Скачать или смотреть How to Delete the _id Property from a MongoDB Document Using Mongoose in Node.js

Learn how to effectively remove the `_id` property from documents in MongoDB with Mongoose, enabling you to duplicate documents without retaining the original ID.
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How to Delete the _id Property from a MongoDB Document Using Mongoose in Node.js

If you're working with MongoDB and Mongoose in your Node.js application, you might find yourself in a situation where you need to copy a document from one collection to another but want to remove the _id property. The reason for this is that MongoDB automatically generates a new _id for new documents, and retaining the old one can lead to conflicts.

In this guide, we will explore a clear solution to this problem, breaking it down into manageable sections to help you understand and implement the solution easily.

The Problem: Retaining the _id Property

You might be encountering the following issue:

You want to copy a document from the templateinfo collection to the template collection.

However, upon copying, the new document still contains the old _id, which you don't want.

Example Scenario:

Here is an example of a code snippet that attempts to handle this:

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

Despite trying to delete the _id property, you find that it remains in the new document.

The Solution: Using the select Function

The most effective way to exclude the _id property when querying documents is to use the select method provided by Mongoose. This method allows you to specify which fields you want to include or exclude in your query results.

Step-by-Step Implementation

Use the select Function:
By explicitly specifying - _id in your select statement, you can prevent the _id property from being included in the document that Mongoose retrieves.

Code Example:
Below is the revised code that includes the select function to exclude the _id property:

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

Explanation of the Solution:

_id: The minus sign (-) indicates that we want to exclude the _id property from the results.

After executing the query, newdoc will not have the _id property, thus allowing MongoDB to assign a new _id when you save it.

Why This Works:

By changing the query to use select, you ensure that the results returned by MongoDB do not contain the unwanted _id property, which resolves the issue of duplication conflicts.

Conclusion

Removing the _id property from documents you want to copy in MongoDB using Mongoose can be easily accomplished with the select function. This allows for efficient handling of database documents, preventing any issues with document uniqueness.

If you follow the steps outlined in this post, you can effortlessly duplicate documents without retaining their original _id, making your data management more effective.

Now you're equipped with the knowledge to handle this common scenario in your Node.js applications! Happy coding!