Question

Model and ModelForm in django project are defined like this :

class Consumption(models.Model):
    date=models.DateTimeField(default=datetime.now)
    product_name=models.ForeignKey(Stock,to_field='product_name')
    quantity=models.IntegerField()
    customer=models.CharField(max_length=50,null=True,blank=True)

    def __unicode__(self):
        return self.product_name

class ConsumptionForm(ModelForm):
    class Meta:
        model=Consumption

    def clean_quantity(self):
        cleaned_data=self.cleaned_data
        product=cleaned_data.get("product_name")
        quantity=int(cleaned_data.get('quantity'))
        stock=Stock.objects.get(product_name=product)
        if quantity > stock.quantity:
            raise forms.ValidationError("Not enough stock")
        return cleaned_data

where Stock class contains product name which serves as Foreign Key to Consumption and and whose quantity should be greater than consumption quantity.

Now the problem is when I enter submit to ConsumptionForm . It gives me error on quantity field as this field must be an integer even after when I am providing it an integer.

What can be the reason of this?

Answer 1

You’re returning the whole cleaned_data dictionary from the clean_quantity method, rather than just the value of quantity.