#11381: select_related over nullable ForeignKey using GeoQuerySet and GeoManager
gives blank object rather than None
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Reporter: bretthoerner | Owner: nobody
Status: new | Milestone: 1.1
Component: GIS | Version: 1.1-beta-1
Keywords: geodjango geo select_related geomanager | Stage: Unreviewed
Has_patch: 0 |
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Sorry for the bad title... I can only explain this with an example,
{{{
from django.contrib.gis.db import models
class Author(models.Model):
name = models.CharField(max_length=100)
class BookManager(models.GeoManager):
def get_query_set(self):
return super(BookManager,
self).get_query_set().select_related('author')
class Book(models.Model):
name = models.CharField(max_length=100)
author = models.ForeignKey(Author, related_name="books", null=True,
blank=True)
objects = BookManager()
}}}
{{{
>>> Book.objects.create(name='Without Author')
<Book: Book object>
>>> b = Book.objects.get(name='Without Author')
>>> b.author
<Author: Author object>
>>> b.author.name
}}}
As you can see, rather than b.author being None, is it an "empty" Author
object. This isn't the case when using non-GeoDjango.
What's even weirder is that this only happens when using the GeoManager.
If you remove the manager and run the select_related yourself, the
following happens,
{{{
>>> Book.objects.select_related('author').get(name='Without
Author').author
}}}
It's None, rather than the "empty" Author from above.
--
Ticket URL: <http://code.djangoproject.com/ticket/11381>
Django <http://code.djangoproject.com/>
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