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Discussion on: Designing a better architecture for a Node.js API

 
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Thiago Pacheco

But remember that this is not the same concept of joining as in SQL, in MongoDB you don't have this concept of relationship.
The relationship is defined by code, with your schemas and the extra validations you are supposed to create based on your necessities.

Here is some more information about the key differences between NoSQL and SQL:
mongodb.com/nosql-explained/nosql-...