Contents
What are domain aggregates?
Aggregate is a pattern in Domain-Driven Design. A DDD aggregate is a cluster of domain objects that can be treated as a single unit. An example may be an order and its line-items, these will be separate objects, but it’s useful to treat the order (together with its line items) as a single aggregate.
What are aggregates explain with example?
For example, educators, students, and parents in a school district may be surveyed on a topic, and the information and comments from those surveys could then be “aggregated” into a report that shows what the surveyed individuals generally think and feel about the issue.
What are the two types of aggregates?
The Different Types Of Aggregate. The categories of aggregates include gravel, sand, recycled concrete, slag, topsoil, ballast, Type 1 MOT, and geosynthetic aggregates (synthetic products commonly used in civil engineering projects used to stabilise terrain).
What does aggregate mean in Domain Driven Design?
Having experienced the pain of delving into it for the last few months from 0 understanding of DDD, I hope it would help beginners who would possibly have to go through the same things. An aggregate is an encapsulation of entities and value objects (domain objects) which conceptually belong together.
Do you have to be a domain object for aggregate root?
The Aggregate root doesn’t necessarily need to be a Domain Object. For the sake of keeping Separation of Concerns between Domain objects, it’s generally a good thing when the aggregate root is a separate object with no business logic.
Which is the best example of an aggregate?
An aggregate is an encapsulation of entities and value objects (domain objects) which conceptually belong together. It also contains a set of operations which those domain objects can be operated on. As a concrete example, an aggregate might be a Car, where the encapsulated domain objects might be Engine, Wheels,
How to identify the’right’aggregate root?
To make it easier to identify the ‘right’ Aggregate Root, consider a different approach where Domain Objects are based on the functional high-level business requirements – i.e. choose nouns which allude to functional requirements and/or behaviours that users of the system need to perform.