viewcomponent-patterns

To build reusable Rails UI components with ViewComponent, you extract scattered markup into Ruby objects using slots like renders_one and renders_many for flexible layouts. This pattern reduces duplication and transforms complex partials into consistent, testable view logic.

You can unit test Rails view components using TDD by writing tests for each UI block before implementation. This ensures cards, badges, tables, and modals render consistently across views, treating your view logic as testable Ruby objects.

Yes, this ViewComponent pattern works with Rails 8 applications. It requires the view_component gem to extract complex partials and compose slots-driven components like cards and modals into a reusable pattern library.

The best way to structure cards and modals in Rails is using slots-driven components with renders_one and renders_many. This approach allows flexible layouts with optional headers and footers, turning scattered markup into a documented pattern library.

You should not use ViewComponent for simple, one-off markup that does not require reuse or testing. The pattern is designed for extracting complex partials into unit-tested UI blocks, so applying it to trivial views adds unnecessary abstraction overhead.