id	summary	reporter	owner	description	type	status	component	version	severity	resolution	keywords	cc	stage	has_patch	needs_docs	needs_tests	needs_better_patch	easy	ui_ux
11381	select_related over nullable ForeignKey using GeoQuerySet and GeoManager gives blank object rather than None	Brett Hoerner	nobody	"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."		closed	GIS	1.1-beta		fixed	geodjango geo select_related geomanager	dgouldin@…	Accepted	1	0	1	0	0	0