def instantiate_models_from_json(model_class, json)
      instantiate_models model_class, ResponseParser.parse(JSON.parse(json))
    end
def instantiate_models_from_json(model_class, json)
      instantiate_models model_class, ResponseParser.parse(JSON.parse(json))
    end
This method is the same as {#instantiate_models} but takes an unparsed JSON string as its input.

 @param [Class] model_class The top-level model class to create from `json`.
 @param [String] json The JSON string to parse.

 @return [nil, `model_class`] The resulting instantiated model.

 @private