# Copyright 2020 Karlsruhe Institute of Technology
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from sqlalchemy.exc import IntegrityError
from sqlalchemy.orm.exc import StaleDataError
from .models import Tag
from kadi.lib.db import NestedTransaction
"""Mixin for SQLALchemy models to add support for tagging.
The model needs a many-to-many ``tags`` relationship connecting itself with the