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Python object model built on JSON schema and JSON patch.

Project description

Warlock — self-validating Python objects using JSON schema

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Installation

Warlock is available on PyPI:

pip install warlock

Usage

  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 to track changes

    >>> sweden.population=9453000
    >>> sweden.patch
    '[{"path": "/population", "value": 9453000, "op": "add"}]'
    

Project details


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