Re: Improvement: documentation example for extra Manager methods
On 13 nov, 14:53, "[EMAIL PROTECTED]" <[EMAIL PROTECTED]> wrote:
> Hi,
>
> I am building a custom Manager for adding extra methods that return
> filtered querysets.
> I believe this is a common case for custom Managers.
Yes, indeed.
> Digging into the documentation [1], the only example emphasises on the
> ability to return anything from a Manager method. However, I miss a
> standard example for methods that DO return a filtered queryset.
> I am still struggling with my custom Manager method, which raises an
> error in my project ('NoneType' object has no attribute '_meta'). Any
> hint?
Not without the relevant source code and the full traceback. Sorry, my
crystall ball is out for repair.
> My custom Manager method is like this:
> def active(self):
> return self.get_query_set().filter(status=STATUS_ACTIVE)
or more simply:
return self.filter(status=STATUS_ACTIVE)
But this won't solve your problem anyway.
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Re: Improvement: documentation example for extra Manager methods
I found the origin on my error ('NoneType' object has no attribute
'_meta').
I used a wrong (old?) syntax for adding custom Manager to my Model:
ModelClass.objects = MyCustomManager() # After Model and Manager
definitions
My custom Manager should have been attached in the model definition
(as found in the Manager documentation):
objects = MyCustomManager() # And manager definition had to be moved
before the Model definition
Still, my initial message is valid: there is no standard example about
custom Manager method that returns a filtered queryset :-)
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Improvement: documentation example for extra Manager methods
Hi,
I am building a custom Manager for adding extra methods that return
filtered querysets.
I believe this is a common case for custom Managers.
Digging into the documentation [1], the only example emphasises on the
ability to return anything from a Manager method. However, I miss a
standard example for methods that DO return a filtered queryset.
I am still struggling with my custom Manager method, which raises an
error in my project ('NoneType' object has no attribute '_meta'). Any
hint?
My custom Manager method is like this:
def active(self):
return self.get_query_set().filter(status=STATUS_ACTIVE)
Based on your feedback, I could raise a ticket for updating the
documentation.
Thanks.
[1]
http://docs.djangoproject.com/en/dev/topics/db/managers/#adding-extra-manager-methods
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