#11079: Multi-table inheritance subclassed cannot be proxied
-------------------------------------------------+--------------------------
Reporter: gsong | Owner: nobody
Status: new | Milestone:
Component: Database layer (models, ORM) | Version: SVN
Keywords: model proxy multi-table inheritance | Stage: Unreviewed
Has_patch: 0 |
-------------------------------------------------+--------------------------
Creating a proxy model for a multi-table inherited subclass fails.
{{{
#!python
class Place(models.Model):
name = models.CharField(max_length=50)
class Restaurant(Place):
genre = models.CharField(max_length=50)
class PizzaJoint(Restaurant):
class Meta:
proxy = True
>>> from proxy.models import Restaurant, PizzaJoint
>>> Restaurant.objects.create(name='Greasy Pizza', genre='pizza')
<Restaurant: Restaurant object>
>>> Restaurant.objects.all()
[<Restaurant: Restaurant object>]
>>> PizzaJoint.objects.all()
[]
}}}
Also when accessing `admin/proxy/pizzajoint/`, you get the following stack
trace:
{{{
Template error:
In template
e:\lehrhaus\django\django\contrib\admin\templates\admin\change_list.html,
error at line 78
Caught an exception while rendering: 'NoneType' object has no attribute
'column'
68 : {% endif %}
69 : {% endblock %}
70 :
71 : <form action="" method="post"{% if cl.formset.is_multipart
%} enctype="multipart/form-data"{% endif %}>
72 : {% if cl.formset %}
73 : {{ cl.formset.management_form }}
74 : {% endif %}
75 :
76 : {% block result_list %}
77 : {% if action_form and actions_on_top and
cl.full_result_count %}{% admin_actions %}{% endif %}
78 : {% result_list cl %}
79 : {% if action_form and actions_on_bottom and
cl.full_result_count %}{% admin_actions %}{% endif %}
80 : {% endblock %}
81 : {% block pagination %}{% pagination cl %}{% endblock %}
82 : </form>
83 : </div>
84 : </div>
85 : {% endblock %}
86 :
Traceback:
File "E:\lehrhaus\django\django\core\handlers\base.py" in get_response
92. response = callback(request, *callback_args,
**callback_kwargs)
File "E:\lehrhaus\django\django\contrib\admin\options.py" in wrapper
226. return self.admin_site.admin_view(view)(*args,
**kwargs)
File "E:\lehrhaus\django\django\contrib\admin\sites.py" in inner
184. return view(request, *args, **kwargs)
File "E:\lehrhaus\django\django\contrib\admin\options.py" in
changelist_view
984. ], context,
context_instance=template.RequestContext(request))
File "E:\lehrhaus\django\django\shortcuts\__init__.py" in
render_to_response
20. return HttpResponse(loader.render_to_string(*args, **kwargs),
**httpresponse_kwargs)
File "E:\lehrhaus\django\django\template\loader.py" in render_to_string
108. return t.render(context_instance)
File "E:\lehrhaus\django\django\template\__init__.py" in render
178. return self.nodelist.render(context)
File "E:\lehrhaus\django\django\template\__init__.py" in render
779. bits.append(self.render_node(node, context))
File "E:\lehrhaus\django\django\template\debug.py" in render_node
71. result = node.render(context)
File "E:\lehrhaus\django\django\template\loader_tags.py" in render
97. return compiled_parent.render(context)
File "E:\lehrhaus\django\django\template\__init__.py" in render
178. return self.nodelist.render(context)
File "E:\lehrhaus\django\django\template\__init__.py" in render
779. bits.append(self.render_node(node, context))
File "E:\lehrhaus\django\django\template\debug.py" in render_node
71. result = node.render(context)
File "E:\lehrhaus\django\django\template\loader_tags.py" in render
97. return compiled_parent.render(context)
File "E:\lehrhaus\django\django\template\__init__.py" in render
178. return self.nodelist.render(context)
File "E:\lehrhaus\django\django\template\__init__.py" in render
779. bits.append(self.render_node(node, context))
File "E:\lehrhaus\django\django\template\debug.py" in render_node
71. result = node.render(context)
File "E:\lehrhaus\django\django\template\loader_tags.py" in render
24. result = self.nodelist.render(context)
File "E:\lehrhaus\django\django\template\__init__.py" in render
779. bits.append(self.render_node(node, context))
File "E:\lehrhaus\django\django\template\debug.py" in render_node
71. result = node.render(context)
File "E:\lehrhaus\django\django\template\loader_tags.py" in render
24. result = self.nodelist.render(context)
File "E:\lehrhaus\django\django\template\__init__.py" in render
779. bits.append(self.render_node(node, context))
File "E:\lehrhaus\django\django\template\debug.py" in render_node
81. raise wrapped
Exception Type: TemplateSyntaxError at /admin/proxy/pizzajoint/
Exception Value: Caught an exception while rendering: 'NoneType' object
has no attribute 'column'
Original Traceback (most recent call last):
File "E:\lehrhaus\django\django\template\debug.py", line 71, in
render_node
result = node.render(context)
File "E:\lehrhaus\django\django\template\__init__.py", line 936, in
render
dict = func(*args)
File
"E:\lehrhaus\django\django\contrib\admin\templatetags\admin_list.py", line
251, in result_list
return {'cl': cl,
File
"E:\lehrhaus\django\django\contrib\admin\templatetags\admin_list.py", line
247, in results
for res in cl.result_list:
File "E:\lehrhaus\django\django\db\models\query.py", line 93, in
_result_iter
self._fill_cache()
File "E:\lehrhaus\django\django\db\models\query.py", line 660, in
_fill_cache
self._result_cache.append(self._iter.next())
File "E:\lehrhaus\django\django\db\models\query.py", line 207, in
iterator
for row in self.query.results_iter():
File "E:\lehrhaus\django\django\db\models\sql\query.py", line 287, in
results_iter
for rows in self.execute_sql(MULTI):
File "E:\lehrhaus\django\django\db\models\sql\query.py", line 2336, in
execute_sql
sql, params = self.as_sql()
File "E:\lehrhaus\django\django\db\models\sql\query.py", line 395, in
as_sql
self.pre_sql_setup()
File "E:\lehrhaus\django\django\db\models\sql\query.py", line 587, in
pre_sql_setup
self.setup_inherited_models()
File "E:\lehrhaus\django\django\db\models\sql\query.py", line 1311, in
setup_inherited_models
seen[model] = self.join((root_alias, model._meta.db_table,
AttributeError: 'NoneType' object has no attribute 'column'
}}}
--
Ticket URL: <http://code.djangoproject.com/ticket/11079>
Django <http://code.djangoproject.com/>
The Web framework for perfectionists with deadlines.
--~--~---------~--~----~------------~-------~--~----~
You received this message because you are subscribed to the Google Groups
"Django updates" group.
To post to this group, send email to django-updates@googlegroups.com
To unsubscribe from this group, send email to
django-updates+unsubscr...@googlegroups.com
For more options, visit this group at
http://groups.google.com/group/django-updates?hl=en
-~----------~----~----~----~------~----~------~--~---
