Read Model Builder

When to use

Use this skill when asked to create a new read model or add event handlers to an existing read model in any Rails application under apps/.

Working Directory

Determine which app the read model belongs to. Default is apps/rails_application/ unless the user specifies another app (e.g. apps/crm/, apps/todo_mvc/). All paths below are relative to the target app directory.

Step-by-step process

1. Gather requirements

Before writing any code, clarify:

• The module name for the read model (e.g. Wishlist, Notifications)
• Which domain events it will subscribe to (e.g. Catalog::ProductAdded, Ordering::OrderPlaced)
• What data needs to be stored and queried
• What facade methods the rest of the app needs — only add facade methods that are actually used by controllers/views, not speculative ones