#26057: Template {% if perms.app_label.permission %} check failing, but {% if
'app_label.permission' in perms %} works
---------------------------------+-------------------------
Reporter: McAnix | Owner: nobody
Type: Bug | Status: new
Component: Template system | Version: 1.8
Severity: Normal | Keywords: permissions
Triage Stage: Unreviewed | Has patch: 0
Easy pickings: 0 | UI/UX: 0
---------------------------------+-------------------------
I'm encountering the issue above for dynamically generated permissions.
I have a Zone model (see below) in a project named "Core" that holds some
content and dynamically builds row-level-like permissions for each entry
using a post_save and post_delete hook to manage it. Please don't judge me
on the usage, it was the simplest solution at the time and the Zone model
content changes infrequently.
The issue I'm facing is when using the dynamic permissions in a template.
I've tested the following in the template:
{{{
{% if 'core.can_view_myzone' in perms %}Check passes{% endif %} <- WORKS
{% perms.core.can_view_myzone %}Check fails{% endif %} <- DOESN'T WORK
}}}
Also in the view:
{{{
print "CAN VIEW: %s" % request.user.has_perm('core.can_view_myzone') <-
WORKS
}}}
Other permissions that are created via the permissions variable in the
Meta class work fine '''BUT''' not if they're in the Zone model. I have
checked migrations and the db tables for
django_content_type/auth_permission and everything exists there and links
correctly.
Middleware as follows:
{{{
MIDDLEWARE_CLASSES = (
'django.middleware.common.CommonMiddleware',
'django.contrib.sessions.middleware.SessionMiddleware',
'django.contrib.auth.middleware.AuthenticationMiddleware',
'django.contrib.messages.middleware.MessageMiddleware',
)
}}}
Template Context Processors:
{{{
TEMPLATE_CONTEXT_PROCESSORS =
('django.contrib.auth.context_processors.auth',
'django.core.context_processors.debug',
'django.core.context_processors.i18n',
'django.core.context_processors.media',
'django.core.context_processors.static',
'django.contrib.messages.context_processors.messages',
'djutils.context_processors.settings_loader') # This just exposes selected
settings to the templates
}}}
{{{
class Zone(models.Model):
"""A holder model for zone information as well as permission slips for
each zone"""
class Meta:
permissions = ()
cdate = models.DateTimeField(auto_now_add=True)
name = models.CharField(max_length=63)
url = models.CharField(max_length=255, verbose_name="Zone URL")
enabled = models.BooleanField()
def __unicode__(self):
return "%s (Enabled: %s)" % (self.name, self.enabled)
def create_zone_permission(sender, instance, created, raw, using,
**kwargs):
"""Creates a new zone permission entry for the new zone"""
content_type = ContentType.objects.get(app_label='core', model='zone')
codename = 'can_view_%s' % (instance.name, )
name='Can View %s' % (instance.name, )
if not Permission.objects.using(using).filter(codename=codename,
content_type=content_type).exists():
logger.info("Creating zone specific permissions for %s" % (codename,
))
Permission.objects.using(using).create(codename=codename, name=name,
content_type=content_type)
def delete_zone_permission(sender, instance, using, **kwargs):
"""Creates a new zone permission entry for the new zone"""
content_type = ContentType.objects.get(app_label='core', model='zone')
codename = 'can_view_%s' % (instance.name, )
if Permission.objects.using(using).filter(codename=codename,
content_type=content_type).exists():
logger.info("Deleting zone specific permissions for %s" % (codename,
))
permission = Permission.objects.using(using).filter(codename=codename,
content_type=content_type)
permission.delete(using=using)
post_save.connect(create_zone_permission, sender=Zone)
post_delete.connect(delete_zone_permission, sender=Zone)
}}}
--
Ticket URL: <https://code.djangoproject.com/ticket/26057>
Django <https://code.djangoproject.com/>
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