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        "description": "About tgext.evolve\n==================\n\ntgext.evolve is a TurboGears2 extension for generic migrations and evolutions.\n\ntgext.evolve *is safe to be used in multiprocessing and multithreading environments*\nas it relies on a distributed lock on your database to perform evolutions.\n\nDuring the evolution period the application will respond with a **503** status code,\nfeel free to configure TurboGears to trap it and use your ErrorController to provide\na custom page.\n\nInstalling\n----------\n\ntgext.evolve can be installed from pypi::\n\n    pip install tgext.evolve\n\nshould just work for most of the users.\n\nEnabling\n--------\n\nTo enable tgext.evolve put inside your application\n``config/app_cfg.py`` the following::\n\n    import tgext.evolve\n    tgext.evolve.plugme(base_config, options={\n        'evolutions': [\n            # ... Your evolutions ...\n        ]\n    })\n\nor you can use ``tgext.pluggable`` when available::\n\n    from tgext.pluggable import plug\n    plug(base_config, 'tgext.evolve', evolutions=[\n        # ... Your evolutions ...\n    ])\n\ntgext.evolve can then be disabled using the ``tgext.evolve.enabled = false``\noption in your configuration files. This is often the case during test suites.\n\nUsing Evolutions\n----------------\n\nEvolutions are a subclass of ``tgext.evolve.Evolution`` that\nmust provide an ``evolution_id`` property and an ``evolve()``\nmethod.\n\nHere is a sample evolution that does not much apart waiting for 10 seconds::\n\n    import time\n    from tgext.evolve import Evolution\n\n    class TestEvolution1(Evolution):\n        evolution_id = 'test_evolution_1'\n\n        def evolve(self):\n            time.sleep(10)\n\nPlease note that in case you modify data or touch the database\nthrough ``model.DBSession`` or other manners you must ``flush``\nand ``commit`` your UnitOfWork and Transaction yourself as evolutions\nare performed outside the transaction manager in a separated thread.\n\nThen you can register your evolution with something like::\n\n    from tgext.pluggable import plug\n    plug(base_config, 'tgext.evolve', evolutions=[\n        TestEvolution1\n    ])\n\nIn case your evolution requires parameters you can register an\ninstance of it instead of registering the class.\n\n.. note::\n\n    There is no opposite to the ``evolve()`` method as there is no\n    guarantee that evolutions are reversible. In case you need\n    reversible migrations for database schemas please use a\n    schema migration framework.\n\nChangeLog\n---------\n\n0.0.5\n~~~~~\n\n* small bugfix and deprecation gardening\n\n0.0.4\n~~~~~\n\n* small Python3 compatibility fixes\n\n0.0.3\n~~~~~\n\n* Experimental support for SQLAlchemy, tested on SQLite and MySQL.\n\n0.0.2\n~~~~~\n\n* Allow disabling tgext.evolve using ``tgext.evolve.enabled = False`` in `.ini` files.\n\n0.0.1\n~~~~~\n\n* First release with only MongoDB/Ming support.\n",
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