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
9422	Incorrect handling of foreign keys by serializers	Dave Hall		"When a foreign key points to a remote object via a non-primary key field, the Python serializer and XML serializer classes can sometimes handle this incorrectly.

This occurs when the primary key of the related object is a OneToOneField, as is the case for model inheritance.  In this case, the serializer will store the __unicode__ version of the primary key, rather than the primary key itself.

As an example:

{{{
class Foo(models.Model):
    pass

class Bar(Foo):
    name = models.CharField(max_length=244)
    slug = models.SlugField(unique=True)
    def __unicode__(self):
        return self.name

class Wibble(models.Model):
    bar = models.ForeignKey(Bar, to_field=""slug"")
}}}

when a Wibble instance is serialized, the value of the 'bar' property will be serialized as the result of calling __unicode__ on the referenced Bar.

This problem can be resolved with the attached patch."	Bug	closed	Core (Serialization)	1.0	Normal	fixed		david@… Dave Hall	Accepted	1	0	1	1	0	0