Merged the contribution information from the ithinksw.org philo wiki into the documen...

[philo.git] / philo / models / nodes.py

diff --git a/philo/models/nodes.py b/philo/models/nodes.py
index 2d4639f..647ba81 100644 (file)
--- a/philo/models/nodes.py
+++ b/philo/models/nodes.py
@@ -1,50 +1,63 @@
 from inspect import getargspec
 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.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
 from django.db import models
 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 philo.exceptions import MIDDLEWARE_NOT_CONFIGURED, ViewCanNotProvideSubpath, ViewDoesNotProvideSubpaths
 from django.utils.encoding import smart_str
 
 from philo.exceptions import MIDDLEWARE_NOT_CONFIGURED, ViewCanNotProvideSubpath, ViewDoesNotProvideSubpaths

-from philo.models.base import TreeEntity, Entity, QuerySetMapper, register_value_model
+from philo.models.base import SlugTreeEntity, Entity, register_value_model

 from philo.models.fields import JSONField
 from philo.utils import ContentTypeSubclassLimiter
 from philo.models.fields import JSONField
 from philo.utils import ContentTypeSubclassLimiter

-from philo.validators import RedirectValidator
+from philo.utils.entities import LazyPassthroughAttributeMapper

 from philo.signals import view_about_to_render, view_finished_rendering
 
 
 from philo.signals import view_about_to_render, view_finished_rendering
 
 

+__all__ = ('Node', 'View', 'MultiView', 'Redirect', 'File')
+
+

 _view_content_type_limiter = ContentTypeSubclassLimiter(None)
 _view_content_type_limiter = ContentTypeSubclassLimiter(None)

+CACHE_PHILO_ROOT = getattr(settings, "PHILO_CACHE_PHILO_ROOT", True)

 
 
 
 

-class Node(TreeEntity):
+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.
        
        """
        """
        :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 <View.accepts_subpath>`"""
        #: :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 <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 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`"""
        
        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):
                """
        
        def get_absolute_url(self, request=None, with_domain=False, secure=False):
                """


@@ -61,6 +74,8 @@ class Node(TreeEntity):
                
                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`.
                
                
                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.
                :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.


@@ -75,7 +90,14 @@ class Node(TreeEntity):
                
                """
                # Try reversing philo-root first, since we can't do anything if that fails.
                
                """
                # 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()
                
                try:
                        current_site = Site.objects.get_current()


@@ -102,7 +124,7 @@ class Node(TreeEntity):
                
                return '%s%s%s%s' % (domain, root_url, path, subpath)
        
                
                return '%s%s%s%s' % (domain, root_url, path, subpath)
        

-       class Meta:
+       class Meta(SlugTreeEntity.Meta):

                app_label = 'philo'
 
 
                app_label = 'philo'
 
 


@@ -118,12 +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')
        
        #: 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
        
        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."""
                """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
        
                        return False
                return True
        


@@ -133,17 +156,14 @@ class View(Entity):
                
                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.
                
                
                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.
                :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.

+               :except philo.exceptions.ViewDoesNotProvideSubpaths: if :attr:`accepts_subpath` is False
+               :except philo.exceptions.ViewCanNotProvideSubpath: if a reversal is not possible.

                
                """
                if not self.accepts_subpath:
                
                """
                if not self.accepts_subpath:


@@ -174,12 +194,12 @@ class View(Entity):
                """
                raise NotImplementedError("View subclasses must implement get_reverse_params to support subpaths.")
        
                """
                raise NotImplementedError("View subclasses must implement get_reverse_params to support subpaths.")
        

-       def attributes_with_node(self, node):
+       def attributes_with_node(self, node, mapper=LazyPassthroughAttributeMapper):

                """
                """

-               Returns a :class:`~philo.models.base.QuerySetMapper` using the :class:`Node`'s attributes as a passthrough.
+               Returns a :class:`LazyPassthroughAttributeMapper` which can be used to directly retrieve the values of :class:`Attribute`\ s related to the :class:`View`, falling back on the :class:`Attribute`\ s of the passed-in :class:`Node` and its ancestors.

                
                """
                
                """

-               return QuerySetMapper(self.attribute_set, passthrough=node.attributes)
+               return mapper((self, node))

        
        def render_to_response(self, request, extra_context=None):
                """
        
        def render_to_response(self, request, extra_context=None):
                """


@@ -221,22 +241,13 @@ 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.")
        
                """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 <urlpatterns>` and renders the view function (or method) found with the appropriate args and kwargs.
                
                """
                clear_url_caches()
        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 <urlpatterns>` and renders the view function (or method) found with the appropriate args and kwargs.
                
                """
                clear_url_caches()

-               subpath = request.node.subpath
+               subpath = request.node._subpath

                view, args, kwargs = resolve(subpath, urlconf=self)
                view_args = getargspec(view)
                if extra_context is not None and ('extra_context' in view_args[0] or view_args[2] is not None):
                view, args, kwargs = resolve(subpath, urlconf=self)
                view_args = getargspec(view)
                if extra_context is not None and ('extra_context' in view_args[0] or view_args[2] is not None):


@@ -292,10 +303,10 @@ class MultiView(View):
 
 class TargetURLModel(models.Model):
        """An abstract parent class for models which deal in targeting a url."""
 
 class TargetURLModel(models.Model):
        """An abstract parent class for models which deal in targeting a url."""

-       #: An optional :class:`ForeignKey` to a :class:`Node`. If provided, that node will be used as the basis for the redirect.
+       #: An optional :class:`ForeignKey` to a :class:`.Node`. If provided, that node will be used as the basis for the redirect.

        target_node = models.ForeignKey(Node, blank=True, null=True, related_name="%(app_label)s_%(class)s_related")
        target_node = models.ForeignKey(Node, blank=True, null=True, related_name="%(app_label)s_%(class)s_related")

-       #: A :class:`CharField` which may contain an absolute or relative URL. This will be validated with :class:`philo.validators.RedirectValidator`.
-       url_or_subpath = models.CharField(max_length=200, validators=[RedirectValidator()], blank=True, help_text="Point to this url or, if a node is defined and accepts subpaths, this subpath of the node.")
+       #: A :class:`CharField` which may contain an absolute or relative URL, or the name of a node's subpath.
+       url_or_subpath = models.CharField(max_length=200, blank=True, help_text="Point to this url or, if a node is defined and accepts subpaths, this subpath of the node.")

        #: A :class:`~philo.models.fields.JSONField` instance. If the value of :attr:`reversing_parameters` is not None, the :attr:`url_or_subpath` will be treated as the name of a view to be reversed. The value of :attr:`reversing_parameters` will be passed into the reversal as args if it is a list or as kwargs if it is a dictionary. Otherwise it will be ignored.
        reversing_parameters = JSONField(blank=True, help_text="If reversing parameters are defined, url_or_subpath will instead be interpreted as the view name to be reversed.")
        
        #: A :class:`~philo.models.fields.JSONField` instance. If the value of :attr:`reversing_parameters` is not None, the :attr:`url_or_subpath` will be treated as the name of a view to be reversed. The value of :attr:`reversing_parameters` will be passed into the reversal as args if it is a list or as kwargs if it is a dictionary. Otherwise it will be ignored.
        reversing_parameters = JSONField(blank=True, help_text="If reversing parameters are defined, url_or_subpath will instead be interpreted as the view name to be reversed.")
        


@@ -324,8 +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
        
                        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:
                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:


@@ -335,14 +355,19 @@ class TargetURLModel(models.Model):
                                subpath = self.url_or_subpath
                                if subpath[0] != '/':
                                        subpath = '/' + subpath
                                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:
                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()
                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:
        target_url = property(get_target_url)
        
        class Meta:


@@ -371,24 +396,32 @@ class Redirect(TargetURLModel, View):
 
 class File(View):
        """Stores an arbitrary file."""
 
 class File(View):
        """Stores an arbitrary file."""

-       #: Defines the mimetype of the uploaded file. This will not be validated.
-       mimetype = models.CharField(max_length=255)
+       #: The name of the uploaded file. This is meant for finding the file again later, not for display.
+       name = models.CharField(max_length=255)
+       #: Defines the mimetype of the uploaded file. This will not be validated. If no mimetype is provided, it will be automatically generated based on the filename.
+       mimetype = models.CharField(max_length=255, blank=True)

        #: Contains the uploaded file. Files are uploaded to ``philo/files/%Y/%m/%d``.
        file = models.FileField(upload_to='philo/files/%Y/%m/%d')
        
        #: Contains the uploaded file. Files are uploaded to ``philo/files/%Y/%m/%d``.
        file = models.FileField(upload_to='philo/files/%Y/%m/%d')
        

+       def clean(self):
+               if not self.mimetype:
+                       self.mimetype = mimetypes.guess_type(self.file.name, strict=False)[0]
+                       if self.mimetype is None:
+                               raise ValidationError("Unknown file type.")
+       

        def actually_render_to_response(self, request, extra_context=None):
                wrapper = FileWrapper(self.file)
                response = HttpResponse(wrapper, content_type=self.mimetype)
                response['Content-Length'] = self.file.size
        def actually_render_to_response(self, request, extra_context=None):
                wrapper = FileWrapper(self.file)
                response = HttpResponse(wrapper, content_type=self.mimetype)
                response['Content-Length'] = self.file.size

+               response['Content-Disposition'] = "inline; filename=%s" % basename(self.file.name)

                return response
        
        class Meta:
                app_label = 'philo'
        
        def __unicode__(self):
                return response
        
        class Meta:
                app_label = 'philo'
        
        def __unicode__(self):

-               """Returns the path of the uploaded file."""
-               return self.file.name
+               """Returns the value of :attr:`File.name`."""
+               return self.name

 
 
 
 

-register_templatetags('philo.templatetags.nodes')

 register_value_model(Node)
\ No newline at end of file
 register_value_model(Node)
\ No newline at end of file