def __prop_to_dict(self, value, property_name, transform, export_dict,
bulkload_state):
"""Transform a single export-side field value to dict property.
Args:
value: Value from the entity or model instance.
property_name: Name of the value in the entity or model instance.
transform: Transform property, either an ExportEntry or PropertyEntry
export_dict: output dictionary.
bulkload_state: Passed bulkload state.
Raises:
ErrorOnTransform, encapsulating an error encountered during the transform.
"""
if transform.export_transform:
try:
if transform.export_transform.supports_bulkload_state:
transformed_value = transform.export_transform(
value, bulkload_state=bulkload_state)
else:
transformed_value = transform.export_transform(value)
except Exception, err:
raise bulkloader_errors.ErrorOnTransform(
'Error on transform. '
'Property: %s External Name: %s. Code: %s Details: %s' %
(property_name, transform.external_name,
transform.export_transform, err))
def __create_instance(self, input_dict, bulkload_state):
"""Return a model instance or entity from an input_dict.
Args:
input_dict: Neutral input dictionary describing a single input record.
bulkload_state: bulkload_state object describing the global state.
Returns:
Entity or model instance, or collection of entity or model instances,
to be uploaded.
"""
key = None
parent = None
if self._create_key:
key = self.__dict_to_prop(self._create_key, input_dict,
bulkload_state)
if isinstance(key, datastore.Key):
if not key.name():
raise bulkloader_errors.ErrorOnTransform(
'Numeric keys are not supported on input at this time.'
)
parent = key.parent()
key = key.name()
if self._transformer_spec.model:
instance = self._transformer_spec.model(key_name=key,
parent=parent)
else:
instance = datastore.Entity(self._transformer_spec.kind,
parent=parent,
name=key)
return instance
