> c = Greeting.count + 1
> TypeError: unsupported operand type(s) for +=: 'IntegerProperty'
> and 'int'
Inside a method of the Greeting class you don't reference the count
property with the class name but with 'self'.
If you use Greeting.count you are using the class variable 'count' not
the instance property 'count'.
class Greeting(db.Model):
count = db.IntegerProperty(required=True)
def myMethod(self):
c = self.count + 1
2009/4/8 Mel T. <[email protected]>:
>
> Hi,
>
> I come from another language and framework world, thus I am new to
> python and gae so please excuse my ignorance.
>
> I get this error when I call a method I added to a db.Model derived
> class:
>
> c = Greeting.count + 1
> TypeError: unsupported operand type(s) for +=: 'IntegerProperty'
> and 'int'
>
> To reproduce that, I simplified my problem to modifying the HelloWorld
> Greetings application. I added this to the Greetings class:
>
> # add a count property to the model
> count = db.IntegerProperty(required=True)
>
> # add a function that uses the count
> def inc_count(self):
> c = Greeting.count + 1
>
>
> Then, in the sample code further down, in the class Guestbook,
> function post(self), I replaced the first line (instantiation of a
> Greeting) with this:
>
> greeting = Greeting(count=4)
> greeting.inc_count()
>
> The call to greeting.inc_count() causes the error pasted above. Why is
> that?
>
> --
> Mel T.
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