SFRA controllers, middleware chains and models

What the exam expects

• Write an SFRA controller that registers routes with server.get, server.post or server.use, chains middleware correctly and exports its routes.
• Choose res.render, res.json or res.setViewData for a response requirement, and predict what the template's pdict contains.
• Extend an inherited route with server.append, server.prepend or server.replace, and decide which is safe when the original calls a third-party system.
• Restrict a route with middleware filters (get, post, https, include) and use route events such as route:BeforeComplete.
• Place logic in models, helpers and factories in a custom cartridge, require modules in the narrowest scope, and handle error-page constraints.

Key terms: route (a Controller-RouteName endpoint registered by the server module); middleware chain (the functions between the route name and the main function, run in order); viewData (the output object that setViewData merges into and the template reads as pdict); model or ViewModel (code that turns Script API objects into plain JSON for the storefront); middleware filter (a provided step that rejects requests that don't match, such as https).

Key facts

Check yourself