Github user mxmrlv commented on a diff in the pull request:
https://github.com/apache/incubator-ariatosca/pull/72#discussion_r104313124
--- Diff: aria/modeling/bases.py ---
@@ -0,0 +1,405 @@
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements. See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You 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
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# 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.
+
+"""
+ARIA's storage.structures module
+Path: aria.storage.structures
+
+models module holds ARIA's models.
+
+classes:
+ * ModelMixin - abstract model implementation.
+ * ModelIDMixin - abstract model implementation with IDs.
+"""
+
+from sqlalchemy.orm import relationship, backref
+from sqlalchemy.orm.collections import attribute_mapped_collection
+from sqlalchemy.ext import associationproxy
+from sqlalchemy import (
+ Column,
+ ForeignKey,
+ Integer,
+ Text,
+ Table,
+)
+
+from . import utils
+from ..utils import formatting
+
+
+class ModelMixin(object):
+
+ @utils.classproperty
+ def __modelname__(cls):
# pylint: disable=no-self-argument
+ return getattr(cls, '__mapiname__', cls.__tablename__)
+
+ @classmethod
+ def id_column_name(cls):
+ raise NotImplementedError
+
+ @classmethod
+ def name_column_name(cls):
+ raise NotImplementedError
+
+ @classmethod
+ def foreign_key(cls, parent_table, nullable=False):
+ """
+ Return a ForeignKey object.
+
+ :param parent_table: Parent table name
+ :param nullable: Should the column be allowed to remain empty
+ """
+ return Column(Integer,
+ ForeignKey('{table}.id'.format(table=parent_table),
+ ondelete='CASCADE'),
+ nullable=nullable)
+
+ @classmethod
+ def relationship_to_self(cls,
+ column_name,
+ relationship_kwargs=None):
+ relationship_kwargs = relationship_kwargs or {}
+
+ remote_side = '{cls}.{remote_column}'.format(
+ cls=cls.__name__,
+ remote_column=cls.id_column_name()
+ )
+
+ primaryjoin = '{remote_side} == {cls}.{column}'.format(
+ remote_side=remote_side,
+ cls=cls.__name__,
+ column=column_name
+ )
+
+ return relationship(
+ cls._get_cls_by_tablename(cls.__tablename__).__name__,
+ primaryjoin=primaryjoin,
+ remote_side=remote_side,
+ post_update=True,
+ **relationship_kwargs
+ )
+
+ @classmethod
+ def one_to_many_relationship_to_self(cls,
--- End diff --
This one is only used in the type hierarchy structure. Maybe it'd be better
not to expose this method (just implement that logic only in `TypeBase`).
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