rails-presenter

Rails presenters isolate view formatting from business logic by wrapping models with SimpleDelegator. This pattern extracts display-specific methods, such as formatting and badges, into dedicated classes, keeping your models clean and ensuring consistent presentation across multiple views.

The best way to test Rails presenters using TDD is a specs-first workflow. Create a failing presenter spec for the resource, implement the presenter extending BasePresenter, and run the specs to verify the output is HTML-safe and GREEN.

To ensure HTML-safe output with presenters, integrate ActionView helpers and I18n directly within your presenter methods. The BasePresenter pattern wraps the model and manages formatting safely, preventing cross-site scripting issues in the view layer.

You need a presenter pattern in Rails when multiple views and components require consistent display formatting for the same model. It is specifically useful for generating reusable display badges and isolating complex view logic from the core business model.

Yes, the Rails presenter pattern works with I18n translations. Presenters integrate ActionView helpers and I18n within the wrapper class, allowing you to resolve localized display formatting and output HTML-safe translated strings directly from the wrapped model.