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领域驱动设计（DDD）前些年很火，因为近两年2B和SAAS越来越受关注。但不少人读过Eric Evans的《领域驱动设计》和Vaughn Vernon的《实现领域驱动设计》后，都很懵，太抽象。 本文在介绍领域驱动设计的基本概念的同时，用一个虚拟的公司和一个虚拟的项目，介绍领域驱动设计的落地实践，帮助大家了解. In other words, in ddd, model is a model of the domain. Ddd (domain driven design) is a useful concept for analyse of requirements of a project and handling the complexity of these requirements.before that people were analysing these requirements with considering the relationships between classes and tables and in fact their design were based on database tables relationships it is not old but it has.

Before attempting ddd, you should be familiar with design patterns and enterprise design patterns Model in django models, are entities Knowing these makes ddd a lot easier to grasp

And, as mentioned above, there is a free introduction to ddd available from infoq (where you can also find talks about ddd).

Suppose we have some business logic which depends on data being retrieved and then persisted, should it always be the application layer which is orchestrating this In an idealized setting, you have clean separation of concerns The domain model computes things using information already available in local memory, and the application code that orchestrates the copying of information from/to. Api clients should be designed with domain in mind too

Otherwise you lose most of benefits of ddd. An aggregate is a cluster of associated objects that we treat as a unit for the purpose of data changes Each aggregate has a root and a boundary The boundary defines what is inside the aggregate

The root is a single, specific entity contained in the aggregate

The root is the only member of the aggregate that outside objects are allowed to hold references to [.] this. Sure you can probably just add a repository interface to entity a for reading entities b But the risk is that you expose knowledge for how to persist b. In ddd, there is also the concept of a domain entity, which has a unique identity to it

As i understand it, a user is a good example of an entity (unique userid, for instance) Can someone explain the difference between domain and application services by providing some examples And, if a service is a domain service, would i put the actual implementation of this service w. Please note 'model' in ddd is 'domain model' which consists of entities, value objects, services, repositories, aggregates, aggregate roots and whatever else is needed to represent the domain in question

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