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    "info": {
        "author": "Robert Kajic",
        "author_email": "robert@kajic.com",
        "bugtrack_url": null,
        "classifiers": [
            "Environment :: Web Environment",
            "Framework :: Django",
            "Intended Audience :: Developers",
            "License :: OSI Approved :: MIT License",
            "Operating System :: OS Independent",
            "Programming Language :: Python",
            "Programming Language :: Python :: 2",
            "Programming Language :: Python :: 2.7",
            "Topic :: Internet :: WWW/HTTP",
            "Topic :: Internet :: WWW/HTTP :: Dynamic Content"
        ],
        "description": "====================\ndjango-model-changes\n====================\n\ndjango-model-changes allows you to track the state and changes of a model instance:\n\nQuick start\n-----------\n\n1. Install django-model-changes::\n\n    pip install django-model-changes\n\n2. Add \"django_model_changes\" to your INSTALLED_APPS setting like this::\n\n    INSTALLED_APPS = (\n        ...\n        'django_model_changes',\n    )\n\n3. Add the `ChangesMixin` to your model::\n\n    >>> from django.db import models\n    >>> from django_model_changes import ChangesMixin\n\n    >>> class User(ChangesMixin, models.Model):\n    >>>     name = models.CharField(max_length=100)\n\n4. Get instance changes::\n\n    >>> user = User()\n    >>> user.name = 'Foo Bar'\n    >>> user.save()\n\n    >>> user.name 'I got a new name'\n\n    >>> # Get current state\n    >>> user.current_state()\n    {'id': 1, 'name': 'I got a new name'}\n\n    >>> # Get previous state (state after previous save/create/delete)\n    >>> user.previous_state()\n    {'id': 1, 'name': 'Foo Bar'}\n\n    >>> # Get old state (state before previous save/create/delete)\n    >>> user.old_state()\n    {'id': None, 'name': ''}\n\n    >>> # Get changes from the previous state to the current state\n    >>> user.changes()\n    {'name': ('Foo Bar', 'I got a new name')}\n\n    >>> # Get changes from the old state to the current state\n    >>> user.old_changes()\n    {'id': (None, 1), 'name': ('', 'Foo Bar')}\n\n    >>> # Check if the instance was persisted (saved)\n    >>> user.was_persisted()\n    False\n\n    >>> # Check if the instance is persisted\n    >>> user.is_persisted()\n    True\n\n5. Listen for changes::\n        \n   >>> from django_model_changes import post_change\n    \n   >>> def my_callback(sender, instance, **kwargs):\n   >>>     # Do something with previous and current state\n   >>>     instance.old_state()\n   >>>     instance.current_state()\n\n   >>>     # There is also a convenience method to get\n   >>>     # an instance from the previous state\n   >>>     instance.old_instance()\n\n   >>> post_change.connect(my_callback, User)\n\nOverview\n--------\n\ndjango-model-changes allows you to retrieve the following states from an\ninstance:\n\n1. current_state()\n    The current state of the instance.\n2. previous_state()\n    The state of the instance **after** it was created, saved or deleted the\n    last time.\n3. old_state()\n    The previous previous_state(), i.e. the state of the instance **before**\n    it was created, saved or deleted the last time.\n\nIt also provides convenience methods to get changes between states:\n\n1. changes()\n    Changes from previous_state to current_state.\n2. previous_changes()\n    Changes from old_state to previous_state.\n3. old_changes()\n    Changes from old_state to current_state.\n\nAnd the following methods to determine if an instance was/is persisted in\nthe database:\n\n1. was_persisted()\n    Was the instance persisted in its old state.\n2. is_persisted()\n    Is the instance is_persisted in its current state.\n\nThis schematic tries to illustrate how these methods relate to each other::\n\n\n    after create/save/delete            after save/delete                  now\n    |                                   |                                  |\n    .-----------------------------------.----------------------------------.\n    |\\                                  |\\                                 |\\\n    | \\                                 | \\                                | \\\n    |  old_state()                      |  previous_state()                |  current_state()\n    |                                   |                                  |\n    |-----------------------------------|----------------------------------|\n    |  previous_changes() (prev - old)  |  changes() (cur - prev)          |\n    |-----------------------------------|----------------------------------|\n    |                      old_changes()  (cur - old)                      |\n    .----------------------------------------------------------------------.\n     \\                                                                      \\\n      \\                                                                      \\\n       was_persisted()                                                        is_persisted()\n\n\nDocumentation\n-------------\n\nRefer to the doc strings in `changes.py`_, or build the documentation::\n\n    >>> pip install Sphinx\n    >>> cd docs\n    >>> make html\n    Open build/html/index.html\n\n.. _changes.py: django_model_changes/changes.py",
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