getListContentForData function added to lists helper.
It allows to manually set a list of entities which is to be displayed on the view. Previously, the only function was getListContent, but it retrived data on its own by a single query. The new function can be useful whenever it is impossible or very awkward to obtain entities in such a way (for example more sophisticated SQL statements).
Additionally, the getListContent function is reconstructed so that it collects the data first and then calls getListContentForData.
from django.db import models
from django.utils.translation import ugettext_lazy as _
SITE_CACHE = {}
class SiteManager(models.Manager):
def get_current(self):
"""
Returns the current ``Site`` based on the SITE_ID in the
project's settings. The ``Site`` object is cached the first
time it's retrieved from the database.
"""
from django.conf import settings
try:
sid = settings.SITE_ID
except AttributeError:
from django.core.exceptions import ImproperlyConfigured
raise ImproperlyConfigured("You're using the Django \"sites framework\" without having set the SITE_ID setting. Create a site in your database and set the SITE_ID setting to fix this error.")
try:
current_site = SITE_CACHE[sid]
except KeyError:
current_site = self.get(pk=sid)
SITE_CACHE[sid] = current_site
return current_site
def clear_cache(self):
"""Clears the ``Site`` object cache."""
global SITE_CACHE
SITE_CACHE = {}
class Site(models.Model):
domain = models.CharField(_('domain name'), max_length=100)
name = models.CharField(_('display name'), max_length=50)
objects = SiteManager()
class Meta:
db_table = 'django_site'
verbose_name = _('site')
verbose_name_plural = _('sites')
ordering = ('domain',)
def __unicode__(self):
return self.domain
def delete(self):
pk = self.pk
super(Site, self).delete()
try:
del(SITE_CACHE[pk])
except KeyError:
pass
class RequestSite(object):
"""
A class that shares the primary interface of Site (i.e., it has
``domain`` and ``name`` attributes) but gets its data from a Django
HttpRequest object rather than from a database.
The save() and delete() methods raise NotImplementedError.
"""
def __init__(self, request):
self.domain = self.name = request.get_host()
def __unicode__(self):
return self.domain
def save(self, force_insert=False, force_update=False):
raise NotImplementedError('RequestSite cannot be saved.')
def delete(self):
raise NotImplementedError('RequestSite cannot be deleted.')