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Controllers

  • Controllers handle HTTP only: receive request, delegate to model, return response.
  • Actions should not exceed 10 lines (excluding strong params). Longer actions often signal business logic that belongs in a model or PORO.
  • Maximum one instance variable per action.
  • No business logic, calculations, email sending, or multi-object operations in controllers.
  • Always use strong parameters. Never params.permit!.
  • Return status: :unprocessable_entity on failed form renders (required by Turbo).
  • Prefer RESTful routes. Custom verb actions (e.g., post "activate") usually mean a missing noun/resource (e.g., resource :trial, only: [:create]).