Fixing the Issue of Modelform Not Saving Data in Django

Encountering issues with Django's `Modelform` not saving data? Discover the reasons behind this problem and how to resolve it effectively!
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This video is based on the question https://stackoverflow.com/q/67045602/ asked by the user 'INGl0R1AM0R1' ( https://stackoverflow.com/u/12845199/ ) and on the answer https://stackoverflow.com/a/67046006/ provided by the user 'willeM_ Van Onsem' ( https://stackoverflow.com/u/67579/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Fixing the Issue of Modelform Not Saving Data in Django

When working with Django, you may find yourself facing various challenges, one of which is dealing with forms that seem to execute successfully but do not save data to the database. This issue can be particularly frustrating, especially when there are no clear error messages to indicate what went wrong. In this guide, we'll explore one such scenario where the Modelform is not saving data, even though the form.save() command appears to be working.

Understanding the Problem

In the case presented, the user encountered the following problems:

The form's save() method was being executed.

The data was visible in the print statements, and a success message was shown.

However, upon checking the database through the admin page, no new records were found.

Model and Form Overview

To understand the setback, let's look at the essential components involved: the Django model and the form.

Model Definition:

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

Form Definition:

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

Analyzing the View

In the view responsible for handling form submissions, the following snippet raised questions:

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

The Mistake

The problem lies in the line instance=request.user. In Django, the instance parameter in a form should reference an instance of the model being modified or created. Here, it was incorrectly set to the logged-in user, which is not related to the DadoDB model. This means that instead of creating a new DadoDB entry, the form was attempting to update the user record, which wouldn’t contain the fields defined in the DadoDB model.

Solution: Correctly Setting the Instance

To resolve this issue, you need to adjust how the form is instantiated in the POST request. Instead of setting the instance to the currently logged-in user, you'll create a new form instance without that parameter and then associate the user with the new DadoDB instance when saving.

Adjusted View Code

Here's how the updated view should look:

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

Conclusion

By ensuring that the form instance is correctly instantiated without the request.user, and by manually setting the autor attribute before saving, you can resolve the issue of Modelform not saving data in Django. This adjustment not only fixes the immediate problem but also clarifies your code, making it easier to understand for future maintenance.

If you're facing similar issues, taking the time to analyze your code and understand the responsibility of each component can save you from frustration. Happy coding!

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