X-Git-Url: http://git.ithinksw.org/philo.git/blobdiff_plain/82e22de23b182353e35aa4e2fde0c08f4df5653f..15c68a7a08349d807c767cce58fdbeec0dcc192d:/models/fields.py diff --git a/models/fields.py b/models/fields.py index 9fc2dfb..0289e57 100644 --- a/models/fields.py +++ b/models/fields.py @@ -1,128 +1,63 @@ -from django.db import models from django import forms -from django.core.exceptions import FieldError -from philo.models.base import Entity -from philo.signals import entity_class_prepared +from django.db import models +from django.utils import simplejson as json +from philo.forms.fields import JSONFormField +from philo.validators import TemplateValidator, json_validator -__all__ = ('AttributeField', 'RelationshipField') +class TemplateField(models.TextField): + def __init__(self, allow=None, disallow=None, secure=True, *args, **kwargs): + super(TemplateField, self).__init__(*args, **kwargs) + self.validators.append(TemplateValidator(allow, disallow, secure)) -class EntityProxyField(object): - descriptor_class = None - - def __init__(self, *args, **kwargs): - if self.descriptor_class is None: - raise NotImplementedError('EntityProxyField subclasses must specify a descriptor_class.') - - def actually_contribute_to_class(self, sender, **kwargs): - sender._entity_meta.add_proxy_field(self) - setattr(sender, self.attname, self.descriptor_class(self)) - - def contribute_to_class(self, cls, name): - if issubclass(cls, Entity): - self.name = name - self.attname = name - entity_class_prepared.connect(self.actually_contribute_to_class, sender=cls) - else: - raise FieldError('%s instances can only be declared on Entity subclasses.' % self.__class__.__name__) - - def formfield(self, *args, **kwargs): - raise NotImplementedError('EntityProxyField subclasses must implement a formfield method.') - - def value_from_object(self, obj): - return getattr(obj, self.attname) - - -class AttributeFieldDescriptor(object): +class JSONDescriptor(object): def __init__(self, field): self.field = field def __get__(self, instance, owner): - if instance: - if self.field.key in instance._added_attribute_registry: - return instance._added_attribute_registry[self.field.key] - if self.field.key in instance._removed_attribute_registry: - return None - try: - return instance.attributes[self.field.key] - except KeyError: - return None - else: - raise AttributeError('The \'%s\' attribute can only be accessed from %s instances.' % (self.field.name, owner.__name__)) + if instance is None: + raise AttributeError # ? + + if self.field.name not in instance.__dict__: + json_string = getattr(instance, self.field.attname) + instance.__dict__[self.field.name] = json.loads(json_string) + + return instance.__dict__[self.field.name] def __set__(self, instance, value): - if self.field.key in instance._removed_attribute_registry: - instance._removed_attribute_registry.remove(self.field.key) - instance._added_attribute_registry[self.field.key] = value + instance.__dict__[self.field.name] = value + setattr(instance, self.field.attname, json.dumps(value)) def __delete__(self, instance): - if self.field.key in instance._added_attribute_registry: - del instance._added_attribute_registry[self.field.key] - instance._removed_attribute_registry.append(self.field.key) + del(instance.__dict__[self.field.name]) + setattr(instance, self.field.attname, json.dumps(None)) -class AttributeField(EntityProxyField): - descriptor_class = AttributeFieldDescriptor +class JSONField(models.TextField): + default_validators = [json_validator] - def __init__(self, key, field_template=None): - self.key = key - if field_template is None: - field_template = models.CharField(max_length=255) - self.field_template = field_template + def get_attname(self): + return "%s_json" % self.name - def formfield(self, *args, **kwargs): - field = self.field_template.formfield(*args, **kwargs) - field.required = False - return field - - -class RelationshipFieldDescriptor(object): - def __init__(self, field): - self.field = field - - def __get__(self, instance, owner): - if instance: - if self.field.key in instance._added_relationship_registry: - return instance._added_relationship_registry[self.field.key] - if self.field.key in instance._removed_relationship_registry: - return None - try: - return instance.relationships[self.field.key] - except KeyError: - return None - else: - raise AttributeError('The \'%s\' attribute can only be accessed from %s instances.' % (self.field.name, owner.__name__)) + def contribute_to_class(self, cls, name): + super(JSONField, self).contribute_to_class(cls, name) + setattr(cls, name, JSONDescriptor(self)) + models.signals.pre_init.connect(self.fix_init_kwarg, sender=cls) - def __set__(self, instance, value): - if isinstance(value, (models.Model, type(None))): - if self.field.key in instance._removed_relationship_registry: - instance._removed_relationship_registry.remove(self.field.key) - instance._added_relationship_registry[self.field.key] = value - else: - raise AttributeError('The \'%s\' attribute can only be set using existing Model objects.' % self.field.name) + def fix_init_kwarg(self, sender, args, kwargs, **signal_kwargs): + if self.name in kwargs: + kwargs[self.attname] = json.dumps(kwargs.pop(self.name)) - def __delete__(self, instance): - if self.field.key in instance._added_relationship_registry: - del instance._added_relationship_registry[self.field.key] - instance._removed_relationship_registry.append(self.field.key) + def formfield(self, *args, **kwargs): + kwargs["form_class"] = JSONFormField + return super(JSONField, self).formfield(*args, **kwargs) -class RelationshipField(EntityProxyField): - descriptor_class = RelationshipFieldDescriptor - - def __init__(self, key, model, limit_choices_to=None): - self.key = key - self.model = model - if limit_choices_to is None: - limit_choices_to = {} - self.limit_choices_to = limit_choices_to - - def formfield(self, form_class=forms.ModelChoiceField, **kwargs): - field = form_class(self.model._default_manager.complex_filter(self.limit_choices_to), **kwargs) - field.required = False - return field - - def value_from_object(self, obj): - relobj = super(RelationshipField, self).value_from_object(obj) - return getattr(relobj, 'pk', None) \ No newline at end of file +try: + from south.modelsinspector import add_introspection_rules +except ImportError: + pass +else: + add_introspection_rules([], ["^philo\.models\.fields\.TemplateField"]) + add_introspection_rules([], ["^philo\.models\.fields\.JSONField"]) \ No newline at end of file