def test_get_entity_hit(self):
from gcloud.datastore.connection import datastore_pb
from gcloud.datastore.key import Key
DATASET_ID = 'DATASET'
KIND = 'Kind'
ID = 1234
PATH = [{'kind': KIND, 'id': ID}]
entity_pb = datastore_pb.Entity()
path_element = entity_pb.key.path_element.add()
path_element.kind = KIND
path_element.id = ID
prop = entity_pb.property.add()
prop.name = 'foo'
prop.value.string_value = 'Foo'
connection = _Connection(entity_pb)
dataset = self._makeOne(DATASET_ID, connection)
key = Key(dataset=dataset, path=PATH)
result = dataset.get_entity(key)
key = result.key()
self.assertTrue(key.dataset() is dataset)
self.assertEqual(key.path(), PATH)
self.assertEqual(list(result), ['foo'])
self.assertEqual(result['foo'], 'Foo')
def test_get_entities_hit(self):
from gcloud.datastore.connection import datastore_pb
from gcloud.datastore.key import Key
DATASET_ID = 'DATASET'
KIND = 'Kind'
ID = 1234
PATH = [{'kind': KIND, 'id': ID}]
entity_pb = datastore_pb.Entity()
entity_pb.key.partition_id.dataset_id = DATASET_ID
path_element = entity_pb.key.path_element.add()
path_element.kind = KIND
path_element.id = ID
prop = entity_pb.property.add()
prop.name = 'foo'
prop.value.string_value = 'Foo'
connection = _Connection(entity_pb)
dataset = self._makeOne(DATASET_ID, connection)
key = Key(path=PATH)
result, = dataset.get_entities([key])
key = result.key()
self.assertEqual(key._dataset_id, DATASET_ID)
self.assertEqual(key.path(), PATH)
self.assertEqual(list(result), ['foo'])
self.assertEqual(result['foo'], 'Foo')
class Entity(dict):
"""Entities are akin to rows in a relational database
An entity storing the actual instance of data.
Each entity is officially represented with a
:class:`gcloud.datastore.key.Key` class, however it is possible that
you might create an Entity with only a partial Key (that is, a Key
with a Kind, and possibly a parent, but without an ID). In such a
case, the datastore service will automatically assign an ID to the
partial key.
Entities in this API act like dictionaries with extras built in that
allow you to delete or persist the data stored on the entity.
Entities are mutable and act like a subclass of a dictionary.
This means you could take an existing entity and change the key
to duplicate the object.
Use :func:`gcloud.datastore.dataset.Dataset.get_entity`
to retrieve an existing entity.
>>> dataset.get_entity(key)
<Entity[{'kind': 'EntityKind', id: 1234}] {'property': 'value'}>
You can the set values on the entity just like you would on any
other dictionary.
>>> entity['age'] = 20
>>> entity['name'] = 'JJ'
>>> entity
<Entity[{'kind': 'EntityKind', id: 1234}] {'age': 20, 'name': 'JJ'}>
And you can convert an entity to a regular Python dictionary with the
`dict` builtin:
>>> dict(entity)
{'age': 20, 'name': 'JJ'}
.. note::
When saving an entity to the backend, values which are "text"
('unicode' in Python2, 'str' in Python3) will be saved using
the 'text_value' field, after being encoded to UTF-8. When
retrieved from the back-end, such values will be decoded to "text"
again. Values which are "bytes" ('str' in Python2, 'bytes' in
Python3), will be saved using the 'blob_value' field, without
any decoding / encoding step.
:type dataset: :class:`gcloud.datastore.dataset.Dataset`
:param dataset: The dataset in which this entity belongs.
:type kind: string
:param kind: The kind of entity this is, akin to a table name in a
relational database.
:type dataset: :class:`gcloud.datastore.dataset.Dataset`, or None
:param dataset: the Dataset instance associated with this entity.
:type kind: str
:param kind: the "kind" of the entity (see
https://cloud.google.com/datastore/docs/concepts/entities#Datastore_Kinds_and_identifiers)
:param exclude_from_indexes: names of fields whose values are not to be
indexed for this entity.
"""
def __init__(self, dataset=None, kind=None, exclude_from_indexes=()):
super(Entity, self).__init__()
self._dataset = dataset
if kind:
self._key = Key().kind(kind)
else:
self._key = None
self._exclude_from_indexes = set(exclude_from_indexes)
def dataset(self):
"""Get the :class:`.dataset.Dataset` in which this entity belongs.
.. note::
This is based on the :class:`gcloud.datastore.key.Key` set on the
entity. That means that if you have no key set, the dataset might
be `None`. It also means that if you change the key on the entity,
this will refer to that key's dataset.
:rtype: :class:`gcloud.datastore.dataset.Dataset`
:returns: The Dataset containing the entity if there is a key,
else None.
"""
return self._dataset
def key(self, key=None):
"""Get or set the :class:`.datastore.key.Key` on the current entity.
:type key: :class:`glcouddatastore.key.Key`
:param key: The key you want to set on the entity.
:rtype: :class:`gcloud.datastore.key.Key` or :class:`Entity`.
:returns: Either the current key (on get) or the current
object (on set).
>>> entity.key(my_other_key) # This returns the original entity.
<Entity[{'kind': 'OtherKeyKind', 'id': 1234}] {'property': 'value'}>
>>> entity.key() # This returns the key.
<Key[{'kind': 'OtherKeyKind', 'id': 1234}]>
"""
if key is not None:
self._key = key
return self
else:
return self._key
def kind(self):
"""Get the kind of the current entity.
.. note::
This relies entirely on the :class:`gcloud.datastore.key.Key`
set on the entity. That means that we're not storing the kind
of the entity at all, just the properties and a pointer to a
Key which knows its Kind.
"""
if self._key:
return self._key.kind()
def exclude_from_indexes(self):
"""Names of fields which are *not* to be indexed for this entity.
:rtype: sequence of field names
"""
return frozenset(self._exclude_from_indexes)
@classmethod
def from_key(cls, key, dataset=None):
"""Create entity based on :class:`.datastore.key.Key`.
.. note:: This is a factory method.
:type key: :class:`gcloud.datastore.key.Key`
:param key: The key for the entity.
:returns: The :class:`Entity` derived from the
:class:`gcloud.datastore.key.Key`.
"""
return cls(dataset).key(key)
@property
def _must_key(self):
"""Return our key, or raise NoKey if not set.
:rtype: :class:`gcloud.datastore.key.Key`.
:returns: our key
:raises: NoKey if key is None
"""
if self._key is None:
raise NoKey()
return self._key
@property
def _must_dataset(self):
"""Return our dataset, or raise NoDataset if not set.
:rtype: :class:`gcloud.datastore.key.Key`.
:returns: our key
:raises: NoDataset if key is None
"""
if self._dataset is None:
raise NoDataset()
return self._dataset
def reload(self):
"""Reloads the contents of this entity from the datastore.
This method takes the :class:`gcloud.datastore.key.Key`, loads all
properties from the Cloud Datastore, and sets the updated properties on
the current object.
.. warning::
This will override any existing properties if a different value
exists remotely, however it will *not* override any properties that
exist only locally.
"""
key = self._must_key
dataset = self._must_dataset
entity = dataset.get_entity(key.to_protobuf())
if entity:
self.update(entity)
return self
def save(self):
"""Save the entity in the Cloud Datastore.
.. note::
Any existing properties for the entity will be replaced by those
currently set on this instance. Already-stored properties which do
not correspond to keys set on this instance will be removed from
the datastore.
.. note::
Property values which are "text" ('unicode' in Python2, 'str' in
Python3) map to 'string_value' in the datastore; values which are
"bytes" ('str' in Python2, 'bytes' in Python3) map to 'blob_value'.
:rtype: :class:`gcloud.datastore.entity.Entity`
:returns: The entity with a possibly updated Key.
"""
key = self._must_key
dataset = self._must_dataset
connection = dataset.connection()
key_pb = connection.save_entity(
dataset_id=dataset.id(),
key_pb=key.to_protobuf(),
properties=dict(self),
exclude_from_indexes=self.exclude_from_indexes())
# If we are in a transaction and the current entity needs an
# automatically assigned ID, tell the transaction where to put that.
transaction = connection.transaction()
if transaction and key.is_partial():
transaction.add_auto_id_entity(self)
if isinstance(key_pb, datastore_pb.Key):
# Update the path (which may have been altered).
# NOTE: The underlying namespace can't have changed in a save().
# The value of the dataset ID may have changed from implicit
# (i.e. None, with the ID implied from the dataset.Dataset
# object associated with the Entity/Key), but if it was
# implicit before the save() we leave it as implicit.
path = []
for element in key_pb.path_element:
key_part = {}
for descriptor, value in element._fields.items():
key_part[descriptor.name] = value
path.append(key_part)
self._key = key.path(path)
return self
def delete(self):
"""Delete the entity in the Cloud Datastore.
.. note::
This is based entirely off of the :class:`gcloud.datastore.key.Key`
set on the entity. Whatever is stored remotely using the key on the
entity will be deleted.
"""
key = self._must_key
dataset = self._must_dataset
dataset.connection().delete_entities(
dataset_id=dataset.id(),
key_pbs=[key.to_protobuf()],
)
def __repr__(self):
if self._key:
return '<Entity%s %s>' % (self._key.path(), super(Entity,
self).__repr__())
else:
return '<Entity %s>' % (super(Entity, self).__repr__())
class Entity(dict):
""":type dataset: :class:`gcloud.datastore.dataset.Dataset`
:param dataset: The dataset in which this entity belongs.
:type kind: string
:param kind: The kind of entity this is, akin to a table name in a
relational database.
Entities are mutable and act like a subclass of a dictionary.
This means you could take an existing entity and change the key
to duplicate the object.
This can be used on its own, however it is likely easier to use
the shortcut methods provided by :class:`gcloud.datastore.dataset.Dataset`
such as:
- :func:`gcloud.datastore.dataset.Dataset.entity` to create a new entity.
>>> dataset.entity('MyEntityKind')
<Entity[{'kind': 'MyEntityKind'}] {}>
- :func:`gcloud.datastore.dataset.Dataset.get_entity`
to retrieve an existing entity.
>>> dataset.get_entity(key)
<Entity[{'kind': 'EntityKind', id: 1234}] {'property': 'value'}>
You can the set values on the entity
just like you would on any other dictionary.
>>> entity['age'] = 20
>>> entity['name'] = 'JJ'
>>> entity
<Entity[{'kind': 'EntityKind', id: 1234}] {'age': 20, 'name': 'JJ'}>
And you can cast an entity to a regular Python dictionary
with the `dict` builtin:
>>> dict(entity)
{'age': 20, 'name': 'JJ'}
.. note::
When saving an entity to the backend, values which are "text"
('unicode' in Python2, 'str' in Python3) will be saved using
the 'text_value' field, after being encoded to UTF-8. When
retrieved from the back-end, such values will be decoded to "text"
again. Values which are "bytes" ('str' in Python2, 'bytes' in
Python3), will be saved using the 'blob_value' field, without
any decoding / encoding step.
:type dataset: :class:`gcloud.datastore.dataset.Dataset`, or None
:param dataset: the Dataset instance associated with this entity.
:type kind: str
:param kind: the "kind" of the entity (see
https://cloud.google.com/datastore/docs/concepts/entities#Datastore_Kinds_and_identifiers)
:param exclude_from_indexes: names of fields whose values are not to be
indexed for this entity.
"""
def __init__(self, dataset=None, kind=None, exclude_from_indexes=()):
super(Entity, self).__init__()
self._dataset = dataset
if kind:
self._key = Key().kind(kind)
else:
self._key = None
self._exclude_from_indexes = set(exclude_from_indexes)
def dataset(self):
"""Get the :class:`.dataset.Dataset` in which this entity belongs.
:rtype: :class:`gcloud.datastore.dataset.Dataset`
:returns: The Dataset containing the entity if there is a key,
else None.
.. note::
This is based on the :class:`gcloud.datastore.key.Key` set on the
entity. That means that if you have no key set, the dataset might
be `None`. It also means that if you change the key on the entity,
this will refer to that key's dataset.
"""
return self._dataset
def key(self, key=None):
"""Get or set the :class:`.datastore.key.Key` on the current entity.
:type key: :class:`glcouddatastore.key.Key`
:param key: The key you want to set on the entity.
:rtype: :class:`gcloud.datastore.key.Key` or :class:`Entity`.
:returns: Either the current key (on get) or the current
object (on set).
>>> entity.key(my_other_key) # This returns the original entity.
<Entity[{'kind': 'OtherKeyKind', 'id': 1234}] {'property': 'value'}>
>>> entity.key() # This returns the key.
<Key[{'kind': 'OtherKeyKind', 'id': 1234}]>
"""
if key is not None:
self._key = key
return self
else:
return self._key
def kind(self):
"""Get the kind of the current entity.
.. note::
This relies entirely on
the :class:`gcloud.datastore.key.Key`
set on the entity.
That means that we're not storing the kind of the entity at all,
just the properties and a pointer to a Key
which knows its Kind.
"""
if self._key:
return self._key.kind()
def exclude_from_indexes(self):
"""Names of fields which are *not* to be indexed for this entity.
:rtype: sequence of field names
"""
return frozenset(self._exclude_from_indexes)
@classmethod
def from_key(cls, key, dataset=None):
"""Create entity based on :class:`.datastore.key.Key`.
.. note::
This is a factory method.
:type key: :class:`gcloud.datastore.key.Key`
:param key: The key for the entity.
:returns: The :class:`Entity` derived from the
:class:`gcloud.datastore.key.Key`.
"""
return cls(dataset).key(key)
@property
def _must_key(self):
"""Return our key, or raise NoKey if not set.
:rtype: :class:`gcloud.datastore.key.Key`.
:returns: our key
:raises: NoKey if key is None
"""
if self._key is None:
raise NoKey()
return self._key
@property
def _must_dataset(self):
"""Return our dataset, or raise NoDataset if not set.
:rtype: :class:`gcloud.datastore.key.Key`.
:returns: our key
:raises: NoDataset if key is None
"""
if self._dataset is None:
raise NoDataset()
return self._dataset
def reload(self):
"""Reloads the contents of this entity from the datastore.
This method takes the :class:`gcloud.datastore.key.Key`, loads all
properties from the Cloud Datastore, and sets the updated properties on
the current object.
.. warning::
This will override any existing properties if a different value
exists remotely, however it will *not* override any properties that
exist only locally.
"""
key = self._must_key
dataset = self._must_dataset
entity = dataset.get_entity(key.to_protobuf())
if entity:
self.update(entity)
return self
def save(self):
"""Save the entity in the Cloud Datastore.
.. note::
Any existing properties for the entity will be replaced by those
currently set on this instance. Already-stored properties which do
not correspond to keys set on this instance will be removed from
the datastore.
.. note::
Property values which are "text" ('unicode' in Python2, 'str' in
Python3) map to 'string_value' in the datastore; values which are
"bytes" ('str' in Python2, 'bytes' in Python3) map to 'blob_value'.
:rtype: :class:`gcloud.datastore.entity.Entity`
:returns: The entity with a possibly updated Key.
"""
key = self._must_key
dataset = self._must_dataset
connection = dataset.connection()
key_pb = connection.save_entity(
dataset_id=dataset.id(),
key_pb=key.to_protobuf(),
properties=dict(self),
exclude_from_indexes=self.exclude_from_indexes())
# If we are in a transaction and the current entity needs an
# automatically assigned ID, tell the transaction where to put that.
transaction = connection.transaction()
if transaction and key.is_partial():
transaction.add_auto_id_entity(self)
if isinstance(key_pb, datastore_pb.Key):
# Update the path (which may have been altered).
# NOTE: The underlying namespace can't have changed in a save().
# The value of the dataset ID may have changed from implicit
# (i.e. None, with the ID implied from the dataset.Dataset
# object associated with the Entity/Key), but if it was
# implicit before the save() we leave it as implicit.
path = []
for element in key_pb.path_element:
key_part = {}
for descriptor, value in element._fields.items():
key_part[descriptor.name] = value
path.append(key_part)
self._key = key.path(path)
return self
def delete(self):
"""Delete the entity in the Cloud Datastore.
.. note::
This is based entirely off of the :class:`gcloud.datastore.key.Key`
set on the entity. Whatever is stored remotely using the key on the
entity will be deleted.
"""
key = self._must_key
dataset = self._must_dataset
dataset.connection().delete_entities(
dataset_id=dataset.id(),
key_pbs=[key.to_protobuf()],
)
def __repr__(self):
if self._key:
return '<Entity%s %s>' % (self._key.path(),
super(Entity, self).__repr__())
else:
return '<Entity %s>' % (super(Entity, self).__repr__())
