def get_prep_value(self, value):
        if isinstance(value, basestring):
            return value

        if value == None:
            return None

        # instantiate the proper LDObject to dump it appropriately
        ld_object = LDObject.instantiate(value, datatype=self.type_hint)
        return ld_object.serialize()
Convert our JSON object to a string before we save
dataset/ETHPy150Open benadida/helios-server/helios/datatypes/djangofield.py/LDObjectField.get_prep_value