?

Accepted Answer

Rabarber is simpler and Rails-native, ideal for straightforward role-based access with multi-tenancy. CanCanCan offers more flexibility with ability definitions but can be heavier. Choose Rabarber for clarity and built-in context support; CanCanCan for complex permission logic.

Question 3

Can Rabarber handle permission checks based on object attributes?

Accepted Answer

Partially, through dynamic rules with `if`/`unless` conditions. You can use procs or methods to incorporate custom logic, but it's not a full attribute-based system like Pundit, so for fine-grained attribute checks, additional work is needed.

Question 4

How to customize unauthorized access behavior in Rabarber?

Accepted Answer

Override the `when_unauthorized` method in your controller. By default, it redirects or returns 403, but you can change it to, for example, `head :not_found` to hide protected resources, as shown in the 'When Unauthorized' section.

Question 5

Is Rabarber suitable for large Rails applications?

Accepted Answer

It can work for medium-sized apps, but its simplicity might be limiting in very complex systems. If you have many overlapping roles or need advanced policy logic, a more robust solution like Pundit might be better, though Rabarber's caching helps with performance.

Rabarber

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