X-Git-Url: http://git.ithinksw.org/philo.git/blobdiff_plain/786854beaf0a823da2bbbf6696bcd53478e3c059..b263f65878e0709dcceaaed013c766e605b76fb3:/philo/models/nodes.py diff --git a/philo/models/nodes.py b/philo/models/nodes.py index 93f772a..647ba81 100644 --- a/philo/models/nodes.py +++ b/philo/models/nodes.py @@ -2,9 +2,11 @@ from inspect import getargspec import mimetypes from os.path import basename +from django.conf import settings from django.contrib.contenttypes import generic from django.contrib.contenttypes.models import ContentType from django.contrib.sites.models import Site, RequestSite +from django.core.cache import cache from django.core.exceptions import ValidationError from django.core.servers.basehttp import FileWrapper from django.core.urlresolvers import resolve, clear_url_caches, reverse, NoReverseMatch @@ -24,6 +26,7 @@ __all__ = ('Node', 'View', 'MultiView', 'Redirect', 'File') _view_content_type_limiter = ContentTypeSubclassLimiter(None) +CACHE_PHILO_ROOT = getattr(settings, "PHILO_CACHE_PHILO_ROOT", True) class Node(SlugTreeEntity): @@ -31,24 +34,30 @@ class Node(SlugTreeEntity): :class:`Node`\ s are the basic building blocks of a website using Philo. They define the URL hierarchy and connect each URL to a :class:`View` subclass instance which is used to generate an HttpResponse. """ - view_content_type = models.ForeignKey(ContentType, related_name='node_view_set', limit_choices_to=_view_content_type_limiter) - view_object_id = models.PositiveIntegerField() + view_content_type = models.ForeignKey(ContentType, related_name='node_view_set', limit_choices_to=_view_content_type_limiter, blank=True, null=True) + view_object_id = models.PositiveIntegerField(blank=True, null=True) #: :class:`GenericForeignKey` to a non-abstract subclass of :class:`View` view = generic.GenericForeignKey('view_content_type', 'view_object_id') @property def accepts_subpath(self): """A property shortcut for :attr:`self.view.accepts_subpath `""" - if self.view: - return self.view.accepts_subpath + if self.view_object_id and self.view_content_type_id: + return ContentType.objects.get_for_id(self.view_content_type_id).model_class().accepts_subpath return False def handles_subpath(self, subpath): - return self.view.handles_subpath(subpath) + if self.view_object_id and self.view_content_type_id: + return ContentType.objects.get_for_id(self.view_content_type_id).model_class().handles_subpath(subpath) + return False def render_to_response(self, request, extra_context=None): """This is a shortcut method for :meth:`View.render_to_response`""" - return self.view.render_to_response(request, extra_context) + if self.view_object_id and self.view_content_type_id: + view_model = ContentType.objects.get_for_id(self.view_content_type_id).model_class() + self.view = view_model._default_manager.get(pk=self.view_object_id) + return self.view.render_to_response(request, extra_context) + raise Http404 def get_absolute_url(self, request=None, with_domain=False, secure=False): """ @@ -65,6 +74,8 @@ class Node(SlugTreeEntity): Node urls will not contain a trailing slash unless a subpath is provided which ends with a trailing slash. Subpaths are expected to begin with a slash, as if returned by :func:`django.core.urlresolvers.reverse`. + Because this method will be called frequently and will always try to reverse ``philo-root``, the results of that reversal will be cached by default. This can be disabled by setting :setting:`PHILO_CACHE_PHILO_ROOT` to ``False``. + :meth:`construct_url` may raise the following exceptions: - :class:`NoReverseMatch` if "philo-root" is not reversable -- for example, if :mod:`philo.urls` is not included anywhere in your urlpatterns. @@ -79,7 +90,14 @@ class Node(SlugTreeEntity): """ # Try reversing philo-root first, since we can't do anything if that fails. - root_url = reverse('philo-root') + if CACHE_PHILO_ROOT: + key = "CACHE_PHILO_ROOT__" + settings.ROOT_URLCONF + root_url = cache.get(key) + if root_url is None: + root_url = reverse('philo-root') + cache.set(key, root_url) + else: + root_url = reverse('philo-root') try: current_site = Site.objects.get_current() @@ -122,12 +140,13 @@ class View(Entity): #: A generic relation back to nodes. nodes = generic.GenericRelation(Node, content_type_field='view_content_type', object_id_field='view_object_id') - #: Property or attribute which defines whether this :class:`View` can handle subpaths. Default: ``False`` + #: An attribute on the class which defines whether this :class:`View` can handle subpaths. Default: ``False`` accepts_subpath = False - def handles_subpath(self, subpath): + @classmethod + def handles_subpath(cls, subpath): """Returns True if the :class:`View` handles the given subpath, and False otherwise.""" - if not self.accepts_subpath and subpath != "/": + if not cls.accepts_subpath and subpath != "/": return False return True @@ -222,15 +241,6 @@ class MultiView(View): """Returns urlpatterns that point to views (generally methods on the class). :class:`MultiView`\ s can be thought of as "managing" these subpaths.""" raise NotImplementedError("MultiView subclasses must implement urlpatterns.") - def handles_subpath(self, subpath): - if not super(MultiView, self).handles_subpath(subpath): - return False - try: - resolve(subpath, urlconf=self) - except Http404: - return False - return True - def actually_render_to_response(self, request, extra_context=None): """ Resolves the remaining subpath left after finding this :class:`View`'s node using :attr:`self.urlpatterns ` and renders the view function (or method) found with the appropriate args and kwargs. @@ -325,8 +335,17 @@ class TargetURLModel(models.Model): kwargs = dict([(smart_str(k, 'ascii'), v) for k, v in params.items()]) return self.url_or_subpath, args, kwargs - def get_target_url(self): - """Calculates and returns the target url based on the :attr:`target_node`, :attr:`url_or_subpath`, and :attr:`reversing_parameters`.""" + def get_target_url(self, memoize=True): + """Calculates and returns the target url based on the :attr:`target_node`, :attr:`url_or_subpath`, and :attr:`reversing_parameters`. The results will be memoized by default; this can be prevented by passing in ``memoize=False``.""" + if memoize: + memo_args = (self.target_node_id, self.url_or_subpath, self.reversing_parameters_json) + try: + return self._target_url_memo[memo_args] + except AttributeError: + self._target_url_memo = {} + except KeyError: + pass + node = self.target_node if node is not None and node.accepts_subpath and self.url_or_subpath: if self.reversing_parameters is not None: @@ -336,14 +355,19 @@ class TargetURLModel(models.Model): subpath = self.url_or_subpath if subpath[0] != '/': subpath = '/' + subpath - return node.construct_url(subpath) + target_url = node.construct_url(subpath) elif node is not None: - return node.get_absolute_url() + target_url = node.get_absolute_url() else: if self.reversing_parameters is not None: view_name, args, kwargs = self.get_reverse_params() - return reverse(view_name, args=args, kwargs=kwargs) - return self.url_or_subpath + target_url = reverse(view_name, args=args, kwargs=kwargs) + else: + target_url = self.url_or_subpath + + if memoize: + self._target_url_memo[memo_args] = target_url + return target_url target_url = property(get_target_url) class Meta: