Скачать или смотреть How to Save Additional Fields with Django's CreateView from a Form

Learn how to add and save `additional fields` in your Django model using CreateView, even if they are excluded from the HTML form.
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Saving Additional Fields with Django's CreateView

When working with Django, particularly using CreateView, you might find yourself needing to save extra fields from your model that are not part of your HTML form. This can be especially confusing if you've already defined specific fields to capture user input through a form. In this post, we'll address how you can effectively handle this situation, ensuring all necessary data is saved correctly in your database.

The Problem

You've created a model (My_model) with several attributes, but some of them are excluded from the form shown to the user. Even though your form is successfully capturing other required fields, you want to save the excluded attributes at the same time. Let’s clarify this with our model example:

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

Here's how your CreateView is set up:

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

Currently, you can submit the form, and it saves the filled attributes correctly. However, the excluded fields (attr_1 and attr_2) are not being saved. Let's discuss how you can solve this.

The Solution

Step 1: Override the form_valid Method

To save the additional fields while submitting the form, you can override the form_valid method in your MyModelCreateView. This method allows you to manipulate the form data before it gets saved to the database.

Here's how you do it:

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

In the code above, we assign values to attr_1 and attr_2 right before calling super().form_valid(form), which persists the form data along with the additional fields into the database.

Step 2: Review Your Form Class

Ensure that your form class excludes the fields you do not want to display. Here’s a recap of that setup in your forms.py:

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

Step 3: Ensure URL Patterns are Correct

Lastly, confirm that your URL patterns are set up correctly to point to this view. In your urls.py, it should look like this:

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

This setup will direct the submitted form to the MyModelCreateView, triggering the overridden form_valid method.

Conclusion

With these modifications, you can easily save additional fields in your Django model, even when they are excluded from the HTML form. Leveraging the form_valid method offers a clean and efficient solution to manage additional data during the creation process. Give it a try, and feel free to customize the values being saved to fit your needs!

If you have any questions or need further assistance, don’t hesitate to reach out in the comments below!