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Date: Thu, 17 Nov 2011 08:44:23 +0200
Subject: Re: staticmethod makes my brain hurt
From: Dotan Cohen <dotancohen@gmail.com>
To: Roy Smith <roy@panix.com>
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On Thu, Nov 17, 2011 at 04:30, Roy Smith <roy@panix.com> wrote:
> When I run this (python 2.6.1):
>
> class C:
> =C2=A0 =C2=A0@staticmethod
> =C2=A0 =C2=A0def foo():
> =C2=A0 =C2=A0 =C2=A0 =C2=A0pass
>
> =C2=A0 =C2=A0print "inside", foo, callable(foo)
>
> print "outside", C.foo, callable(C.foo)
>
> I get:
>
> inside <staticmethod object at 0x421df0> False
> outside <function foo at 0x41e6f0> True
>
> I don't understand. =C2=A0Why is foo not callable inside of the class
> definition? =C2=A0Where this comes up is that I'm trying to use a callabl=
e
> default in mongoengine:
>
> class User(Document):
> =C2=A0 =C2=A0@staticmethod
> =C2=A0 =C2=A0def _get_next_id():
> =C2=A0 =C2=A0 =C2=A0[blah, blah, blah]
> =C2=A0 =C2=A0 =C2=A0return id
>
> =C2=A0 =C2=A0user_id =3D IntField(required=3DTrue, default=3D_get_next_id=
)
>
> The way mongoengine works is if callable(default) is true, it calls
> default() to get the real value to use. =C2=A0At the point where the
> IntField() call is made, _get_next_id is not callable, and eventually I
> end up with:
>
> ValidationError: <staticmethod object at 0x2a3c1a0> could not be
> converted to int

Try this (untested):

class C:
   @staticmethod
   def foo():
       pass

   print "inside", C.foo, callable(C.foo)



--=20
Dotan Cohen

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