Module entity (2.1.6)

Version 2.1.6

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Class for representing a single entity in the Cloud Datastore.

Classes

Entity

Entity(key=None, exclude_from_indexes=())

Entities are akin to rows in a relational database

An entity storing the actual instance of data.

Each entity is officially represented with a xref_Key, 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 xref_get to retrieve an existing entity:

.. testsetup:: entity-ctor

import os
import uuid

from google.cloud import datastore
from tests.system.test_system import Config  # system tests

unique = os.getenv('CIRCLE_BUILD_NUM', str(uuid.uuid4())[0:8])
client = datastore.Client(namespace='ns{}'.format(unique))
key = client.key('EntityKind', 1234, namespace='_Doctest')
entity = datastore.Entity(key=key)
entity['property'] = 'value'
Config.TO_DELETE.append(entity)

client.put(entity)

.. doctest:: entity-ctor

>>> client.get(key)
<Entity('EntityKind', 1234) {'property': 'value'}>

You can the set values on the entity just like you would on any other dictionary.

.. doctest:: entity-ctor

>>> entity['age'] = 20
>>> entity['name'] = 'JJ'

However, not all types are allowed as a value for a Google Cloud Datastore entity. The following basic types are supported by the API:

• datetime.datetime
• xref_Key
• bool
• float
• int (as well as long in Python 2)
• unicode (called str in Python 3)
• bytes (called str in Python 2)
• xref_GeoPoint
• :data:None

In addition, three container types are supported:

• list
• xref_Entity
• dict (will just be treated like an Entity without a key or exclude_from_indexes)

Each entry in a list must be one of the value types (basic or container) and each value in an xref_Entity must as well. In this case an xref_Entity as a container acts as a dict, but also has the special annotations of key and exclude_from_indexes.

And you can treat an entity like a regular Python dictionary:

.. testsetup:: entity-dict

from google.cloud import datastore

entity = datastore.Entity()
entity['age'] = 20
entity['name'] = 'JJ'

.. doctest:: entity-dict

>>> sorted(entity.keys())
['age', 'name']
>>> sorted(entity.items())
[('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.

Parameters
Name	Description
key	Key Optional key to be set on entity.
exclude_from_indexes	tuple of string Names of fields whose values are not to be indexed for this entity.