X-Git-Url: http://git.ithinksw.org/philo.git/blobdiff_plain/5db80d3eeab1b27ef38f6b5b815e7ed51564ee3c..1d3756407233b937d7491bde6dd4046fb8b4b6d6:/models/base.py?ds=inline diff --git a/models/base.py b/models/base.py index 2f5bf93..5d9d761 100644 --- a/models/base.py +++ b/models/base.py @@ -1,15 +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 @@ -29,57 +34,155 @@ 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): + 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): + self.value = cleaned_data.get('value', None) + + 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') - value_object_id = models.PositiveIntegerField(verbose_name='Value 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) value = generic.GenericForeignKey('value_content_type', 'value_object_id') + key = models.CharField(max_length=255) + + def get_value_class(self, value): + if isinstance(value, models.query.QuerySet): + return ManyToManyValue + elif isinstance(value, models.Model) or (value is None and self.value_content_type.model_class() is ForeignKeyValue): + return ForeignKeyValue + else: + return JSONValue + + def set_value(self, value): + # is this useful? The best way of doing it? + value_class = self.get_value_class(value) + + if self.value is None or value_class != self.value_content_type.model_class(): + if self.value is not None: + self.value.delete() + new_value = value_class() + new_value.value = value + new_value.save() + self.value = new_value + else: + self.value.value = value + self.value.save() + 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): @@ -102,17 +205,65 @@ class QuerySetMapper(object, DictMixin): return list(keys) +class EntityOptions(object): + def __init__(self, options): + if options is not None: + for key, value in options.__dict__.items(): + setattr(self, key, value) + if not hasattr(self, 'proxy_fields'): + self.proxy_fields = [] + + def add_proxy_field(self, proxy_field): + self.proxy_fields.append(proxy_field) + + +class EntityBase(models.base.ModelBase): + def __new__(cls, name, bases, attrs): + new = super(EntityBase, cls).__new__(cls, name, bases, attrs) + entity_options = attrs.pop('EntityMeta', None) + setattr(new, '_entity_meta', EntityOptions(entity_options)) + entity_class_prepared.send(sender=new) + return new + + 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) + def _added_attribute_registry(self): + if not hasattr(self, '_real_added_attribute_registry'): + self._real_added_attribute_registry = {} + return self._real_added_attribute_registry + + @property + def _removed_attribute_registry(self): + if not hasattr(self, '_real_removed_attribute_registry'): + self._real_removed_attribute_registry = [] + return self._real_removed_attribute_registry + + def save(self, *args, **kwargs): + super(Entity, self).save(*args, **kwargs) + + for key in self._removed_attribute_registry: + self.attribute_set.filter(key__exact=key).delete() + del self._removed_attribute_registry[:] + + for key, value in self._added_attribute_registry.items(): + try: + attribute = self.attribute_set.get(key__exact=key) + except Attribute.DoesNotExist: + attribute = Attribute() + attribute.entity = self + attribute.key = key + attribute.set_value(value) + attribute.save() + self._added_attribute_registry.clear() class Meta: abstract = True @@ -157,15 +308,33 @@ 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 get_path(self, pathsep='/', field='slug'): - path = getattr(self, field, '?') - parent = self.parent + def has_ancestor(self, ancestor): + parent = self while parent: - path = getattr(parent, field, '?') + pathsep + path + if parent == ancestor: + return True parent = parent.parent - return path + return False + + def get_path(self, root=None, pathsep='/', field='slug'): + if root is not None: + if not self.has_ancestor(root): + raise AncestorDoesNotExist(root) + path = '' + parent = self + while parent and parent != root: + path = getattr(parent, field, '?') + pathsep + path + parent = parent.parent + return path + else: + path = getattr(self, field, '?') + parent = self.parent + while parent and parent != root: + path = getattr(parent, field, '?') + pathsep + path + parent = parent.parent + return path path = property(get_path) def __unicode__(self): @@ -176,7 +345,7 @@ class TreeModel(models.Model): abstract = True -class TreeEntity(TreeModel, Entity): +class TreeEntity(Entity, TreeModel): @property def attributes(self): if self.parent: