OpenStack Orchestration (Heat)
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# 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.
import six
def exact_filter(query, model, filters):
"""Applies exact match filtering to a query.
Returns the updated query. Modifies filters argument to remove
filters consumed.
:param query: query to apply filters to
:param model: model object the query applies to, for IN-style
:param filters: dictionary of filters; values that are lists,
tuples, sets, or frozensets cause an 'IN' test to
be performed, while exact matching ('==' operator)
is used for other values
filter_dict = {}
if filters is None:
filters = {}
for key, value in six.iteritems(filters):
if isinstance(value, (list, tuple, set, frozenset)):
column_attr = getattr(model, key)
query = query.filter(column_attr.in_(value))
filter_dict[key] = value
if filter_dict:
query = query.filter_by(**filter_dict)
return query