EmptyQuerySet is a class within the django.db.models.query module of the Django project.
django-wiki (project documentation, demo, and PyPI page) is a wiki system code library for Django projects that makes it easier to create user-editable content. The project aims to provide necessary core features and then have an easy plugin format for additional features, rather than having every exhaustive feature built into the core system. django-wiki is a rewrite of an earlier now-defunct project named django-simplewiki.
The code for django-wiki is provided as open source under the GNU General Public License 3.0.
django-wiki / src/wiki / managers.py
# managers.py
from django.db import models
from django.db.models import Count
from django.db.models import Q
from django.db.models.query import EmptyQuerySet
from django.db.models.query import QuerySet
from mptt.managers import TreeManager
class ArticleQuerySet(QuerySet):
def can_read(self, user):
if user.has_perm("wiki.moderator"):
return self
if user.is_anonymous:
q = self.filter(other_read=True)
else:
q = self.filter(
Q(other_read=True)
| Q(owner=user)
| (Q(group__user=user) & Q(group_read=True))
).annotate(Count("id"))
return q
def can_write(self, user):
if user.has_perm("wiki.moderator"):
return self
if user.is_anonymous:
q = self.filter(other_write=True)
else:
q = self.filter(
Q(other_write=True)
| Q(owner=user)
| (Q(group__user=user) & Q(group_write=True))
)
return q
def active(self):
return self.filter(current_revision__deleted=False)
class ArticleEmptyQuerySet(EmptyQuerySet):
def can_read(self, user):
return self
def can_write(self, user):
return self
def active(self):
return self
class ArticleFkQuerySetMixin:
def can_read(self, user):
if user.has_perm("wiki.moderate"):
return self
if user.is_anonymous:
q = self.filter(article__other_read=True)
else:
q = self.filter(
Q(article__other_read=True)
| Q(article__owner=user)
| (Q(article__group__user=user) & Q(article__group_read=True))
).annotate(Count("id"))
return q
## ... source file abbreviated to get to EmptyQuerySet examples ...
def can_read(self, user):
return self.get_queryset().can_read(user)
def can_write(self, user):
return self.get_queryset().can_write(user)
class ArticleFkManager(models.Manager):
def get_empty_query_set(self):
return self.get_queryset().none()
def get_queryset(self):
return ArticleFkQuerySet(self.model, using=self._db)
def active(self):
return self.get_queryset().active()
def can_read(self, user):
return self.get_queryset().can_read(user)
def can_write(self, user):
return self.get_queryset().can_write(user)
class URLPathEmptyQuerySet(EmptyQuerySet, ArticleFkEmptyQuerySetMixin):
def select_related_common(self):
return self
def default_order(self):
return self
class URLPathQuerySet(QuerySet, ArticleFkQuerySetMixin):
def select_related_common(self):
return self.select_related(
"parent", "article__current_revision", "article__owner"
)
def default_order(self):
return self.order_by("article__current_revision__title")
class URLPathManager(TreeManager):
def get_empty_query_set(self):
return self.get_queryset().none()
def get_queryset(self):
return URLPathQuerySet(self.model, using=self._db).order_by(
self.tree_id_attr, self.left_attr
Q(article__other_write=True)
| Q(article__owner=user)
| (Q(article__group__user=user) & Q(article__group_write=True))
).annotate(Count("id"))
return q
def active(self):
return self.filter(article__current_revision__deleted=False)
class ArticleFkEmptyQuerySetMixin:
def can_read(self, user):
return self
def can_write(self, user):
return self
def active(self):
return self
class ArticleFkQuerySet(ArticleFkQuerySetMixin, QuerySet):
pass
class ArticleFkEmptyQuerySet(ArticleFkEmptyQuerySetMixin, EmptyQuerySet):
pass
class ArticleManager(models.Manager):
def get_empty_query_set(self):
return self.get_queryset().none()
def get_queryset(self):
return ArticleQuerySet(self.model, using=self._db)
def active(self):
return self.get_queryset().active()
## ... source file continues with no further EmptyQuerySet examples...