Draper Decorators

To separate presentation logic from models in Rails views, use the Draper gem to create decorators. This moves formatting and display logic into dedicated decorator classes, keeping models and controllers clean and maintainable.

You can access Rails view helpers inside a decorator through built-in integration provided by the Draper gem. Decorators automatically expose helper methods, allowing you to generate HTML snippets or format data without cluttering your view templates.

The best way to decorate associated model objects in Rails is using Draper's association decoration feature. It automatically wraps related model objects in their respective decorators, ensuring consistent presentation logic across nested data structures.

Pass context like the current user to Rails decorators using Draper's context passing mechanism. This injects contextual information into the decorator instance, allowing presentation logic to adapt based on user-specific data or session state.

Common anti-patterns when using decorators for presentation logic include creating fat decorators with excessive responsibilities, triggering N+1 queries through improper association decoration, and decorating objects too early in the Rails request cycle.

Yes, you can decorate collections of model objects with the Draper gem. It provides specific collection decoration strategies to efficiently apply presentation logic across arrays of records while maintaining clean view code.