X-Git-Url: http://git.ithinksw.org/philo.git/blobdiff_plain/d19e216035b14d8f60b24dda0c0670e6997f16ce..957c1a654f871388f37195315b6797bfbcda6a5e:/philo/models/nodes.py diff --git a/philo/models/nodes.py b/philo/models/nodes.py index 99be196..0765f8c 100644 --- a/philo/models/nodes.py +++ b/philo/models/nodes.py @@ -1,20 +1,21 @@ -from django.db import models -from django.contrib.contenttypes.models import ContentType +from inspect import getargspec + from django.contrib.contenttypes import generic +from django.contrib.contenttypes.models import ContentType from django.contrib.sites.models import Site, RequestSite -from django.http import HttpResponse, HttpResponseServerError, HttpResponseRedirect, Http404 from django.core.exceptions import ValidationError from django.core.servers.basehttp import FileWrapper from django.core.urlresolvers import resolve, clear_url_caches, reverse, NoReverseMatch +from django.db import models +from django.http import HttpResponse, HttpResponseServerError, HttpResponseRedirect, Http404 from django.template import add_to_builtins as register_templatetags from django.utils.encoding import smart_str -from inspect import getargspec -from philo.exceptions import MIDDLEWARE_NOT_CONFIGURED + +from philo.exceptions import MIDDLEWARE_NOT_CONFIGURED, ViewCanNotProvideSubpath, ViewDoesNotProvideSubpaths from philo.models.base import TreeEntity, Entity, QuerySetMapper, register_value_model from philo.models.fields import JSONField from philo.utils import ContentTypeSubclassLimiter from philo.validators import RedirectValidator -from philo.exceptions import ViewCanNotProvideSubpath, ViewDoesNotProvideSubpaths, AncestorDoesNotExist from philo.signals import view_about_to_render, view_finished_rendering @@ -22,12 +23,18 @@ _view_content_type_limiter = ContentTypeSubclassLimiter(None) class Node(TreeEntity): + """ + :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() + #: :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 return False @@ -36,21 +43,36 @@ class Node(TreeEntity): return self.view.handles_subpath(subpath) 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) def get_absolute_url(self, request=None, with_domain=False, secure=False): + """ + This is essentially a shortcut for calling :meth:`construct_url` without a subpath. + + :returns: The absolute url of the node on the current site. + + """ return self.construct_url(request=request, with_domain=with_domain, secure=secure) def construct_url(self, subpath="/", request=None, with_domain=False, secure=False): """ - This method will construct a URL based on the Node's location. - If a request is passed in, that will be used as a backup in case - the Site lookup fails. The Site lookup takes precedence because - it's what's used to find the root node. This will raise: - - NoReverseMatch if philo-root is not reverseable - - Site.DoesNotExist if a domain is requested but not buildable. - - AncestorDoesNotExist if the root node of the site isn't an - ancestor of this instance. + This method will do its best to construct a URL based on the Node's location. If with_domain is True, that URL will include a domain and a protocol; if secure is True as well, the protocol will be https. The request will be used to construct a domain in cases where a call to :meth:`Site.objects.get_current` fails. + + 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`. + + :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. + - :class:`Site.DoesNotExist ` if with_domain is True but no :class:`Site` or :class:`RequestSite` can be built. + - :class:`~philo.exceptions.AncestorDoesNotExist` if the root node of the site isn't an ancestor of the node constructing the URL. + + :param string subpath: The subpath to be constructed beyond beyond the node's URL. + :param request: :class:`HttpRequest` instance. Will be used to construct a :class:`RequestSite` if :meth:`Site.objects.get_current` fails. + :param with_domain: Whether the constructed URL should include a domain name and protocol. + :param secure: Whether the protocol, if included, should be http:// or https://. + :returns: A constructed url for accessing the given subpath of the current node instance. + """ # Try reversing philo-root first, since we can't do anything if that fails. root_url = reverse('philo-root') @@ -89,18 +111,41 @@ models.ForeignKey(Node, related_name='sites', null=True, blank=True).contribute_ class View(Entity): + """ + :class:`View` is an abstract model that represents an item which can be "rendered", generally in response to an :class:`HttpRequest`. + + """ + #: 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`` accepts_subpath = False def handles_subpath(self, subpath): + """Returns True if the the :class:`View` handles the given subpath, and False otherwise.""" if not self.accepts_subpath and subpath != "/": return False return True def reverse(self, view_name=None, args=None, kwargs=None, node=None, obj=None): - """Shortcut method to handle the common pattern of getting the - absolute url for a view's subpaths.""" + """ + If :attr:`accepts_subpath` is True, try to reverse a URL using the given parameters using ``self`` as the urlconf. + + If ``obj`` is provided, :meth:`get_reverse_params` will be called and the results will be combined with any ``view_name``, ``args``, and ``kwargs`` that may have been passed in. + + This method will raise the following exceptions: + + - :class:`~philo.exceptions.ViewDoesNotProvideSubpaths` if :attr:`accepts_subpath` is False. + - :class:`~philo.exceptions.ViewCanNotProvideSubpath` if a reversal is not possible. + + :param view_name: The name of the view to be reversed. + :param args: Extra args for reversing the view. + :param kwargs: A dictionary of arguments for reversing the view. + :param node: The node whose subpath this is. + :param obj: An object to be passed to :meth:`get_reverse_params` to generate a view_name, args, and kwargs for reversal. + :returns: A subpath beyond the node that reverses the view, or an absolute url that reverses the view if a node was passed in. + + """ if not self.accepts_subpath: raise ViewDoesNotProvideSubpaths @@ -123,7 +168,10 @@ class View(Entity): return subpath def get_reverse_params(self, obj): - """This method should return a view_name, args, kwargs tuple suitable for reversing a url for the given obj using self as the urlconf.""" + """ + This method is not implemented on the base class. It should return a (``view_name``, ``args``, ``kwargs``) tuple suitable for reversing a url for the given ``obj`` using ``self`` as the urlconf. If a reversal will not be possible, this method should raise :class:`~philo.exceptions.ViewCanNotProvideSubpath`. + + """ raise NotImplementedError("View subclasses must implement get_reverse_params to support subpaths.") def attributes_with_node(self, node):