在什么时候在 Django 中调用验证器

如何解决在什么时候在 Django 中调用验证器

class TestProduct(models.Model):
    title = models.CharField(max_length=20,unique=True)
    price = models.DecimalField(max_digits=4,decimal_places=2)
    
class TestProductForm(forms.ModelForm):
    class Meta:
        model = TestProduct
        fields = '__all__'

def test_product(request):
    form = TestProductForm()
    context = {'form': form}
    if request.method == 'POST':
        my_form = TestProductForm(request.POST)
        context['form'] = my_form
    return render(request,'test_product.html',context)

我查看了代码，无处调用验证方法 Why is the validation going on,I am clearly a method is_valid don't call?????