Скачать или смотреть Resolving the AttributeError for phone_number Serialization in Django Rest Framework

Learn how to fix the `AttributeError` you encounter when trying to serialize the `phone_number` field in Django Rest Framework with our step-by-step guide.
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This video is based on the question https://stackoverflow.com/q/65353259/ asked by the user 'lord stock' ( https://stackoverflow.com/u/14689289/ ) and on the answer https://stackoverflow.com/a/65353286/ provided by the user 'Davit Tovmasyan' ( https://stackoverflow.com/u/5840704/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Resolving the AttributeError for phone_number Serialization in Django Rest Framework

In the world of Django Rest Framework (DRF), handling attributes across related models can sometimes be tricky, especially when you encounter an AttributeError. If you’ve stumbled upon the error message: "Got AttributeError when attempting to get a value for field phone_number on serializer ListBusCompanyStaffSerializer", worry not! This guide will guide you through understanding the error and provide a straightforward solution.

Understanding the Problem

You are working with two Django models: User and BusCompanyStaff. The User model contains a phone_number field while the BusCompanyStaff model includes a foreign key relationship to the User. When you try to serialize the BusCompanyStaff instance to include phone_number, DRF raises the aforementioned AttributeError. This happens because BusCompanyStaff itself does not directly contain the phone_number field; it is part of the related User model.

Here's a quick overview of your models:

User: Contains the phone_number field.

BusCompanyStaff: Has multiple associations, notably with the User, but does not directly include a phone_number field.

The Solution: Modify the Serializer

To solve the issue, you need to modify your ListBusCompanyStaffSerializer to correctly reference the phone_number field from the associated User model. Here’s how to do it step-by-step:

Step 1: Update the Serializer Code

You will need to specify that the phone_number field in the serializer should take its value from the User instance associated with BusCompanyStaff. You can achieve this using the source argument in the serializers.CharField().

Here’s the updated code for your ListBusCompanyStaffSerializer:

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

Explanation of the Changes:

phone_number = serializers.CharField(source='user.phone_number'): This line tells the serializer to pull the phone_number value directly from the related User model. By using the source attribute, you can access nested fields seamlessly in DRF.

Step 2: Review Related Methods

Make sure that the rest of your view and use case methods that handle the BusCompanyStaff data are appropriately fetching this data:

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

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

Conclusion

By following these steps, you should be able to successfully serialize the phone_number from the related User model without running into AttributeError. This method ensures that your DI framework relationships work seamlessly, allowing you to extract and present data across connected entities effectively.

Happy Coding! If you have further questions or need clarification on any part of this implementation, feel free to reach out in the comments below.