CanCanCommunity/cancancan

Health v2 · maintenance only

Adoption not part of the score

5686 stars · 631 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

CanCanCan is an authorization library for Ruby and Ruby on Rails that restricts which resources a user can access. Permissions are defined in centralized Ability classes and checked via helpers in controllers and views, with automatic record loading and permission scoping for Rails controllers.

Use cases

• restrict which records a user can read or edit in a Rails app
• define role-based permissions in one Ability file
• authorize controller actions automatically in Rails
• scope database queries to only permitted records
• check permissions in views with can? and cannot?
• handle guest vs logged-in vs admin access rules

When to choose

• you are building a Ruby on Rails application and need centralized authorization logic
• you want permissions defined once and reused across controllers, views, and queries
• you need role-based or attribute-based access control without duplicating checks

When to avoid

• you need authentication (login/password handling) rather than authorization
• you are not using Ruby or Rails
• you need fine-grained, dynamically administered permissions managed at runtime in a database-driven policy engine

Facets

library · maturity stable

authorization middleware web-development backend security ruby ruby-on-rails gem permissions access-control ability-rules web-server

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