{
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        "author": "Lovely Systems GmbH",
        "author_email": "office@lovelysystems.com",
        "bugtrack_url": null,
        "classifiers": [
            "Development Status :: 4 - Beta",
            "Intended Audience :: Developers",
            "License :: OSI Approved :: Zope Public License",
            "Topic :: Software Development :: Libraries :: Python Modules"
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        "description": "==========\nPersistent\n==========\n\nThis package provides a base class for persistent objects with the advantage\nthat the object is only marked as changed if an attribute has really changed.\n\n  >>> import transaction\n  >>> from ZODB.tests.util import DB\n\n  >>> from lovely import persistent\n\n  >>> p = LovelyPersistent()\n  >>> p._p_changed\n  False\n\n  >>> p.a = 1\n  >>> db = DB()\n  >>> conn = db.open()\n  >>> conn.root()['p'] = p\n  >>> transaction.commit()\n\nAfter commiting the changes the object is no longer in changed state.\n\n  >>> p._p_changed\n  False\n\nSetting a with its existing value doesn't put the object in cahnged state.\n\n  >>> p.a\n  1\n  >>> p.a = 1\n  >>> p._p_changed\n  False\n\nBut modifying a :\n\n  >>> p.a = 2\n  >>> p._p_changed\n  True\n  >>> transaction.commit()\n\n  >>> p._p_changed\n  False\n\nDeleting an attribute also put the object into changed state.\n\n  >>> del p.a\n  >>> p._p_changed\n  True\n\n\nSpecial Properties\n==================\n\nSpecial property implementations do work too. To show this we use the\nfieldproperties from zope.schema.\n\n  >>> from zope.schema.fieldproperty import FieldProperty\n  >>> from zope import schema, interface\n  >>> class IMyFace(interface.Interface):\n  ...     eyesOpen = schema.Bool(default=True, required=False)\n\n  >>> class MyFace(persistent.Persistent):\n  ...     eyesOpen = FieldProperty(IMyFace['eyesOpen'])\n\n  >>> persistent.tests.MyFace = MyFace\n  >>> MyFace.__module__ = persistent.tests.setUp.__module__\n  >>> myFace = conn.root()['myFace'] = MyFace()\n  >>> transaction.commit()\n\nDefault values.\n\n  >>> myFace.eyesOpen\n  True\n\nValidation.\n\n  >>> myFace.eyesOpen = 'not always'\n  Traceback (most recent call last):\n  ...\n  WrongType: ('not always', <type 'bool'>)\n\nNote, setting to default value does not change the object.\n\n  >>> transaction.commit()\n  >>> myFace.eyesOpen = True\n  >>> myFace._p_changed\n  False\n\n  >>> transaction.commit()\n  >>> myFace.eyesOpen = False\n  >>> myFace._p_changed\n  True\n\n\n\n============================\nChanges in lovely.persistent\n============================\n\n2007/12/10 0.1.1\n================\n\n- moved to zope.org\n\n2007/06/19 0.1.0a1\n==================\n\n- added zodb to dependencies\n\n- added support for fieldproperties\n\n\nDownload\n**********************",
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        "keywords": "persistent zope zope3",
        "license": "ZPL 2.1",
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        "name": "lovely.persistent",
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