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        "author": "Suriya Subramanian",
        "author_email": "suriya@alumni.cs.utexas.edu",
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            "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",
            "Programming Language :: Python :: 3",
            "Programming Language :: Python :: 3.5",
            "Topic :: Internet :: WWW/HTTP",
            "Topic :: Internet :: WWW/HTTP :: Dynamic Content"
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        "description": "================\ndjango-xvalidate\n================\n\n.. image:: https://travis-ci.org/suriya/django-xvalidate.svg?branch=master\n    :target: https://travis-ci.org/suriya/django-xvalidate\n.. image:: https://coveralls.io/repos/suriya/django-xvalidate/badge.svg?branch=master&service=github\n  :target: https://coveralls.io/github/suriya/django-xvalidate?branch=master\n.. image:: https://img.shields.io/pypi/v/django-xvalidate.svg\n    :target: https://pypi.python.org/pypi/django-xvalidate\n    :alt: Latest PyPI version\n\ndjango-xvalidate allows you to declare cross-field validators within a\nDjango model.\n\nAs an example, consider a Django model named :code:`Event`.\n\n.. code:: python\n\n  from django.db import models\n\n  class Event(models.Model):\n      title = models.CharField(max_length=255)\n      start_date = models.DateField()\n      end_date = models.DateField()\n\ndjango-xvalidate allows you to declare that the start date precedes the end\ndate as follows:\n\n.. code:: python\n\n  from django.db import models\n  from xvalidate import XValidatedModel, XLe\n\n  class Event(XValidatedModel, models.Model):\n      title = models.CharField(max_length=255)\n      start_date = models.DateField()\n      end_date = models.DateField()\n\n      class XVMeta(XValidatedModel.XVMeta):\n          spec = [\n              XLe('start_date', 'end_date').message(\n                  'The start date should precede the end date')\n          ]\n\n:code:`XValidatedModel` ensures that this specification is maintained\ninvoking :code:`Event.clean()` and raises :code:`ValidationError` as\nappropriate.\n\nWhy use django-xvalidate?\n-------------------------\ndjango-xvalidate allows you to specify how to validate your model instances\nin a more declarative manner than writing imperative code within your\n:code:`clean()` methods. Without django-xvalidate you would have to\nimplement the above example as\n\n.. code:: python\n\n    def clean(self):\n        super(Event, self).clean()\n        if (self.start_date is not None) and (self.end_date is not None):\n            if (self.end_date < self.start_date):\n                raise ValidationError('The start date should precede the end date')\n\nWith a more declarative format we have the option at some point in the\nfuture to automate the creation of test data that passes (or fails)\nvalidation.\n\ndjango-xvalidate comes some operator overloading that brings syntactic\nsugar to your declarations making them very easy to read. For instance,\nyou could specify:\n\n.. code:: python\n\n    ((XF('end_date') - 'start_date') > datetime.timedelta(days=4)).message(\n        'Event should last at least 5 days'\n    )\n\ndjango-xvalidate also allows the use of Django's double-underscore (`__`)\nsyntax to dereference related objects, enabling succinct definitions such\nas the following\n\n.. code:: python\n\n    (XF('registration_date') <= 'event__end_date').message(\n        'Must register before the event ends')",
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        "license": "MIT License",
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