Hi saeb,
I believe you misunderstand the purpose of select_related(). When
used, it does the extra database work to retrieve related objects at
the beginning, rather than when you try to access them. Here's an
example:
# in this example, notice how __dict__ isn't populated with the
_site_cache until AFTER we manually refer to the site (f.site.domain)
>>> from feedback.models import Feedback
>>> f = Feedback.objects.get(pk=1)
>>> f.__dict__
{'display_name': u'Keith', 'site_id': 1L, 'comments': u'YAY', 'id':
1L, 'pub_date': datetime.datetime(2008, 8, 1, 23, 35, 7)}
>>> f.site.domain
u'shopfha.com'
>>> f.__dict__
{'display_name': u'Keith', 'site_id': 1L, 'comments': u'hello', 'id':
1L, '_site_cache': <Site: example.com>, 'pub_date':
datetime.datetime(2008, 8, 1, 23, 35, 7)}
# in this example, notice how __dict__ is now populated with the
_site_cache without first referring to the site
>>> from feedback.models import Feedback
>>> f = Feedback.objects.select_related().get(pk=2)
>>> d.__dict__
{'display_name': u'Paul', 'site_id': 1L, 'comments': u"hello", 'id':
2L, '_site_cache': <Site: example.com>, 'pub_date':
datetime.datetime(2008, 8, 1, 23, 37, 41)}
HTH
Keith
On Aug 18, 11:50 pm, saeb <[EMAIL PROTECTED]> wrote:
> Sorry to ask a stupid question, but following is my basic model
> structure. I want to create a custom manager for a class which has a
> foreignKey to another class. And to call that manager function in list
> display to display all the related properties. Am I doing it right? I
> don't see any associated fields when I execute the following in shell.
> Please help me with this issue, Thanks.
>
> class privateAcctManager(models.Manager):
> def show_acct(self):
> return super(privateAcctManager,
> self).get_query_set().select_related()
>
> class privateAcct(models.Model):
> id = models.ForeignKey(Acct)
> obj = privateAcctManager()
>
> def all_acct(self):
> return self.obj.show_acct()
>
> class Meta:
> db_table= 'private_acct'
>
> class PublicAcct(models.Model):
> id = models.ForeignKey(Acct)
> class Meta:
> db_table= 'public_acct'
>
> class Account(models.Model):
> name = models.TextField()
> balance = models.decimalfield()
>
> class PrivateAcctAdmin(admin.modelAdmin):
> list_display =( id, all_acct.name , all_acct.balance)
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