def _compare(self, other):
"""Compare this result to another result for sorting.
Args:
other (_Result): The other result to compare to.
Returns:
int: :data:`-1` if this result should come before `other`,
:data:`0` if this result is equivalent to `other` for sorting
purposes, or :data:`1` if this result should come after
`other`.
Raises:
NotImplemented: If `order_by` was not passed to constructor or is
:data:`None` or is empty.
NotImplemented: If `other` is not a `_Result`.
"""
if not self.order_by:
raise NotImplementedError("Can't sort result set without order_by")
if not isinstance(other, _Result):
return NotImplemented
for order in self.order_by:
if order.name == "__key__":
this_value = helpers.key_from_protobuf(
self.result_pb.entity.key).flat_path
other_value = helpers.key_from_protobuf(
other.result_pb.entity.key).flat_path
else:
this_value_pb = self.result_pb.entity.properties[order.name]
this_value = helpers._get_value_from_value_pb(this_value_pb)
other_value_pb = other.result_pb.entity.properties[order.name]
other_value = helpers._get_value_from_value_pb(other_value_pb)
# Compare key paths if ordering by key property
if isinstance(this_value, Key):
this_value = this_value.flat_path
if isinstance(other_value, Key):
other_value = other_value.flat_path
direction = -1 if order.reverse else 1
if this_value < other_value:
return -direction
elif this_value > other_value:
return direction
return 0
def entity(self):
"""Get an entity for an entity result.
Args:
projection (Optional[Sequence[str]]): Sequence of property names to
be projected in the query results.
Returns:
Union[model.Model, key.Key]: The processed result.
"""
if self.result_type == RESULT_TYPE_FULL:
entity = model._entity_from_protobuf(self.result_pb.entity)
return entity
elif self.result_type == RESULT_TYPE_PROJECTION:
entity = model._entity_from_protobuf(self.result_pb.entity)
projection = tuple(self.result_pb.entity.properties.keys())
entity._set_projection(projection)
return entity
elif self.result_type == RESULT_TYPE_KEY_ONLY:
key_pb = self.result_pb.entity.key
ds_key = helpers.key_from_protobuf(key_pb)
key = key_module.Key._from_ds_key(ds_key)
return key
raise NotImplementedError(
"Got unexpected entity result type for query.")
def get_multi(self, keys, missing=None, deferred=None, transaction=None):
"""Retrieve entities, along with their attributes.
:type keys: list of :class:`google.cloud.datastore.key.Key`
:param keys: The keys to be retrieved from the datastore.
:type missing: list
:param missing: (Optional) If a list is passed, the key-only entities
returned by the backend as "missing" will be copied
into it. If the list is not empty, an error will occur.
:type deferred: list
:param deferred: (Optional) If a list is passed, the keys returned
by the backend as "deferred" will be copied into it.
If the list is not empty, an error will occur.
:type transaction: :class:`~.transaction.Transaction`
:param transaction: (Optional) Transaction to use for read consistency.
If not passed, uses current transaction, if set.
:rtype: list of :class:`google.cloud.datastore.entity.Entity`
:returns: The requested entities.
:raises: :class:`ValueError` if one or more of ``keys`` has a project
which does not match our project.
"""
if not keys:
return []
ids = set(key.project for key in keys)
for current_id in ids:
if current_id != self.project:
raise ValueError('Keys do not match project')
if transaction is None:
transaction = self.current_transaction
entity_pbs = _extended_lookup(
connection=self.connection,
project=self.project,
key_pbs=[k.to_protobuf() for k in keys],
missing=missing,
deferred=deferred,
transaction_id=transaction and transaction.id,
)
if missing is not None:
missing[:] = [
helpers.entity_from_protobuf(missed_pb)
for missed_pb in missing
]
if deferred is not None:
deferred[:] = [
helpers.key_from_protobuf(deferred_pb)
for deferred_pb in deferred
]
return [
helpers.entity_from_protobuf(entity_pb) for entity_pb in entity_pbs
]
def put(entity, options):
"""Store an entity in datastore.
The entity can be a new entity to be saved for the first time or an
existing entity that has been updated.
Args:
entity_pb (datastore.Entity): The entity to be stored.
options (_options.Options): Options for this request.
Returns:
tasklets.Future: Result will be completed datastore key
(datastore.Key) for the entity.
"""
context = context_module.get_context()
use_global_cache = context._use_global_cache(entity.key, options)
use_datastore = context._use_datastore(entity.key, options)
if not (use_global_cache or use_datastore):
raise TypeError("use_global_cache and use_datastore can't both be False")
if not use_datastore and entity.key.is_partial:
raise TypeError("Can't store partial keys when use_datastore is False")
lock = None
entity_pb = helpers.entity_to_protobuf(entity)
cache_key = _cache.global_cache_key(entity.key)
if use_global_cache and not entity.key.is_partial:
if use_datastore:
lock = yield _cache.global_lock_for_write(cache_key)
else:
expires = context._global_cache_timeout(entity.key, options)
cache_value = entity_pb.SerializeToString()
yield _cache.global_set(cache_key, cache_value, expires=expires)
if use_datastore:
transaction = context.transaction
if transaction:
batch = _get_commit_batch(transaction, options)
else:
batch = _batch.get_batch(_NonTransactionalCommitBatch, options)
key_pb = yield batch.put(entity_pb)
if key_pb:
key = helpers.key_from_protobuf(key_pb)
else:
key = None
if lock:
if transaction:
def callback():
_cache.global_unlock_for_write(cache_key, lock).result()
context.call_on_transaction_complete(callback)
else:
yield _cache.global_unlock_for_write(cache_key, lock)
raise tasklets.Return(key)
def get_multi(self, keys, missing=None, deferred=None, transaction=None):
"""Retrieve entities, along with their attributes.
:type keys: list of :class:`google.cloud.datastore.key.Key`
:param keys: The keys to be retrieved from the datastore.
:type missing: list
:param missing: (Optional) If a list is passed, the key-only entities
returned by the backend as "missing" will be copied
into it. If the list is not empty, an error will occur.
:type deferred: list
:param deferred: (Optional) If a list is passed, the keys returned
by the backend as "deferred" will be copied into it.
If the list is not empty, an error will occur.
:type transaction: :class:`~.transaction.Transaction`
:param transaction: (Optional) Transaction to use for read consistency.
If not passed, uses current transaction, if set.
:rtype: list of :class:`google.cloud.datastore.entity.Entity`
:returns: The requested entities.
:raises: :class:`ValueError` if one or more of ``keys`` has a project
which does not match our project.
"""
if not keys:
return []
ids = set(key.project for key in keys)
for current_id in ids:
if current_id != self.project:
raise ValueError('Keys do not match project')
if transaction is None:
transaction = self.current_transaction
entity_pbs = _extended_lookup(
connection=self.connection,
project=self.project,
key_pbs=[k.to_protobuf() for k in keys],
missing=missing,
deferred=deferred,
transaction_id=transaction and transaction.id,
)
if missing is not None:
missing[:] = [
helpers.entity_from_protobuf(missed_pb)
for missed_pb in missing]
if deferred is not None:
deferred[:] = [
helpers.key_from_protobuf(deferred_pb)
for deferred_pb in deferred]
return [helpers.entity_from_protobuf(entity_pb)
for entity_pb in entity_pbs]
def entity(self):
"""Get an entity for an entity result. Use the cache if available.
Args:
projection (Optional[Sequence[str]]): Sequence of property names to
be projected in the query results.
Returns:
Union[model.Model, key.Key]: The processed result.
"""
if self.result_type == RESULT_TYPE_FULL:
# First check the cache.
context = context_module.get_context()
key_pb = self.result_pb.entity.key
ds_key = helpers.key_from_protobuf(key_pb)
key = key_module.Key._from_ds_key(ds_key)
entity = _KEY_NOT_IN_CACHE
use_cache = context._use_cache(key)
if use_cache:
try:
entity = context.cache.get_and_validate(key)
except KeyError:
pass
if entity is _KEY_NOT_IN_CACHE:
# entity not in cache, create one.
entity = model._entity_from_protobuf(self.result_pb.entity)
return entity
elif self.result_type == RESULT_TYPE_PROJECTION:
entity = model._entity_from_protobuf(self.result_pb.entity)
projection = tuple(self.result_pb.entity.properties.keys())
entity._set_projection(projection)
return entity
elif self.result_type == RESULT_TYPE_KEY_ONLY:
key_pb = self.result_pb.entity.key
ds_key = helpers.key_from_protobuf(key_pb)
key = key_module.Key._from_ds_key(ds_key)
return key
raise NotImplementedError(
"Got unexpected entity result type for query.")
def key(self):
"""Construct the key for this result.
Returns:
key.Key: The key.
"""
if self._key is None:
key_pb = self.result_pb.entity.key
ds_key = helpers.key_from_protobuf(key_pb)
self._key = key_module.Key._from_ds_key(ds_key)
return self._key
def _call_fut(self, val):
from google.cloud.datastore.helpers import key_from_protobuf
return key_from_protobuf(val)
def _call_fut(self, val):
from google.cloud.datastore.helpers import key_from_protobuf
return key_from_protobuf(val)
def get_multi(
self,
keys,
missing=None,
deferred=None,
transaction=None,
eventual=False,
retry=None,
timeout=None,
):
"""Retrieve entities, along with their attributes.
:type keys: list of :class:`google.cloud.datastore.key.Key`
:param keys: The keys to be retrieved from the datastore.
:type missing: list
:param missing: (Optional) If a list is passed, the key-only entities
returned by the backend as "missing" will be copied
into it. If the list is not empty, an error will occur.
:type deferred: list
:param deferred: (Optional) If a list is passed, the keys returned
by the backend as "deferred" will be copied into it.
If the list is not empty, an error will occur.
:type transaction:
:class:`~google.cloud.datastore.transaction.Transaction`
:param transaction: (Optional) Transaction to use for read consistency.
If not passed, uses current transaction, if set.
:type eventual: bool
:param eventual: (Optional) Defaults to strongly consistent (False).
Setting True will use eventual consistency, but cannot
be used inside a transaction or will raise ValueError.
:type retry: :class:`google.api_core.retry.Retry`
:param retry:
A retry object used to retry requests. If ``None`` is specified,
requests will be retried using a default configuration.
:type timeout: float
:param timeout:
Time, in seconds, to wait for the request to complete.
Note that if ``retry`` is specified, the timeout applies
to each individual attempt.
:rtype: list of :class:`google.cloud.datastore.entity.Entity`
:returns: The requested entities.
:raises: :class:`ValueError` if one or more of ``keys`` has a project
which does not match our project.
:raises: :class:`ValueError` if eventual is True and in a transaction.
"""
if not keys:
return []
ids = set(key.project for key in keys)
for current_id in ids:
if current_id != self.project:
raise ValueError("Keys do not match project")
if transaction is None:
transaction = self.current_transaction
entity_pbs = _extended_lookup(
datastore_api=self._datastore_api,
project=self.project,
key_pbs=[key.to_protobuf() for key in keys],
eventual=eventual,
missing=missing,
deferred=deferred,
transaction_id=transaction and transaction.id,
retry=retry,
timeout=timeout,
)
if missing is not None:
missing[:] = [
helpers.entity_from_protobuf(missed_pb)
for missed_pb in missing
]
if deferred is not None:
deferred[:] = [
helpers.key_from_protobuf(deferred_pb)
for deferred_pb in deferred
]
return [
helpers.entity_from_protobuf(entity_pb._pb)
for entity_pb in entity_pbs
]
