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# This module collects helper functions and classes that "span" multiple levels
# of MVC. In other words, these functions/classes introduce controlled coupling
# for convenience's sake.
from django.template import loader
from django.http import HttpResponse, Http404
from django.db.models.manager import Manager
def render_to_response(*args, **kwargs):
return HttpResponse(loader.render_to_string(*args, **kwargs))
load_and_render = render_to_response # For backwards compatibility.
def get_object_or_404(klass, *args, **kwargs):
if isinstance(klass, Manager):
manager = klass
klass = manager.model
else:
manager = klass._default_manager
try:
return manager.get(*args, **kwargs)
except klass.DoesNotExist:
raise Http404('No %s matches the given query.' % klass._meta.object_name)
def get_list_or_404(klass, *args, **kwargs):
if isinstance(klass, Manager):
manager = klass
else:
manager = klass._default_manager
obj_list = list(manager.filter(*args, **kwargs))
if not obj_list:
raise Http404('No %s matches the given query.' % manager.model._meta.object_name)
return obj_list
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