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class JSONDescriptor(object): |
def __init__(self, field): |
self.field = field |
def __get__(self, instance, owner): |
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): |
instance.__dict__[self.field.name] = value |
setattr(instance, self.field.attname, json.dumps(value)) |
def __delete__(self, instance): |
del(instance.__dict__[self.field.name]) |
setattr(instance, self.field.attname, json.dumps(None)) |
class JSONField(models.TextField): |
""""""A :class:`TextField` which stores its value on the model instance as a python object and stores its value in the database as JSON. Validated with :func:`.json_validator`."""""" |
default_validators = [json_validator] |
def get_attname(self): |
return ""%s_json"" % self.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 fix_init_kwarg(self, sender, args, kwargs, **signal_kwargs): |
# Anything passed in as self.name is assumed to come from a serializer and |
# will be treated as a json string. |
if self.name in kwargs: |
value = kwargs.pop(self.name) |
# Hack to handle the xml serializer's handling of ""null"" |
if value is None: |
value = 'null' |
kwargs[self.attname] = value |
def formfield(self, *args, **kwargs): |
kwargs[""form_class""] = JSONFormField |
return super(JSONField, self).formfield(*args, **kwargs) |
class SlugMultipleChoiceField(models.Field): |
""""""Stores a selection of multiple items with unique slugs in the form of a comma-separated list. Also knows how to correctly handle :class:`RegistryIterator`\ s passed in as choices."""""" |
__metaclass__ = models.SubfieldBase |
description = _(""Comma-separated slug field"") |
def get_internal_type(self): |
return ""TextField"" |
def to_python(self, value): |
if not value: |
return [] |
if isinstance(value, list): |
return value |
return value.split(',') |
def get_prep_value(self, value): |
return ','.join(value) |
def formfield(self, **kwargs): |
# This is necessary because django hard-codes TypedChoiceField for things with choices. |
defaults = { |
'widget': forms.CheckboxSelectMultiple, |
'choices': self.get_choices(include_blank=False), |
'label': capfirst(self.verbose_name), |
'required': not self.blank, |
'help_text': self.help_text |
} |
if self.has_default(): |
if callable(self.default): |
defaults['initial'] = self.default |
defaults['show_hidden_initial'] = True |
else: |
defaults['initial'] = self.get_default() |
for k in kwargs.keys(): |
if k not in ('coerce', 'empty_value', 'choices', 'required', |
'widget', 'label', 'initial', 'help_text', |
'error_messages', 'show_hidden_initial'): |
del kwargs[k] |
defaults.update(kwargs) |
form_class = forms.TypedMultipleChoiceField |
return form_class(**defaults) |
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