@staticmethod
def destroy_all_models_in_dict(target_dict):
    """ Method runs the prepare destruction method of models 
            which are assumed in list or tuple as values within a dict
        """
    if target_dict:
        for model_list in target_dict.values():
            if isinstance(model_list, (list, tuple)):
                for model in model_list:
                    model.prepare_destruction()
                    if model._parent:
                        model._parent = None
            else:
                raise Exception('wrong data in clipboard')
