X-Git-Url: http://git.ithinksw.org/philo.git/blobdiff_plain/7bce2277e95107a35ea6bd47d692bc0f7ea71819..19e0d1e6a2bb46d46b988fbad188d8dd4288bf5e:/models/base.py diff --git a/models/base.py b/models/base.py index 81e557f..5d09f37 100644 --- a/models/base.py +++ b/models/base.py @@ -1,16 +1,20 @@ +from django import forms from django.db import models from django.contrib.contenttypes.models import ContentType from django.contrib.contenttypes import generic from django.utils import simplejson as json from django.core.exceptions import ObjectDoesNotExist -from philo.utils import ContentTypeRegistryLimiter +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.validators import json_validator from UserDict import DictMixin class Tag(models.Model): - name = models.CharField(max_length=250) - slug = models.SlugField(unique=True) + name = models.CharField(max_length=255) + slug = models.SlugField(max_length=255, unique=True) def __unicode__(self): return self.name @@ -30,57 +34,138 @@ class Titled(models.Model): abstract = True -class Attribute(models.Model): - entity_content_type = models.ForeignKey(ContentType, verbose_name='Entity type') - entity_object_id = models.PositiveIntegerField(verbose_name='Entity ID') - entity = generic.GenericForeignKey('entity_content_type', 'entity_object_id') - key = models.CharField(max_length=255) - json_value = models.TextField(verbose_name='Value (JSON)', help_text='This value must be valid JSON.') - - def get_value(self): - return json.loads(self.json_value) - - def set_value(self, value): - self.json_value = json.dumps(value) - - def delete_value(self): - self.json_value = json.dumps(None) +value_content_type_limiter = ContentTypeRegistryLimiter() + + +def register_value_model(model): + value_content_type_limiter.register_class(model) + + +def unregister_value_model(model): + value_content_type_limiter.unregister_class(model) + + +class AttributeValue(models.Model): + attribute = generic.GenericRelation('Attribute', content_type_field='value_content_type', object_id_field='value_object_id') + def apply_data(self, data): + raise NotImplementedError - value = property(get_value, set_value, delete_value) + def value_formfield(self, **kwargs): + raise NotImplementedError def __unicode__(self): - return u'"%s": %s' % (self.key, self.value) + return unicode(self.value) class Meta: - app_label = 'philo' + abstract = True -value_content_type_limiter = ContentTypeRegistryLimiter() +attribute_value_limiter = ContentTypeSubclassLimiter(AttributeValue) -def register_value_model(model): - value_content_type_limiter.register_class(model) +class JSONValue(AttributeValue): + value = JSONField() #verbose_name='Value (JSON)', help_text='This value must be valid JSON.') + + def __unicode__(self): + return self.value_json + + def value_formfield(self, **kwargs): + kwargs['initial'] = self.value_json + return self._meta.get_field('value').formfield(**kwargs) + + def apply_data(self, cleaned_data): + self.value = cleaned_data.get('value', None) + + class Meta: + app_label = 'philo' -def unregister_value_model(model): - value_content_type_limiter.unregister_class(model) +class ForeignKeyValue(AttributeValue): + content_type = models.ForeignKey(ContentType, related_name='foreign_key_value_set', limit_choices_to=value_content_type_limiter, verbose_name='Value type', null=True, blank=True) + object_id = models.PositiveIntegerField(verbose_name='Value ID', null=True, blank=True) + value = generic.GenericForeignKey() + + def value_formfield(self, form_class=forms.ModelChoiceField, **kwargs): + if self.content_type is None: + return None + kwargs.update({'initial': self.object_id, 'required': False}) + return form_class(self.content_type.model_class()._default_manager.all(), **kwargs) + + def apply_data(self, cleaned_data): + if 'value' in cleaned_data and cleaned_data['value'] is not None: + self.value = cleaned_data['value'] + else: + self.content_type = cleaned_data.get('content_type', None) + # If there is no value set in the cleaned data, clear the stored value. + self.object_id = None + + class Meta: + app_label = 'philo' +class ManyToManyValue(AttributeValue): + # TODO: Change object_ids to object_pks. + content_type = models.ForeignKey(ContentType, related_name='many_to_many_value_set', limit_choices_to=value_content_type_limiter, verbose_name='Value type', null=True, blank=True) + object_ids = models.CommaSeparatedIntegerField(max_length=300, verbose_name='Value IDs', null=True, blank=True) + + def get_object_id_list(self): + if not self.object_ids: + return [] + else: + return self.object_ids.split(',') + + def get_value(self): + if self.content_type is None: + return None + + return self.content_type.model_class()._default_manager.filter(id__in=self.get_object_id_list()) + + def set_value(self, value): + if value is None: + self.object_ids = "" + return + if not isinstance(value, models.query.QuerySet): + raise TypeError("Value must be a QuerySet.") + self.content_type = ContentType.objects.get_for_model(value.model) + self.object_ids = ','.join([`value` for value in value.values_list('id', flat=True)]) + + value = property(get_value, set_value) + + def value_formfield(self, form_class=forms.ModelMultipleChoiceField, **kwargs): + if self.content_type is None: + return None + kwargs.update({'initial': self.get_object_id_list(), 'required': False}) + return form_class(self.content_type.model_class()._default_manager.all(), **kwargs) + + def apply_data(self, cleaned_data): + if 'value' in cleaned_data and cleaned_data['value'] is not None: + self.value = cleaned_data['value'] + else: + self.content_type = cleaned_data.get('content_type', None) + # If there is no value set in the cleaned data, clear the stored value. + self.object_ids = "" + + class Meta: + app_label = 'philo' -class Relationship(models.Model): - entity_content_type = models.ForeignKey(ContentType, related_name='relationship_entity_set', verbose_name='Entity type') + +class Attribute(models.Model): + entity_content_type = models.ForeignKey(ContentType, related_name='attribute_entity_set', verbose_name='Entity type') entity_object_id = models.PositiveIntegerField(verbose_name='Entity ID') entity = generic.GenericForeignKey('entity_content_type', 'entity_object_id') - key = models.CharField(max_length=255) - value_content_type = models.ForeignKey(ContentType, related_name='relationship_value_set', limit_choices_to=value_content_type_limiter, verbose_name='Value type', null=True, blank=True) + + 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) value = generic.GenericForeignKey('value_content_type', 'value_object_id') + key = models.CharField(max_length=255) + def __unicode__(self): return u'"%s": %s' % (self.key, self.value) class Meta: app_label = 'philo' + unique_together = (('key', 'entity_content_type', 'entity_object_id'), ('value_content_type', 'value_object_id')) class QuerySetMapper(object, DictMixin): @@ -90,11 +175,15 @@ class QuerySetMapper(object, DictMixin): def __getitem__(self, key): try: - return self.queryset.get(key__exact=key).value + value = self.queryset.get(key__exact=key).value except ObjectDoesNotExist: if self.passthrough is not None: return self.passthrough.__getitem__(key) raise KeyError + else: + if value is not None: + return value.value + return value def keys(self): keys = set(self.queryset.values_list('key', flat=True).distinct()) @@ -128,16 +217,11 @@ class Entity(models.Model): __metaclass__ = EntityBase attribute_set = generic.GenericRelation(Attribute, content_type_field='entity_content_type', object_id_field='entity_object_id') - relationship_set = generic.GenericRelation(Relationship, content_type_field='entity_content_type', object_id_field='entity_object_id') @property def attributes(self): return QuerySetMapper(self.attribute_set) - @property - def relationships(self): - return QuerySetMapper(self.relationship_set) - @property def _added_attribute_registry(self): if not hasattr(self, '_real_added_attribute_registry'): @@ -150,18 +234,6 @@ class Entity(models.Model): self._real_removed_attribute_registry = [] return self._real_removed_attribute_registry - @property - def _added_relationship_registry(self): - if not hasattr(self, '_real_added_relationship_registry'): - self._real_added_relationship_registry = {} - return self._real_added_relationship_registry - - @property - def _removed_relationship_registry(self): - if not hasattr(self, '_real_removed_relationship_registry'): - self._real_removed_relationship_registry = [] - return self._real_removed_relationship_registry - def save(self, *args, **kwargs): super(Entity, self).save(*args, **kwargs) @@ -169,31 +241,17 @@ class Entity(models.Model): self.attribute_set.filter(key__exact=key).delete() del self._removed_attribute_registry[:] - for key, value in self._added_attribute_registry.items(): + for field, value in self._added_attribute_registry.items(): try: - attribute = self.attribute_set.get(key__exact=key) + attribute = self.attribute_set.get(key__exact=field.key) except Attribute.DoesNotExist: attribute = Attribute() attribute.entity = self - attribute.key = key - attribute.value = value + attribute.key = field.key + + field.set_attribute_value(attribute, value) attribute.save() self._added_attribute_registry.clear() - - for key in self._removed_relationship_registry: - self.relationship_set.filter(key__exact=key).delete() - del self._removed_relationship_registry[:] - - for key, value in self._added_relationship_registry.items(): - try: - relationship = self.relationship_set.get(key__exact=key) - except Relationship.DoesNotExist: - relationship = Relationship() - relationship.entity = self - relationship.key = key - relationship.value = value - relationship.save() - self._added_relationship_registry.clear() class Meta: abstract = True @@ -238,7 +296,7 @@ class TreeManager(models.Manager): class TreeModel(models.Model): objects = TreeManager() parent = models.ForeignKey('self', related_name='children', null=True, blank=True) - slug = models.SlugField() + slug = models.SlugField(max_length=255) def has_ancestor(self, ancestor): parent = self @@ -249,7 +307,9 @@ class TreeModel(models.Model): return False def get_path(self, root=None, pathsep='/', field='slug'): - if root is not None and self.has_ancestor(root): + if root is not None: + if not self.has_ancestor(root): + raise AncestorDoesNotExist(root) path = '' parent = self while parent and parent != root: @@ -273,7 +333,7 @@ class TreeModel(models.Model): abstract = True -class TreeEntity(TreeModel, Entity): +class TreeEntity(Entity, TreeModel): @property def attributes(self): if self.parent: