AgentSkillsCN

scaffold-multi-stream-projection

创建 Marten 多流投影，将来自 *多个* 流的事件汇聚成单一视图（例如，摘要、仪表盘）。

SKILL.md
--- frontmatter
name: scaffold-multi-stream-projection
description: Create a Marten Multi-Stream Projection to aggregate events from *multiple* streams into a single view (e.g., summaries, dashboards).

Follow this guide to create a Multi-Stream Projection (View Projection) in Marten. This allows you to aggregate data across many different streams into a single document (or multiple documents based on grouping).

  1. •

    Define the Projection Class

    • •Create a class in src/BookStore.ApiService/Projections/
    • •Naming: {Summary}Projection (e.g., AuthorDashboardProjection or MonthlySalesProjection)
    • •Base Class: MultiStreamProjection<T, TId>
    • •Template: templates/Projection.cs
  2. •

    Configure in Marten

    • •Open src/BookStore.ApiService/Infrastructure/Extensions/MartenConfigurationExtensions.cs
    • •Register:
      csharp
      options.Projections.Add<AuthorDashboardProjection>(ProjectionLifecycle.Async);
  3. •

    Indexing

    • •Add indexes in ConfigureIndexes if you need to query by fields other than Id.

Related Skills

  • •/scaffold-single-stream-projection: If you only need data from one stream.
  • •/scaffold-event-projection: If you need 1:1 transformation without aggregation.