'>' not supported between instances of 'dict' and 'dict' in Django 3.0

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I am using Django 3.0 and Python 3.7

here is my views.py

@login_required
def updated_status(request, pk):
    s1 = []
    purchase_quantity = Item.objects.filter(order_id=pk)
    data = set()
    a = [x.id for x in purchase_quantity if x.id not in data and not data.add(x.id)]
    stock_quantity = Stock.objects.filter(other_id=pk)
    data1 = set()
    b = [x.other_item.id for x in stock_quantity if
         x.other_item.id not in data1 and not data1.add(x.other_item.id)]
    if data == data1:
        for j in data1:
            stock_quantity = Stock.objects.filter(other_order_id=pk,
                                                           other_item_id=j).aggregate(Sum('quantity'))
            purchase_quantity = Item.objects.filter(
                    other_id=pk, id=j).aggregate(Sum('quantity'))
            if stock_quantity > purchase_quantity:
                Order.objects.filter(id=pk).update(flag=1)
            if stock_quantity >= purchase_quantity:
                s1.append('true')
            else:
                s1.append('false')
            if 'false' in s1:
                Order.objects.filter(id=pk).update(status=3)
            else:
                Order.objects.filter(id=pk).update(status=2)
    else:
        pass
    return redirect(reverse('get_list_data'))

How could i solve this issue " TypeError: '>' not supported between instances of 'dict' and 'dict' "

python-3.x django-views django-models django python
2 Answers

try this

Django aggregate return dict object.

https://docs.djangoproject.com/en/4.0/topics/db/aggregation/

for j in data1:
    stock_quantity = StockMovements.objects.filter(other_order_id=pk, other_order_item_id=j).aggregate(Sum('quantity'))
    purchase_item_quantity = OtherOrderItem.objects.filter(other_order_id=pk, id=j).aggregate(Sum('quantity'))
    if stock_quantity.get('quantity__sum') > purchase_item_quantity.get('quantity__sum'):
        OtherOrder.objects.filter(id=pk).update(flag=1)
    if stock_quantity.get('quantity__sum') >= purchase_item_quantity.get('quantity__sum'):
        pass

aggregate() is a terminal clause for a QuerySet that, when invoked, returns a dictionary of name-value pairs. The name is an identifier for the aggregate value; the value is the computed aggregate. The name is automatically generated from the name of the field and the aggregate function. If you want to manually specify a name for the aggregate value, you can do so by providing that name when you specify the aggregate clause:

user_56004520

Both stock_quantity and purchase_quantity are dictionaries here: you need to unwrap the item from the dictionary, so:

stock_quantity = StockMovements.objects.filter(
    other_order_id=pk, other_order_item_id=j
).aggregate(Sum('quantity'))['quantity__sum']
purchase_item_quantity = OtherOrderItem.objects.filter(
    other_order_id=pk, id=j
).aggregate(Sum('quantity'))['quantity__sum']
user_675790
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