Where to place the business logic in Domain-Driven Design (Python example)

• python-ddd

  3 830 5.9 Python

  Python DDD example

  

So an Aggegate Root acts as a facade of the aggregate, and it is responsible of enforcing the aggregate consistency rules. For each public method, the invariants are checked using check_rule method and the business logic is applied to an aggretage. Let's consider an Auction domain as an example. Our use case here is to allow users (sellers) to publish their items for sale (listings) on an auction website similar to Ebay. The business rules are as following:

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