MongoDB One-to-One relationship tutorial with Mongoose NodeJs Tutorial

MongoDB One-to-One relationship tutorial with Mongoose NodeJs Tutorial
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A one-to-one relationship in MongoDB refers to a type of data association where one document in a collection is associated with exactly one document in another collection. In other words, it's a relationship where each document in one collection corresponds to exactly one document in another collection, and vice versa.

Embedding (Composition):
In this approach, you store the related data as a subdocument within the parent document. This is similar to creating a nested object within the parent document. Embedding is appropriate when the related data is a fundamental part of the parent document and does not make sense on its own. For example, if you have a User document and each user has a single Profile, you might embed the Profile data within the User document.
Linking (Referencing):
In this approach, you store a reference to the related document's _id in the parent document. The actual related data resides in a separate collection. Linking is suitable when the related data can exist independently and might be associated with multiple documents. Continuing with the user and profile example, you would store the Profile data in a separate collection and reference its _id in the User document.

In a one-to-one relationship, there are two ways to establish the connection between the documents:

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