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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.
"""
import warnings
from django.core import urlresolvers
from django.db.models.base import ModelBase
from django.db.models.manager import Manager
from django.db.models.query import QuerySet
from django.http import (
Http404, HttpResponse, HttpResponsePermanentRedirect, HttpResponseRedirect,
)
from django.template import RequestContext, loader
from django.template.context import _current_app_undefined
from django.template.engine import (
_context_instance_undefined, _dictionary_undefined, _dirs_undefined,
)
from django.utils import six
from django.utils.deprecation import RemovedInDjango110Warning
from django.utils.encoding import force_text
from django.utils.functional import Promise
def render_to_response(template_name, context=None,
context_instance=_context_instance_undefined,
content_type=None, status=None, dirs=_dirs_undefined,
dictionary=_dictionary_undefined, using=None):
"""
Returns a HttpResponse whose content is filled with the result of calling
django.template.loader.render_to_string() with the passed arguments.
"""
if (context_instance is _context_instance_undefined
and dirs is _dirs_undefined
and dictionary is _dictionary_undefined):
# No deprecated arguments were passed - use the new code path
content = loader.render_to_string(template_name, context, using=using)
else:
# Some deprecated arguments were passed - use the legacy code path
content = loader.render_to_string(
template_name, context, context_instance, dirs, dictionary,
using=using)
return HttpResponse(content, content_type, status)
def render(request, template_name, context=None,
context_instance=_context_instance_undefined,
content_type=None, status=None, current_app=_current_app_undefined,
dirs=_dirs_undefined, dictionary=_dictionary_undefined,
using=None):
"""
Returns a HttpResponse whose content is filled with the result of calling
django.template.loader.render_to_string() with the passed arguments.
Uses a RequestContext by default.
"""
if (context_instance is _context_instance_undefined
and current_app is _current_app_undefined
and dirs is _dirs_undefined
and dictionary is _dictionary_undefined):
# No deprecated arguments were passed - use the new code path
# In Django 1.10, request should become a positional argument.
content = loader.render_to_string(
template_name, context, request=request, using=using)
else:
# Some deprecated arguments were passed - use the legacy code path
if context_instance is not _context_instance_undefined:
if current_app is not _current_app_undefined:
raise ValueError('If you provide a context_instance you must '
'set its current_app before calling render()')
else:
context_instance = RequestContext(request)
if current_app is not _current_app_undefined:
warnings.warn(
"The current_app argument of render is deprecated. "
"Set the current_app attribute of request instead.",
RemovedInDjango110Warning, stacklevel=2)
request.current_app = current_app
# Directly set the private attribute to avoid triggering the
# warning in RequestContext.__init__.
context_instance._current_app = current_app
content = loader.render_to_string(
template_name, context, context_instance, dirs, dictionary,
using=using)
return HttpResponse(content, content_type, status)
def redirect(to, *args, **kwargs):
"""
Returns an HttpResponseRedirect to the appropriate URL for the arguments
passed.
The arguments could be:
* A model: the model's `get_absolute_url()` function will be called.
* A view name, possibly with arguments: `urlresolvers.reverse()` will
be used to reverse-resolve the name.
* A URL, which will be used as-is for the redirect location.
By default issues a temporary redirect; pass permanent=True to issue a
permanent redirect
"""
if kwargs.pop('permanent', False):
redirect_class = HttpResponsePermanentRedirect
else:
redirect_class = HttpResponseRedirect
return redirect_class(resolve_url(to, *args, **kwargs))
def _get_queryset(klass):
"""
Returns a QuerySet from a Model, Manager, or QuerySet. Created to make
get_object_or_404 and get_list_or_404 more DRY.
Raises a ValueError if klass is not a Model, Manager, or QuerySet.
"""
if isinstance(klass, QuerySet):
return klass
elif isinstance(klass, Manager):
manager = klass
elif isinstance(klass, ModelBase):
manager = klass._default_manager
else:
if isinstance(klass, type):
klass__name = klass.__name__
else:
klass__name = klass.__class__.__name__
raise ValueError("Object is of type '%s', but must be a Django Model, "
"Manager, or QuerySet" % klass__name)
return manager.all()
def get_object_or_404(klass, *args, **kwargs):
"""
Uses get() to return an object, or raises a Http404 exception if the object
does not exist.
klass may be a Model, Manager, or QuerySet object. All other passed
arguments and keyword arguments are used in the get() query.
Note: Like with get(), an MultipleObjectsReturned will be raised if more than one
object is found.
"""
queryset = _get_queryset(klass)
try:
return queryset.get(*args, **kwargs)
except queryset.model.DoesNotExist:
raise Http404('No %s matches the given query.' % queryset.model._meta.object_name)
def get_list_or_404(klass, *args, **kwargs):
"""
Uses filter() to return a list of objects, or raise a Http404 exception if
the list is empty.
klass may be a Model, Manager, or QuerySet object. All other passed
arguments and keyword arguments are used in the filter() query.
"""
queryset = _get_queryset(klass)
obj_list = list(queryset.filter(*args, **kwargs))
if not obj_list:
raise Http404('No %s matches the given query.' % queryset.model._meta.object_name)
return obj_list
def resolve_url(to, *args, **kwargs):
"""
Return a URL appropriate for the arguments passed.
The arguments could be:
* A model: the model's `get_absolute_url()` function will be called.
* A view name, possibly with arguments: `urlresolvers.reverse()` will
be used to reverse-resolve the name.
* A URL, which will be returned as-is.
"""
# If it's a model, use get_absolute_url()
if hasattr(to, 'get_absolute_url'):
return to.get_absolute_url()
if isinstance(to, Promise):
# Expand the lazy instance, as it can cause issues when it is passed
# further to some Python functions like urlparse.
to = force_text(to)
if isinstance(to, six.string_types):
# Handle relative URLs
if any(to.startswith(path) for path in ('./', '../')):
return to
# Next try a reverse URL resolution.
try:
return urlresolvers.reverse(to, args=args, kwargs=kwargs)
except urlresolvers.NoReverseMatch:
# If this is a callable, re-raise.
if callable(to):
raise
# If this doesn't "feel" like a URL, re-raise.
if '/' not in to and '.' not in to:
raise
# Finally, fall back and assume it's a URL
return to
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