Скачать или смотреть Creating an Array Entry in MongoDB with ObjectId and Number

Learn how to create a well-structured MongoDB document with an array entry containing `ObjectId` and `Number` using Mongoose. Effective tips and examples included!
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How to Create an Array Entry in MongoDB with ObjectId and Number

If you're new to MongoDB and working with Mongoose, you might encounter challenges when trying to create an array within a document that includes fields like ObjectId and Number. One common question that arises is how to properly define your schema and ensure that documents are created as expected. In this article, we will guide you through the process of creating an array entry, clarify where you might go wrong, and provide a solution to ensure your entries are structured correctly.

The Problem

You are trying to create a MongoDB entry that resembles the following structure:

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

You’ve defined a schema in Mongoose, but upon processing your request, you found that an unexpected _id key was added to your resources array. You're left wondering what went wrong and how to resolve this issue.

Understanding the Schema Declaration

First, let’s look at the schema you defined:

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

This schema correctly sets up the basic structure you want. However, MongoDB automatically adds an _id field to subdocuments unless explicitly stated otherwise. This is where your confusion arises.

The Default Behavior of Mongoose

When you declare an array of objects like resources, Mongoose automatically creates an _id field for each item within that array. This is helpful in many scenarios, but it can lead to unexpected results if you want to maintain a clean structure without those extra properties.

The Solution

To avoid having an unnecessary _id field in your array, you can simply disable this behavior by modifying your schema. Here’s how to update your schema declaration:

Updated Schema without _id

Add a property to indicate that you don’t want an _id key for each item in the array:

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

This adjustment allows you to keep your entry clean and structured as you intended. The resources will now be created as follows:

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

Summary

In summary, when creating an array entry in MongoDB using Mongoose, be aware of the default behavior where an _id field is added to each subdocument. By making a small modification to your schema to disable this automatic addition, you can maintain the desired structure without any unnecessary fields.

Remember to always test your schema updates and check the created documents to ensure everything is working according to your expectations. Happy coding!