Скачать или смотреть How to Delete an Array of Entities in PostgreSQL with NestJS and Sequelize

Learn how to effectively delete an array of entities in a NestJS application using PostgreSQL and Sequelize, including practical code examples and step-by-step guidance.
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This video is based on the question https://stackoverflow.com/q/76849896/ asked by the user 'Amit ben ezra' ( https://stackoverflow.com/u/22286934/ ) and on the answer https://stackoverflow.com/a/76850014/ provided by the user 'Maimoona Abid' ( https://stackoverflow.com/u/22213656/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Delete an Array of Entities in PostgreSQL with NestJS and Sequelize

In modern web development, working with databases to manage data is a common task. In this post, we will solve a specific issue regarding how to delete an array of entities from a PostgreSQL database using NestJS with Sequelize. This functionality is crucial for applications that need to manage large sets of data efficiently.

Understanding the Problem

You may have faced a scenario where you want to delete multiple entries from your database at once. In a NestJS application with Sequelize, you might encounter an error indicating that the method you are trying to use doesn’t exist, such as the absence of a bulkDelete function.

For instance, you may have the following code snippet:

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

In this case, you receive an error stating: "Property 'remove' does not exist on type 'typeof Answer'." This indicates that you need a different approach for deleting multiple records effectively.

The Solution: Deleting Documents in Bulk

Step 1: Implement the Delete Functionality in DocumentService

To handle the deletion of an array of entities, we will create a method in the DocumentService.

Here’s how you can define the deleteDocuments method:

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

Step 2: Set Up the Delete Route in DocumentController

Next, you need to handle the delete request in your controller. This involves creating a route that accepts an array of document IDs to delete. Below is how you can implement this in your DocumentController:

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

Breakdown of the Code

Document Deletion Logic:

The deleteDocuments method in the DocumentService uses Sequelize’s destroy function. The where condition matches the documents whose IDs are passed to the method.

HTTP Delete Request:

The deleteDocuments method in DocumentController is decorated with @ Delete(), indicating that it handles DELETE requests. It accepts an array of IDs in the request body.

Response:

After deleting the specified documents, it returns a confirmation string: "Documents deleted".

Conclusion

By following the outlined steps, you can successfully delete an array of entities in your PostgreSQL database using NestJS and Sequelize. This approach eliminates the error you encountered and effectively manages the lifecycle of your data.

If you have any questions or encounter issues while implementing this solution, feel free to reach out for further assistance!