def __init__(self, *args, pkey=False, type_=None, **kwargs):
if pkey:
if 'readonly' in kwargs and not kwargs['readonly']:
raise exceptions.ProgrammingError("attempt to create non-readonly primary key field")
if type_ is None:
raise exceptions.ProgrammingError("PKey field requires type")
kwargs['readonly'] = True
super().__init__(*args, **kwargs)
self._pkey = pkey
self._type = type_
def _extract_ids(self, values):
if not self.multi and len(values) > 1:
raise exceptions.ProgrammingError('More than one instance on a Single related field')
ids = []
for val in values:
type_ = type(val)
if val is None:
raise exceptions.ProgrammingError("None is not accepted for {}".format(type(self)))
elif type_ in (int, float, str):
ids.append(val)
elif issubclass(type_, world().get_instance_class(self.name)):
ids.append(val.id())
elif issubclass(type_, dict):
inst = world().new_instance(self.name)
inst.update(val)
ids.append(inst.id())
else:
raise exceptions.ProgrammingError('could not create {}'.format(type(self)))
return sorted(ids)
def __init__(self, *args, stores, multi, cascade=False, **kwargs):
if multi:
self._val_cls = MultiRelValue
if 'default' in kwargs and type(kwargs['default']) is not list:
raise exceptions.ProgrammingError("Multi field default must be a list")
elif 'default' not in kwargs:
kwargs['default'] = []
else:
self._val_cls = SingleRelValue
if 'default' in kwargs and type(kwargs['default']) is list:
raise exceptions.ProgrammingError("Multi field default cant be a list")
super().__init__(*args, **kwargs)
self.stores = stores
self.multi = multi
self.cascade = cascade
if cascade and multi:
# multi + cascade is not implemented
# (i'm not sure how it should work)
raise NotImplementedError("Cascade=True is not supported for Multi fields")
# this might be set in DataModel.connect(), but might also be left None
self.other = None
def load(self, instance, value):
if value is not None:
# just to be sure
raise exceptions.ProgrammingError("Calc field 'value' should always be None")
instance.set_value(self, self.val(lambda: self._getter(instance)))
def __init__(self, *args, getter=None, setter=None, **kwargs):
if kwargs.get('hidden'):
raise exceptions.ProgrammingError("Calc fields with hidden=True are not allowed")
super().__init__(*args, **kwargs)
self._getter = getter if getter else self._default_getter
self._setter = setter if setter else self._default_setter