Mongoose Schema Not Creating Fields with Default Values in MongoDB
Tags: javascript, node, mongodb, mongoose
Published: 2023-08-15 20:01:02

Mongoose Schema Not Creating Fields with Default Values in MongoDB
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As a software developer working with MongoDB and Mongoose, you may encounter a situation where the fields in your Mongoose schema are not being created with their default values in MongoDB. This can be a frustrating issue to debug, but fear not, as we'll explore some common causes and potential solutions in this article.

One possible reason for this issue is that you might be defining your default values incorrectly in the Mongoose schema. Make sure you are using the correct syntax for setting default values. For example, if you want to set a default value of 0 for a numeric field, your schema definition should look like this:

`const mySchema = new mongoose.Schema({ myField: { type: Number, default: 0 } });`

Another common mistake is forgetting to call the `.model()` function on your schema to create the Mongoose model. Double-check that you have properly created the model using your schema definition. Without the model, your schema won't be able to create the corresponding fields in MongoDB.

Additionally, if you have an existing MongoDB collection and you're trying to add a new field with a default value to your Mongoose schema, the default value won't be applied to the existing documents. The default value is only used when creating new documents. To update the existing documents with the default value, you can use the `.updateMany()` method in Mongoose or run a MongoDB update query directly.

Lastly, it's important to note that Mongoose only applies the default values when you create a new document without explicitly setting a value for the field. If you provide a value for the field, even if it matches the default value, Mongoose will use the provided value instead. This behavior is by design to allow flexibility in setting field values.

Debugging issues with default values not being applied can be challenging, but with careful examination of your schema definition, model creation, and understanding of default value behavior, you can resolve this problem. Remember to double-check your syntax, ensure you have created the model correctly, and be aware of how default values work in Mongoose.

### References:

*   [Mongoose Documentation](https://mongoosejs.com/docs/guide.html)
*   [MongoDB Documentation - Default Values](https://docs.mongodb.com/manual/core/schema-validation/#default-values)

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