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        "author": "Xin Huang",
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        "description": "****************\nNoSQL Versioning\n****************\n\nA Python library for NoSQL record versioning.\n\nInstallation\n============\n\nTo install the latest release on `PyPi <https://pypi.python.org/pypi/nosql_versioning>`_,\nsimply run:\n\n::\n\n  pip install nosql_versioning\n\nOr to install the latest development version, run:\n\n::\n\n  git clone https://github.com/xinhuang/nosql_versioning.git\n  cd nosql_versioning\n  python setup.py install\n\nQuick Tutorial\n==============\n\n.. code:: pycon\n\n  >>> from nosql_versioning import schema\n  >>> import json\n  >>>\n  >>> version, Record = schema(decode=json.loads)\n  >>>\n  >>> @version()\n  >>> class Recordv0(object):\n  >>>     def __init__(self, data):\n  >>>         self.old_name = data['old_name']\n  >>>\n  >>> @version(1)\n  >>> class Recordv1(object):\n  >>>     def __init__(self, value=None, *args, data=None):\n  >>>         if data:\n  >>>             self.new_name = data['new_name']\n  >>>         else:\n  >>>             self.new_name = value\n  >>>\n  >>>     @staticmethod\n  >>>     def migrate(data):\n  >>>         data['new_name'] = data['old_name']\n  >>>         del data['old_name']\n  >>>  \n  >>>     @staticmethod\n  >>>     def a_staticmethod(n):\n  >>>         print(n * 2)\n  >>>\n  >>> rec = Record('{\"_ver\": 0, \"old_name\": 1}')\n  >>> print(rec.new_name)\n  1\n  >>> rec = Record(value=42)         # custom constructor can also be used\n  >>> print(rec.new_name)\n  42\n  >>> Record.a_staticmethod(42)      # static methods defined in the latest version can be used\n  84\n\n\nAPI Reference\n=============\n\n``schema(decode=decode, version=get_version)``\n  Create a class descriptor to specify record classes of different version, and a Record initializer to instantiate the latest record from data, or to migrate data to the latest version.\n\n  :Args:\n    * ``decode``: Deserialize objects retrieved from database. By default no decoding will be applied.\n    * ``version``: Get version from record. By default it's ``data.get('_ver')``\n\n  :Returns:\n    * ``version``: A class descriptor to specify record version.\n    * ``Record``: A initializer that to construct defined Record class. Migrate if data is not the latest version.\n\n``version(n=0)``\n  A class descriptor to specify record class of version N.\n\n  :Args:\n    * ``n``: Version. Must be a integer.\n\n  :Raises:\n    * ``VersionConflictionException``: When a version is defined twice.\n\n``Record(data=None, *args, **kwargs)``\n  The initializer to migrate record to latest and instantiate record class.\n\n  :Args:\n    * ``data``: If only this argument is specified, ``decode(data)`` will be used to instantiate the latest record class. (Migrate if needed.)\n    * ``args``, ``kwargs``: If not only ``data`` is specified, all arguments will be passed to instantiate the latest record class. No migration.\n\nMigration from Version N-1 to N will use static method ``migrate`` in record class version N.\n\nIn case there is no version specified, migration from None to 0 will use static method ``migrate`` in record class Version 0.\n\nLicensing\n=========\n\nThis project is released under the terms of the MIT Open Source License. View\n*LICENSE.txt* for more information.\n",
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