rails-presenter

Rails presenters using the SimpleDelegator pattern move display logic out of models and controllers into dedicated objects. This extraction isolates formatting concerns like dates and currency, ensuring your models and controllers remain maintainable and cleanly structured.

To build a Rails presenter with TDD, you first write a failing spec in the spec/presenters/ directory for your desired formatting output. You then implement the presenter class in app/presenters/ until the spec passes, ensuring testable and maintainable view logic.

The SimpleDelegator pattern for Rails presenters involves wrapping a model object within a delegator class. This allows you to add view-specific formatting methods, such as status badges or currency display, without polluting the underlying model with presentation logic.

Yes, Rails presenters can handle internationalization and generate HTML-safe output for display elements like status badges. The presenter encapsulates this formatting logic, ensuring that translated strings and HTML tags are safely rendered within your application views.

The best way to organize view-specific formatting logic in Rails is using presenters built with a Test-Driven Development workflow. By placing these classes in app/presenters/ and their specs in spec/presenters/, you maintain clear separation of concerns and high test coverage for display code.

You do not need any special dependencies to generate Rails presenters with TDD. The workflow relies on standard Ruby SimpleDelegator patterns and native Rails directory structures like app/presenters/ and spec/presenters/ to implement and test the formatting logic.