def get_template_func(instance):
    return None


def get_templ_ctx_func(instance):
    rv = dict()
    return rv


def get_func(model_view, uuid, serialized_args):
    """Should return a list of one element (or [None] if element is none) or None if you want default behaviour"""
    return None


def post_get_func(instance):
    return instance


def list_template_func(instances):
    return None


def list_templ_ctx_func(instances):
    rv = dict()
    return rv


def list_func(model_view, serialized_args):
    """Should return a list elements or None if you want default behaviour"""
    return None


def post_list_func(instances):
    return instances


def create_template_func():
    return None


def create_templ_ctx_func():
    rv = dict()
    return rv


def create_args_process_func(serialized_form):
    return serialized_form


def create_should_func(serialized_form):
    return True, ""


def create_post_add_func(instance):
    pass


def create_post_commit_func(instance):
    pass


def update_template_func(instance):
    return None


def update_templ_ctx_func(instance):
    rv = dict()
    return rv


def update_args_process_func(serialized_form):
    return serialized_form


def update_should_func(serialized_form):
    return True, ""


def update_post_add_func(instance):
    pass


def update_post_commit_func(instance):
    pass


def delete_template_func(instance):
    return None


def delete_templ_ctx_func(instance):
    rv = dict()
    return rv


def delete_args_process_func(serialized_form):
    return serialized_form


def delete_should_func(instance, serialized_form):
    return True, ""


def delete_post_delete_func(instance):
    pass


def delete_post_commit_func(instance):
    pass