Hi everyone, happy Easter!
I made a simple model with a foreign-keyed orderable - however, when I try
to delete one of the orderable objects I get a "Cannot use None as a query
value"
*Code snippets from models.py/admin.py:*
models.py
class TuitionPage(Page):
class Meta:
verbose_name = _("Tuition page")
verbose_name_plural = _("Tuition pages")
class TuitionContent(Orderable):
tuition = models.ForeignKey(TuitionPage, related_name='tuitioncontent')
title = models.CharField(max_length=2000, blank=True)
content = RichTextField(null=True, blank=True)
def __unicode__(self):
return self.title
admin.py
class TuitionInline(StackedDynamicInlineAdmin):
model = TuitionContent
class TuitionAdmin(PageAdmin):
inlines = (TuitionInline,)
admin.site.register(TuitionPage, TuitionAdmin)
*Image of Tuition Content, about to be deleted:*
<https://lh3.googleusercontent.com/-jYgTbGhFWxA/WPKVB2Brb5I/AAAAAAAAH3g/pE-jw3wedQoG0bU9pRl1yFv4NkIVHsYVQCLcB/s1600/Screen%2BShot%2B2017-04-15%2Bat%2B22.46.38.png>
*Traceback from "ValueError at /admin/vital_theme/tuitionpage/318/ - Cannot
use None as a query value":*
Traceback:
File
"/Users/majora/venv/lib/python2.7/site-packages/django/core/handlers/base.py"
in get_response
132. response = wrapped_callback(request,
*callback_args, **callback_kwargs)
File
"/Users/majora/venv/lib/python2.7/site-packages/django/contrib/admin/options.py"
in wrapper
616. return self.admin_site.admin_view(view)(*args,
**kwargs)
File
"/Users/majora/venv/lib/python2.7/site-packages/django/utils/decorators.py"
in _wrapped_view
110. response = view_func(request, *args, **kwargs)
File
"/Users/majora/venv/lib/python2.7/site-packages/django/views/decorators/cache.py"
in _wrapped_view_func
57. response = view_func(request, *args, **kwargs)
File
"/Users/majora/venv/lib/python2.7/site-packages/django/contrib/admin/sites.py"
in inner
233. return view(request, *args, **kwargs)
File
"/Users/majora/venv/lib/python2.7/site-packages/Mezzanine-4.0.1-py2.7.egg/mezzanine/pages/admin.py"
in change_view
125. return super(PageAdmin, self).change_view(request,
object_id, **kwargs)
File
"/Users/majora/venv/lib/python2.7/site-packages/django/contrib/admin/options.py"
in change_view
1519. return self.changeform_view(request, object_id, form_url,
extra_context)
File
"/Users/majora/venv/lib/python2.7/site-packages/django/utils/decorators.py"
in _wrapper
34. return bound_func(*args, **kwargs)
File
"/Users/majora/venv/lib/python2.7/site-packages/django/utils/decorators.py"
in _wrapped_view
110. response = view_func(request, *args, **kwargs)
File
"/Users/majora/venv/lib/python2.7/site-packages/django/utils/decorators.py"
in bound_func
30. return func.__get__(self, type(self))(*args2,
**kwargs2)
File
"/Users/majora/venv/lib/python2.7/site-packages/django/utils/decorators.py"
in inner
145. return func(*args, **kwargs)
File
"/Users/majora/venv/lib/python2.7/site-packages/django/contrib/admin/options.py"
in changeform_view
1468. self.save_related(request, form, formsets, not add)
File
"/Users/majora/venv/lib/python2.7/site-packages/django/contrib/admin/options.py"
in save_related
1102. self.save_formset(request, form, formset, change=change)
File
"/Users/majora/venv/lib/python2.7/site-packages/django/contrib/admin/options.py"
in save_formset
1090. formset.save()
File
"/Users/majora/venv/lib/python2.7/site-packages/django/forms/models.py" in
save
640. return self.save_existing_objects(commit) +
self.save_new_objects(commit)
File
"/Users/majora/venv/lib/python2.7/site-packages/django/forms/models.py" in
save_existing_objects
754. obj.delete()
File
"/Users/majora/venv/lib/python2.7/site-packages/Mezzanine-4.0.1-py2.7.egg/mezzanine/core/models.py"
in delete
446. after = concrete_model.objects.filter(**lookup)
File
"/Users/majora/venv/lib/python2.7/site-packages/django/db/models/manager.py"
in manager_method
127. return getattr(self.get_queryset(), name)(*args,
**kwargs)
File
"/Users/majora/venv/lib/python2.7/site-packages/django/db/models/query.py"
in filter
679. return self._filter_or_exclude(False, *args, **kwargs)
File
"/Users/majora/venv/lib/python2.7/site-packages/django/db/models/query.py"
in _filter_or_exclude
697. clone.query.add_q(Q(*args, **kwargs))
File
"/Users/majora/venv/lib/python2.7/site-packages/django/db/models/sql/query.py"
in add_q
1309. clause, require_inner = self._add_q(where_part,
self.used_aliases)
File
"/Users/majora/venv/lib/python2.7/site-packages/django/db/models/sql/query.py"
in _add_q
1337. allow_joins=allow_joins, split_subq=split_subq,
File
"/Users/majora/venv/lib/python2.7/site-packages/django/db/models/sql/query.py"
in build_filter
1155. value, lookups, used_joins =
self.prepare_lookup_value(value, lookups, can_reuse, allow_joins)
File
"/Users/majora/venv/lib/python2.7/site-packages/django/db/models/sql/query.py"
in prepare_lookup_value
995. raise ValueError("Cannot use None as a query value")
Exception Type: ValueError at /admin/vital_theme/tuitionpage/318/
Exception Value: Cannot use None as a query value
Any advice would be great appreciated!
Cheers,
Rich
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