👀 Views: 69 💬 Answers: 1 📅 Created: 2025-06-10

django forms validation json database Python

I've spent hours debugging this and I'm integrating two systems and I'm working on a Django application where I created a custom form field that processes a JSON string into a Python dictionary. However, when I submit this form, I encounter an `IntegrityError` stating that the 'column_name' want to be null, despite my field being marked as required. I've defined the custom field like this: ```python from django import forms import json class JSONField(forms.Field): def to_python(self, value): if value: try: return json.loads(value) except json.JSONDecodeError: raise forms.ValidationError('Invalid JSON') return {} class MyForm(forms.Form): json_data = JSONField(required=True) ``` In my view, I handle the form submission like this: ```python from django.shortcuts import render, redirect from .forms import MyForm def my_view(request): if request.method == 'POST': form = MyForm(request.POST) if form.is_valid(): # Save to the database, which has a column 'column_name' that want to be null MyModel.objects.create(column_name=form.cleaned_data['json_data']) return redirect('success') else: form = MyForm() return render(request, 'my_template.html', {'form': form}) ``` When I submit the form with valid JSON, it still raises this behavior. I've checked that the `json_data` field is being populated correctly in `cleaned_data`, and I log it before creating the object. The output is correct, yet the database still throws an behavior. I suspect there may be something wrong with how Django is handling the custom field during validation. I'm using Django 4.0.2 and PostgreSQL for my database. Has anyone encountered a similar scenario or can provide guidance on how to debug this further? This is happening in both development and production on Ubuntu 22.04. Thanks in advance!