Скачать или смотреть How to Fix the Type object is not iterable Error in Django Rest Framework

Learn how to resolve the `Type object is not iterable` error in Django Rest Framework with this easy guide.
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This video is based on the question https://stackoverflow.com/q/68697783/ asked by the user 'Vakindu' ( https://stackoverflow.com/u/3639372/ ) and on the answer https://stackoverflow.com/a/68699607/ provided by the user 'Alexandr Tatarinov' ( https://stackoverflow.com/u/6627564/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Troubleshooting the Type object is not iterable Error in Django Rest Framework

When working with Django Rest Framework (DRF), you may encounter a frustrating error: TypeError: 'type' object is not iterable. This error can arise when you are trying to access your REST API, resulting in an Internal Server Error. In this guide, we will dive into the potential cause of this issue and provide a straightforward solution to resolve it.

Understanding the Problem

The error occurs when you attempt to fetch data from your API endpoint but receive a 500 Internal Server Error response instead. In the provided traceback, you can see messages indicating that the issue stems from the permissions check in your DRF views.

Common Code Snippet Indicating the Issue:

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This line of code is trying to iterate over self.get_permissions(), and the error suggests that what it's receiving is not an iterable object, which leads us to investigate how you've set up the permission classes in your settings.py file.

Identifying the Cause

Upon closer inspection, the problem lies in the way you've specified the DEFAULT_PERMISSION_CLASSES. Here’s a look at the code from your settings.py:

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The missing comma at the end of the DEFAULT_PERMISSION_CLASSES declaration means that instead of being treated as a tuple, it’s being seen as a single scalar value. This directly leads to the TypeError you're encountering because the DRF expects an iterable (like a tuple) to allow for multiple permission classes.

The Solution

To resolve the error, you just need to add a comma after the IsAuthenticated permission class in settings.py:

Correct Code Snippet:

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Adding the comma converts it back into a tuple, making it iterable, and your API should now function as expected.

Conclusion

Errors like Type object is not iterable can be tricky to diagnose, but they often stem from small omissions in the code. In this case, by simply ensuring that your permission classes are defined correctly as an iterable, you can resolve the issue and continue leveraging Django Rest Framework for building robust APIs.

If you ever face similar errors, scrutinize your code for configuration issues, as they might lead to unexpected results. Happy coding!