Dear Russell,
Many thanks to you. That works !
The following session goes on Django 1.1.1 with no problem
>>> opts=B._meta
>>> fk_field=[f for f in opts.fields if f.get_internal_type() ==
>>> "ForeignKey"][0]
>>> fk_field.rel.to.objects.all() # this successfully get the queryset of A
Thank you again.
John Wang
2009-12-04
-------------------------------------------------------------
From: Russell Keith-Magee
Date: 2009-12-04 10:11:16
To: django-users
Cc:
Subject: Re: How can I know the foreign key model at runtime ?
On Fri, Dec 4, 2009 at 10:01 AM, John Wang <john.wang...@gmail.com> wrote:
> Hi all,
>
> let me express my question more simple and easy to understand.As we
> know we can access the manager B through A as the following:
>
>>>> manager_of_b = a.b_set # get the manager of B
>>>> queryset_b = manager_of_b.all() # get all instance of B
>
> now how can I access the manager of A through class B? e,g I want to:
>
>>>> manager_of_a = B.some_api_i_dont_know
>>>> queryset_a = manager_of_a.all()
>>> B.fk.field.rel.to
will effectively return you the class "A", so
>>> B.fk.field.rel.to.all()
will return all instances of A.
You can also get this by inspecting the _meta attribute of B:
>>> B._meta.get_field('fk').rel.to
Yours,
Russ Magee %-)
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