implementing Django Forms and Model Validation: Custom Validation Not Triggering
I'm converting an old project and I'm optimizing some code but I'm relatively new to this, so bear with me. I'm working on a personal project and I'm working with an scenario where my custom validation method in a Django form isn't being triggered as expected. I've defined a model with a field that has specific requirements, and I'm trying to enforce additional validation in my form. However, when I submit the form with invalid data, it seems like the model validation occurs, but my custom validation method is not firing. Here's the relevant model definition: ```python from django.db import models class Product(models.Model): name = models.CharField(max_length=100) price = models.DecimalField(max_digits=10, decimal_places=2) ``` And here is my form where I attempt to add custom validation: ```python from django import forms from .models import Product class ProductForm(forms.ModelForm): class Meta: model = Product fields = ['name', 'price'] def clean_price(self): price = self.cleaned_data.get('price') if price <= 0: raise forms.ValidationError('Price must be greater than zero.') return price ``` In my view, I'm using the form like this: ```python from django.shortcuts import render, redirect from .forms import ProductForm def create_product(request): if request.method == 'POST': form = ProductForm(request.POST) if form.is_valid(): form.save() return redirect('product_list') else: form = ProductForm() return render(request, 'create_product.html', {'form': form}) ``` When I submit the form with a price of 0, I get the default model validation behavior for the price field, but my `clean_price` method doesn't seem to trigger at all. I've checked the `cleaned_data` dictionary and it only contains the model's built-in validation errors. I'm using Django 4.0.3 and I’ve tried calling `super().clean()` in my `clean_price` method, but that didn't seem to help either. What could be going wrong here? Why isn't my custom validation logic executing? I'm looking for insights into how Django's validation processes work, particularly how model and form validations interact. I'm working on a service that needs to handle this. Am I missing something obvious? My development environment is Ubuntu 20.04. Any ideas how to fix this? This is for a mobile app running on macOS. What are your experiences with this? Could someone point me to the right documentation?