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# Warlock
[](https://travis-ci.org/bcwaldon/warlock)
Build self-validating python objects using JSON schemas.
1) Create your schema
>>> schema = {
'name': 'Country',
'properties': {
'name': {'type': 'string'},
'abbreviation': {'type': 'string'},
'population': {'type': 'integer'},
},
'additionalProperties': False,
}
2) Create a model
>>> import warlock
>>> Country = warlock.model_factory(schema)
3) Create an object using your model
>>> sweden = Country(name='Sweden', abbreviation='SE')
4) Let the object validate itself
>>> sweden.name = 5
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "warlock/core.py", line 53, in __setattr__
raise InvalidOperation(msg)
warlock.core.InvalidOperation: Unable to set 'name' to '5'
>>> sweden.overlord = 'Bears'
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "warlock/core.py", line 53, in __setattr__
raise InvalidOperation(msg)
warlock.core.InvalidOperation: Unable to set 'overlord' to 'Bears'
5) Generate a [JSON Patch document](http://tools.ietf.org/html/draft-ietf-appsawg-json-patch) to track changes
>>> sweden.population=9453000
>>> sweden.patch
'[{"path": "/population", "value": 9453000, "op": "add"}]'
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