Django Model JsonHandler

JsonHandler.py

class JsonHandler(object):
    """
    Handles serialization/deserialization of attributes in the JSON blob.
    
    Requires a field of type TextField named 'blob' on the source model.
    
    These are not searchable unless you do FTS on the obj.blob field!
    """
    def __init__(self, node, *args, **kwargs):
        # Must set via dict interface or else it triggers __setattr__
        # which obviously doesn't work with these parameters
        self.__dict__['obj'] = node
        
    def __getattr__(self, attr, *args, **kwargs):
        # Deserialize the JSON object
        dic = json.loads(self.obj.blob)
        
        # Return the attribute requested
        return dic.get(attr, None)
        
    def __setattr__(self, key, value, *args, **kwargs):
        # Deserialize the JSON object
        dic = json.loads(self.obj.blob)
        
        # Store the data
        dic[key] = value
        
        # Serialize the dictionary
        self.obj.blob = json.dumps(dic, indent=4)
        
    def update(self, d, *args, **kwargs):
        # Deserialize the JSON object
        dic = json.loads(self.obj.blob)
        
        # Store the data
        dic.update(**d)
        
        # Serialize the dictionary
        self.obj.blob = json.dumps(dic, indent=4)