X-Git-Url: http://git.ithinksw.org/philo.git/blobdiff_plain/a7c05c72e5a1740f6ad7faac157a326cca4efb2a..943e8bc4af0c11b0ace3811199e3b0844c4c3fbc:/philo/models/base.py diff --git a/philo/models/base.py b/philo/models/base.py index 01fdd64..1726d19 100644 --- a/philo/models/base.py +++ b/philo/models/base.py @@ -1,25 +1,31 @@ +from UserDict import DictMixin + from django import forms -from django.db import models from django.contrib.contenttypes.models import ContentType from django.contrib.contenttypes import generic from django.core.exceptions import ObjectDoesNotExist from django.core.validators import RegexValidator +from django.db import models from django.utils import simplejson as json from django.utils.encoding import force_unicode +from mptt.models import MPTTModel, MPTTModelBase, MPTTOptions + from philo.exceptions import AncestorDoesNotExist from philo.models.fields import JSONField -from philo.utils import ContentTypeRegistryLimiter, ContentTypeSubclassLimiter from philo.signals import entity_class_prepared +from philo.utils import ContentTypeRegistryLimiter, ContentTypeSubclassLimiter from philo.validators import json_validator -from UserDict import DictMixin -from mptt.models import MPTTModel, MPTTModelBase, MPTTOptions class Tag(models.Model): + """A simple, generic model for tagging.""" + #: A CharField (max length 255) which contains the name of the tag. name = models.CharField(max_length=255) + #: A CharField (max length 255) which contains the tag's unique slug. slug = models.SlugField(max_length=255, unique=True) def __unicode__(self): + """Returns the value of the :attr:`name` field""" return self.name class Meta: @@ -38,18 +44,12 @@ class Titled(models.Model): abstract = True +#: An instance of :class:`ContentTypeRegistryLimiter` which is used to track the content types which can be related to by :class:`ForeignKeyValue`\ s and :class:`ManyToManyValue`\ s. value_content_type_limiter = ContentTypeRegistryLimiter() -""" -An instance of :class:`ContentTypeRegistryLimiter` which is used to track the content types which can be related to by ForeignKeyValues and ManyToManyValues. - -""" def register_value_model(model): - """ - Registers a model as a valid content type for a :class:`ForeignKeyValue` or :class:`ManyToManyValue` through the :data:`value_content_type_limiter`. - - """ + """Registers a model as a valid content type for a :class:`ForeignKeyValue` or :class:`ManyToManyValue` through the :data:`value_content_type_limiter`.""" value_content_type_limiter.register_class(model) @@ -57,10 +57,7 @@ register_value_model(Tag) def unregister_value_model(model): - """ - Registers a model as a valid content type for a :class:`ForeignKeyValue` or :class:`ManyToManyValue` through the :data:`value_content_type_limiter`. - - """ + """Registers a model as a valid content type for a :class:`ForeignKeyValue` or :class:`ManyToManyValue` through the :data:`value_content_type_limiter`.""" value_content_type_limiter.unregister_class(model) @@ -71,11 +68,10 @@ class AttributeValue(models.Model): AttributeValue subclasses are expected to supply access to a clean version of their value through an attribute called "value". """ + + #: :class:`GenericRelation` to :class:`Attribute` attribute_set = generic.GenericRelation('Attribute', content_type_field='value_content_type', object_id_field='value_object_id') - """ - :class:`GenericRelation` to :class:`Attribute` - """ def set_value(self, value): """Given a ``value``, sets the appropriate fields so that it can be correctly stored in the database.""" raise NotImplementedError @@ -87,6 +83,7 @@ class AttributeValue(models.Model): :returns: A dictionary mapping field names to formfields. """ + raise NotImplementedError def construct_instance(self, **kwargs): @@ -100,11 +97,8 @@ class AttributeValue(models.Model): abstract = True +#: An instance of :class:`ContentTypeSubclassLimiter` which is used to track the content types which are considered valid value models for an :class:`Attribute`. attribute_value_limiter = ContentTypeSubclassLimiter(AttributeValue) -""" -An instance of :class:`ContentTypeSubclassLimiter` which is used to track the content types which are considered valid value models for an :class:`Attribute`. - -""" class JSONValue(AttributeValue): @@ -249,31 +243,21 @@ class ManyToManyValue(AttributeValue): class Attribute(models.Model): - """ - Represents an arbitrary key/value pair on an arbitrary :class:`Model` where the key consists of word characters and the value is a subclass of :class:`AttributeValue`. - - """ + """Represents an arbitrary key/value pair on an arbitrary :class:`Model` where the key consists of word characters and the value is a subclass of :class:`AttributeValue`.""" entity_content_type = models.ForeignKey(ContentType, related_name='attribute_entity_set', verbose_name='Entity type') entity_object_id = models.PositiveIntegerField(verbose_name='Entity ID', db_index=True) - entity = generic.GenericForeignKey('entity_content_type', 'entity_object_id') - """ - :class:`GenericForeignKey` to anything (generally an instance of an Entity subclass). - """ + #: :class:`GenericForeignKey` to anything (generally an instance of an Entity subclass). + entity = generic.GenericForeignKey('entity_content_type', 'entity_object_id') value_content_type = models.ForeignKey(ContentType, related_name='attribute_value_set', limit_choices_to=attribute_value_limiter, verbose_name='Value type', null=True, blank=True) value_object_id = models.PositiveIntegerField(verbose_name='Value ID', null=True, blank=True, db_index=True) - value = generic.GenericForeignKey('value_content_type', 'value_object_id') - """ - :class:`GenericForeignKey` to an instance of a subclass of :class:`AttributeValue` as determined by the :data:`attribute_value_limiter`. - """ + #: :class:`GenericForeignKey` to an instance of a subclass of :class:`AttributeValue` as determined by the :data:`attribute_value_limiter`. + value = generic.GenericForeignKey('value_content_type', 'value_object_id') + #: :class:`CharField` containing a key (up to 255 characters) consisting of alphanumeric characters and underscores. key = models.CharField(max_length=255, validators=[RegexValidator("\w+")], help_text="Must contain one or more alphanumeric characters or underscores.", db_index=True) - """ - :class:`CharField` containing a key (up to 255 characters) consisting of alphanumeric characters and underscores. - - """ def __unicode__(self): return u'"%s": %s' % (self.key, self.value) @@ -346,7 +330,9 @@ class Entity(models.Model): u'eggs' >>> entity.attributes['spam'] u'eggs' + """ + return QuerySetMapper(self.attribute_set.all()) class Meta: @@ -358,7 +344,7 @@ class TreeManager(models.Manager): def get_with_path(self, path, root=None, absolute_result=True, pathsep='/', field='slug'): """ - If ``absolute_result`` is ``True``, returns the object at ``path`` (starting at ``root``) or raises a :exception:`DoesNotExist` exception. Otherwise, returns a tuple containing the deepest object found along ``path`` (or ``root`` if no deeper object is found) and the remainder of the path after that object as a string (or None if there is no remaining path). + If ``absolute_result`` is ``True``, returns the object at ``path`` (starting at ``root``) or raises an :class:`~django.core.exceptions.ObjectDoesNotExist` exception. Otherwise, returns a tuple containing the deepest object found along ``path`` (or ``root`` if no deeper object is found) and the remainder of the path after that object as a string (or None if there is no remaining path). .. note:: If you are looking for something with an exact path, it is faster to use absolute_result=True, unless the path depth is over ~40, in which case the high cost of the absolute query may make a binary search (i.e. non-absolute) faster. @@ -369,9 +355,11 @@ class TreeManager(models.Manager): :param absolute_result: Whether to return an absolute result or do a binary search :param pathsep: The path separator used in ``path`` :param field: The field on the model which should be queried for ``path`` segment matching. - :returns: An instance if absolute_result is True or (instance, remaining_path) otherwise. + :returns: An instance if ``absolute_result`` is ``True`` or an (instance, remaining_path) tuple otherwise. + :raises django.core.exceptions.ObjectDoesNotExist: if no object can be found matching the input parameters. """ + segments = path.split(pathsep) # Clean out blank segments. Handles multiple consecutive pathseps. @@ -477,6 +465,7 @@ class TreeModel(MPTTModel): :returns: A string representation of an object's path. """ + if root == self: return '' @@ -508,10 +497,8 @@ class TreeEntityBase(MPTTModelBase, EntityBase): class TreeEntity(Entity, TreeModel): - """ - An abstract subclass of Entity which represents a tree relationship. + """An abstract subclass of Entity which represents a tree relationship.""" - """ __metaclass__ = TreeEntityBase @property @@ -530,6 +517,7 @@ class TreeEntity(Entity, TreeModel): u'eggs' """ + if self.parent: return QuerySetMapper(self.attribute_set.all(), passthrough=self.parent.attributes) return super(TreeEntity, self).attributes