rails-controllers

To build a RESTful Rails controller, structure index, show, create, update, and destroy actions using strong parameter whitelisting for secure mass assignment. Apply before_action filters for authorization and keep controllers thin by delegating business logic to services or models.

Handling HTML and JSON responses in Rails controllers requires content negotiation using respond_to blocks. This allows your controller actions to serve standard HTML views for browser requests and JSON payloads for API clients with proper HTTP status codes.

Nested and namespaced routes in Rails are set up using routing conventions for resourceful endpoints, member and collection actions, and shallow nesting. This organizes hierarchical resources logically while preventing deeply nested URL structures.

You need before_action filters in Rails controllers for authorization and shared setup, while rescue_from handles standard error handling globally. Both mechanisms keep controllers thin by extracting cross-cutting concerns from individual action definitions.

You can manage sessions and cookies within Rails controller actions using built-in session and cookie management methods. This enables secure state handling across requests while maintaining RESTful conventions for resourceful controller routing.

Extracting controller logic into concerns or service objects in Rails keeps controllers thin and maintainable. This approach separates business logic from request handling, ensuring RESTful endpoints remain focused on routing, strong parameters, and response formatting.