Skip to main content

Serialization for objects that TinyDB otherwise couldn't handle

Project description

Build Status Coverage Version

tinydb-serialization provides serialization for objects that TinyDB otherwise couldn’t handle.

Usage

General Usage

To use a serializer, create a SerializationMiddleware instance with the storage class you want to use and register the serializers you want to use. Then you pass the middleware instance as the storage to TinyDB:

>>> from tinydb import TinyDB, Query
>>> from tinydb.storages import JSONStorage
>>> from tinydb_serialization import SerializationMiddleware
>>> from tinydb_serialization.serializers import DateTimeSerializer
>>>
>>> from datetime import datetime
>>>
>>> serialization = SerializationMiddleware(JSONStorage)
>>> serialization.register_serializer(DateTimeSerializer(), 'TinyDate')
>>>
>>> db = TinyDB('db.json', storage=serialization)
>>> db.insert({'date': datetime(2000, 1, 1, 12, 0, 0)})
>>> db.all()
[{'date': datetime.datetime(2000, 1, 1, 12, 0)}]
>>> query = Query()
>>> db.insert({'date': datetime(2010, 1, 1, 12, 0, 0)})
>>> db.search(query.date > datetime(2005, 1, 1))
[{'date': datetime.datetime(2010, 1, 1, 12, 0)}]

Important: A SerializationMiddleware instance always wraps a database’s storage. This means that the SerializationMiddleware instance cannot be shared between multiple TinyDB instances as they would use the same underlying storage instance and thus share all data between both instances.

Provided Serializers

  • tinydb_serialization.serializers.DateTimeSerializer: serializes datetime objects as ISO 8601 formatted strings

Creating Custom Serializers

In this example we implement a serializer for datetime objects (like the one provided by this package):

from datetime import datetime
from tinydb_serialization import Serializer

class DateTimeSerializer(Serializer):
    OBJ_CLASS = datetime  # The class this serializer handles

    def encode(self, obj):
        return obj.isoformat()

    def decode(self, s):
        return datetime.fromisoformat(s)

Changelog

v2.1.1 (2023-07-24)

v2.1.0 (2021-01-23)

  • Include the DateTimeSerializer in this package (see issue #10)

  • Drop Python 3.6 support (as 3.7 is needed for date parsing)

v2.0.0 (2020-05-26)

v1.0.4 (2017-03-27)

  • Don’t modify the original element if it contains a list (see pull request #5)

v1.0.3 (2016-02-11)

  • Handle nested data (nested dicts, lists) properly when serializing/deserializing (see pull request #3)

v1.0.2 (2016-01-04)

v1.0.1 (2015-11-17)

  • Fix installation via pip (see issue #1)

v1.0.0 (2015-09-27)

  • Initial release on PyPI

Project details


Download files

Download the file for your platform. If you're not sure which to choose, learn more about installing packages.

Source Distribution

tinydb_serialization-2.1.1.tar.gz (4.9 kB view hashes)

Uploaded Source

Built Distribution

tinydb_serialization-2.1.1-py3-none-any.whl (5.7 kB view hashes)

Uploaded Python 3

Supported by

AWS AWS Cloud computing and Security Sponsor Datadog Datadog Monitoring Fastly Fastly CDN Google Google Download Analytics Microsoft Microsoft PSF Sponsor Pingdom Pingdom Monitoring Sentry Sentry Error logging StatusPage StatusPage Status page