def deserialize_json(stream, username):
"""
Given a stream containing JSON, deserializers the JSON into ConfigurationModel instances.
The stream is expected to be in the following format:
{ "model": "config_models.ExampleConfigurationModel",
"data":
[
{ "enabled": True,
"color": "black"
...
},
{ "enabled": False,
"color": "yellow"
...
},
...
]
}
If the provided stream does not contain valid JSON for the ConfigurationModel specified,
an Exception will be raised.
Arguments:
stream: The stream of JSON, as described above.
username: The username of the user making the change. This must match an existing user.
Returns: the number of created entries
"""
parsed_json = JSONParser().parse(stream)
serializer_class = get_serializer_class(apps.get_model(parsed_json["model"]))
list_serializer = serializer_class(data=parsed_json["data"], context={"changed_by_username": username}, many=True)
if list_serializer.is_valid():
model_class = serializer_class.Meta.model
for data in reversed(list_serializer.validated_data):
if model_class.equal_to_current(data):
list_serializer.validated_data.remove(data)
entries_created = len(list_serializer.validated_data)
list_serializer.save()
return entries_created
else:
raise Exception(list_serializer.error_messages)
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