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Hands-On Domain-Driven Design with .NET Core

You're reading from   Hands-On Domain-Driven Design with .NET Core Tackling complexity in the heart of software by putting DDD principles into practice

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Product type Paperback
Published in Apr 2019
Publisher Packt
ISBN-13 9781788834094
Length 446 pages
Edition 1st Edition
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Author (1):
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Alexey Zimarev Alexey Zimarev
Author Profile Icon Alexey Zimarev
Alexey Zimarev
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Table of Contents (14) Chapters Close

Preface 1. Why Domain-Driven Design? FREE CHAPTER 2. Language and Context 3. EventStorming 4. Designing the Model 5. Implementing the Model 6. Acting with Commands 7. Consistency Boundary 8. Aggregate Persistence 9. CQRS - The Read Side 10. Event Sourcing 11. Projections and Queries 12. Bounded Context 13. Other Books You May Enjoy

Cross-aggregate projections

When people start doing event sourcing, one mistake that often happens is that developers try to get into the comfort zone of the persisted state of their aggregates as soon as they can. So, many interpret read models as a way to keep the aggregate state accessible in a query able store. I have done the same thing in the past, so you can trust me on that. For the purpose of keeping an aggregate state in some database, I used a nice feature of Event Store—internal projections. You can check the list of available internal projections by visiting the Projections page of the Event Store web UI. One of those projections is $by-category, which links all events to special category streams. For example, $ce-ClassifiedAd will contain all events for the ClassifiedAd aggregate. You can inspect it yourself by visiting http://localhost:2113/web/index.html...

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