Views

Keep your HTML clean; any intensive Ruby code in views is likely misplaced. Inline Ruby in views often scales into maintenance nightmares.

The views layer should not manage domain logic, which belongs in models, or orchestrate application flow, which is a controller's responsibility.

Keep the view layer clean with helpers, partials, and built-in functionality effectively.

Views are for presenting data. Not preparing it. Logic and data manipulation in views leads to complexity and code duplication.