Why not create a Manager?
Give it a method foo1_related() which then returns something like
self.foo1_set.filter( your filters ) and a similar method foo2_related (if
needed).
You can then call A.foo1_related() and get what you need.
Best regards,
Martin
On Tue, Jun 7, 2011 at 4:08 PM, mhulse <rgmi...@gmail.com> wrote:
> Hello,
>
> I have a M2M field...
>
> class A(models.Model):
> foo1 = models.ManyToManyField('B', related_name='foo1_set' ...)
> foo2 = models.ManyToManyField('B', related_name='foo2_set' ...)
> ...
>
> When I run:
>
> ...foo.select_related()
>
> I get all of the B entries related to A instance.
>
> I would like to write a method similar to select_related() (I need to
> customize the query), but I am not sure how to implement such a query.
>
> I have been hammering at this all day, and I gave up on the idea of writing
> my own select_related() method and I have most recently tried:
>
> Failure #1:
>
> Add the below method to class A:
>
> def custom_select_related(self):
> if self.foo1:
> return self.foo1.select_related()
> elif self.foo2:
> return self.foo2.select_related()
> else:
> return None
>
> Failure #2:
>
> Added the similar method as above, except I replaced replaced
> select_related() with foo1/foo2_set.
>
> ...
>
> What I really need is to implement similar functionality as
> select_related()... I am just not sure how or where. Is this a model
> manager?
>
> Could someone kick me in the right direction here? :D
>
> Please let me know if I can post more code and/or explain my situation
> better.
>
> Thanks so much!
>
> Cheers,
> Micky
>
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