Ash extension for Lavash resource configuration.

This extension allows you to configure fine-grained PubSub invalidation directly on your Ash resources.

Usage

defmodule MyApp.Product do
  use Ash.Resource,
    extensions: [Lavash.Resource]

  lavash do
    notify_on [:category_id, :in_stock]
  end
end

Options

• notify_on - List of attributes to broadcast changes for. When a mutation changes any of these attributes, Lavash will broadcast to combination topics so that LiveViews filtering on these attributes can be notified.

How it works

When a form submits and mutates a resource with notify_on configured:

1. Lavash extracts the old and new values for each notify_on attribute
2. Broadcasts to all subset combinations of those attribute values
3. LiveViews subscribed to matching combination topics receive invalidation

This enables fine-grained cache invalidation - only LiveViews whose current filters match the changed record will be refreshed.