Hi list,
I'm developing a (yet another) shopping cart and I'm having a problem
when counting the items in the cart.
In my model I have an "Order" class which is the cart and a
"OrderItem" class which are the items in the cart. In the Order class
I have this code:
[PYTHON]
class Order(models.Model):
def count_items(self):
items = 0
for item in self.orderitem_set.filter(order=self):
items += item.quantity
return items
count = property(count_items)
[/PYTHON]
When I run the application I get the error:
[ERROR]
OperationalError at /
(1241, 'Operand should contain 1 column(s)')
Request Method: GET
Request URL: http://localhost:8000/
Exception Type: OperationalError
Exception Value: (1241, 'Operand should contain 1 column(s)')
Exception Location:
/var/lib/python-support/python2.4/MySQLdb/connections.py in
defaulterrorhandler, line 35
Python Executable: /usr/bin/python
Python Version: 2.4.4
[/ERROR]
Something strange is that the exception is thrown while rendering the template:
[ERROR]
Caught an exception while rendering: (1241, 'Operand should contain 1
column(s)')
73 <div class="cartdata">
74 {{ cart.count }} item{{ cart.count|pluralize }}
75 </div>
[/ERROR]
Any idea? Thanks in advance,
AlvAro
"You can't change the world, but you can change your mind."
Software Libre: El conocimiento no puede tener dueño.
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