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Practical Microservices: Use of `userId` inside of message `metadata` attribute

ethangarofolo

ethangarofolo

Author of Practical Microservices

Practical Microservices: Use of `userId` inside of message `metadata` attribute

@ethangarofolo

There are a few places in the book where I recommended putting a userId attribute inside of metadata. I consider that advice a mistake now.

metadata is about the mechanics of messaging, and if a user’s id matters to a component’s domain, then it belongs in the data and not the metadata.

Sorry for the confusion, and happy coding!

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