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
6805	Get exception when initializing a GenericForeignKey using Model.get_or_create()	niklas@…	nobody	"This call will generate an exception because the content_object is not found as field
{{{
#!python
>>> Property.objects.get_or_create(name=property_name, content_object=self)

This would work fine however (if self is in db as owner of Property):
>>> p = Property(name=property_name, content_object=self)

The last line of the exception is interesting: 
TypeError: Cannot resolve keyword 'content_object' into field. Choices are: anexampleowner, resource, id, name, content_type, object_id
}}}

It seems that, for some reason, here the variable referring to AnExampleOwner class has been named after the class, i.e. 
anexampleowner. Is this by design?

Hee is the code:
{{{
#!python
class Property(models.Model):
    name = models.CharField(max_length=200)#, core=True)
    content_object = generic.GenericForeignKey()        
    content_type = models.ForeignKey(ContentType)
    object_id = models.PositiveIntegerField()

class AnExampleOwner(models.Model, Owner):
    res_props = generic.GenericRelation(Property)
    name = models.CharField(max_length=200)

    def get_or_create_property(self, property_name):
        return Property.objects.get_or_create(name=property_name, content_object=self)

p = mr_dummy.get_or_create_property('description')
 
File ""S:\nc\Projects\Inventive\Ticmate\svn\ticmate\trunk\source\python\ticmate\django\apps\resources\tests.py"", line 16, in ticmate.django.apps.resources.tests
Failed example:
    p = mr_dummy.get_or_create_property('description')
Exception raised:
    Traceback (most recent call last):
      File ""S:\nc\Projects\Inventive\Ticmate\svn\django-trunk\django\test\_doctest.py"", line 1267, in __run
        compileflags, 1) in test.globs
      File ""<doctest ticmate.django.apps.resources.tests[4]>"", line 1, in <module>
        p = mr_dummy.get_or_create_property('description')
      File ""S:\nc\Projects\Inventive\Ticmate\svn\ticmate\trunk\source\python\ticmate\django\apps\resources\models.py"", line 206, in get_or_create_property
        return Property.objects.get_or_create(name=property_name, content_object=self)
      File ""S:\nc\Projects\Inventive\Ticmate\svn\django-trunk\django\db\models\manager.py"", line 72, in get_or_create
        return self.get_query_set().get_or_create(**kwargs)
      File ""S:\nc\Projects\Inventive\Ticmate\svn\django-trunk\django\db\models\query.py"", line 286, in get_or_create
        return self.get(**kwargs), False
      File ""S:\nc\Projects\Inventive\Ticmate\svn\django-trunk\django\db\models\query.py"", line 261, in get
        obj_list = list(clone)
      File ""S:\nc\Projects\Inventive\Ticmate\svn\django-trunk\django\db\models\query.py"", line 114, in __iter__
        return iter(self._get_data())
      File ""S:\nc\Projects\Inventive\Ticmate\svn\django-trunk\django\db\models\query.py"", line 483, in _get_data
        self._result_cache = list(self.iterator())
      File ""S:\nc\Projects\Inventive\Ticmate\svn\django-trunk\django\db\models\query.py"", line 180, in iterator
        select, sql, params = self._get_sql_clause()
      File ""S:\nc\Projects\Inventive\Ticmate\svn\django-trunk\django\db\models\query.py"", line 498, in _get_sql_clause
        joins2, where2, params2 = self._filters.get_sql(opts)
      File ""S:\nc\Projects\Inventive\Ticmate\svn\django-trunk\django\db\models\query.py"", line 720, in get_sql
        joins2, where2, params2 = val.get_sql(opts)
      File ""S:\nc\Projects\Inventive\Ticmate\svn\django-trunk\django\db\models\query.py"", line 771, in get_sql
        return parse_lookup(self.kwargs.items(), opts)
      File ""S:\nc\Projects\Inventive\Ticmate\svn\django-trunk\django\db\models\query.py"", line 926, in parse_lookup
        joins2, where2, params2 = lookup_inner(path, lookup_type, value, opts, opts.db_table, None)
      File ""S:\nc\Projects\Inventive\Ticmate\svn\django-trunk\django\db\models\query.py"", line 1044, in lookup_inner
        raise TypeError, ""Cannot resolve keyword '%s' into field. Choices are: %s"" % (name, "", "".join(choices))
    TypeError: Cannot resolve keyword 'content_object' into field. Choices are: anexampleowner, resource, id, name, content_type, object_id
}}}

Also on http://dpaste.com/39871/"		closed	Database layer (models, ORM)	dev		wontfix	GenericForeignKey		Design decision needed	0	0	0	0	0	0