Handling django.db.utils.IntegrityError for Asynchronous POSTs in Django

A guide on how to effectively handle `IntegrityError` in Django when creating objects asynchronously. Solution and code snippets included.
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The Problem

Suppose you have a Django model defined with a unique slug field. It is crucial that every slug generated from a title remains unique to prevent any duplication. Below is a snippet of a model with a pre-create signal that generates slugs:

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

While this approach works flawlessly when creating items one after the other synchronously, the challenges arise when multiple items are created simultaneously through asynchronous calls, like so:

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

In this case, if both requests attempt to create an item with the same slug at the same time, you will encounter an error:

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

The Solution: Handling IntegrityError

You might wonder, can we catch this IntegrityError? Yes, absolutely! The solution is to override the create method of your Item view to include error handling logic for IntegrityError. Here’s how you can do it effectively:

Step-by-step Implementation

Override the Create Method:
You can override the view's create method to control how you handle incoming requests and catch integrity errors. Here’s a revised implementation:

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

Test Asynchronous Creation:
With this updated create method, you can now successfully handle cases where IntegrityError might occur during asynchronous POST requests. The method retries the creation process up to three times, ensuring that even with concurrent requests, you can achieve unique slugs without unnecessary database writes.

Conclusion

Feel free to implement this solution and improve your application's error-handling capabilities when dealing with asynchronous POST requests!