How to Update a Document in MongoDB with Related Data from Other Collections

Learn how to update a document in MongoDB by fetching data from related collections with a step-by-step guide and example code.
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How to Update a Document in MongoDB with Related Data from Other Collections

Navigating the complexities of MongoDB can often be a challenge, especially when it comes to updating documents based on information from related collections. In this post, we'll explore how to update a field in one collection using data from another by breaking down the process into clear and easy-to-follow steps.

The Problem

Imagine you have three collections in your MongoDB database: User, Store, and Map. Your goal is to update the storeCommunicationEmailId field in the Store collection based on information found in the User collection. The condition for this update is that the _id of the user matches the serviceProviderAdminId from the Map collection and that the storeId in the Map collection matches the _id in the Store collection.

Here's a quick snapshot of the collections:

Map Collection

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User Collection

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Store Collection

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Desired Result for Store Collection

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The Solution

To achieve this, we will define a function that performs the following tasks:

Find the Relevant User: Query the User collection to locate the user whose _id matches the serviceProviderAdminId from the Map collection.

Update the Store: Once the user's email is obtained, we will use it to update the storeCommunicationEmailId field in the Store collection where the _id matches the storeId.

Step-by-Step Implementation

Here's how we can structure our code to accomplish the task:

[[See Video to Reveal this Text or Code Snippet]]

Key Points to Remember

Always ensure that the serviceProviderAdminId and storeId are passed correctly to the function.

Use the $set operator in your update query to modify specific fields in a document.

The new: true option in the update function ensures that the updated document is returned.

Conclusion

Updating a document in MongoDB using data from related collections might seem daunting at first, but with a clear structure and methodology, it becomes manageable. By following the steps outlined above, you can dynamically update your Store collection based on related user data, which can be incredibly useful for applications needing consistent data management.

Now you have a better understanding of how to tackle similar MongoDB queries. If you have any questions or need further assistance, don't hesitate to reach out!