Identities are the defining characteristic of an entity in Domain-Driven Design. And as soon as the Id is public and leaves its immediate context, other components might use it. For example if service A references by Id an entity from service B, changing the Id of the entity will have a knock-on effect of service A. This is why its important to have several tools in the toolbox. In this blog post we’ll discuss 7 strategies for assigning Ids and their trade-offs.

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