CODEWITHSUNDEEP
pythondjango
apollos
apollos

Reputation: 323

How can I check User Input value again Django Models and Forms

I don't know how to actually write the logic but I want to check user inputs especially price form field against Product model (price property).

I have model the django form as below:

class SalesForm(forms.ModelForm):
class Meta:
    model = Sales
    fields = ['product', 'customer', 'quantity', 'price']

Here is the Product Model

class Product(models.Model):
name = models.CharField(max_length=100, null=True)
category = models.CharField(max_length=100, choices=CATEGORY, null=True)
cost = models.PositiveIntegerField(null=True)
price = models.PositiveIntegerField(null=True)
quantity = models.PositiveIntegerField(null=True)

Here is what I am trying to do logically in views.py

def user_add_sales(request):

sales = Sales.objects.all().order_by('-salesdate')[:5]
if request.method == 'POST':
    sales_form = SalesForm(request.POST)
    if sales_form.is_valid:
        sales_price = sales_form.cleaned_data('price')
        try:
            user_input = Product.objects.get(price = sales_price)
            sales_form.save()
            messages.success(request, 'Sales Added Successfully')
            return redirect('dashboard-user-sales')
        except user_input.DoesNotExist:
            sales_form = SalesForm()
else:
    sales_form = SalesForm()
context = {
   'sales' : sales,
   'sales_form' : sales_form,
}
return render(request, 'dashboard/user_sales.html', context)

When Try running the code, says 'SalesForm' object has no attribute 'cleaned_data'. Someone should please help me on how I can check whether what the user enters in price field of the SalesForm is not less than the price set for that product in Product Model.

Upvotes: 0

Views: 621

Answers (1)

willeM_ Van Onsem
willeM_ Van Onsem

Reputation: 476659

The form is validated by the sales_form.is_valid() method, not by an attribute, the if condition is thus:

if sales_form.is_valid():
    # …
# …

In your form, you can check if the given price is at least the price in the related attribute with:

class SalesForm(forms.ModelForm):
    # …
    
    def clean(self, *args, **kwargs):
        data = super().clean(*args, **kwargs)
        if data['price'] < data['product'].price:
            raise ValidationError('The price of the sale is below the price of the product')
        return data

Upvotes: 2

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