Source code for cobra_component_models.orm.mixin.name_mixin
# Copyright (c) 2019, Moritz E. Beber.
#
# 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
#
# https://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.
"""Provide a component name mixin with the corresponding ORM columns."""
from sqlalchemy import Boolean, Column, ForeignKey, Integer, String
from sqlalchemy.ext.declarative import declared_attr
from sqlalchemy.orm import relationship
[docs]class NameMixin:
"""
Define a component name mixin.
Attributes
----------
name : str
A common name for a component.
is_preferred: bool, optional
Mark a component's name as being preferred.
namespace_id : int
The foreign key of the related Identifiers.org namespace.
"""
name: str = Column(String, nullable=False, index=True)
is_preferred: bool = Column(Boolean, default=False, nullable=False)
[docs] def __init__(self, *, is_preferred: bool = False, **kwargs) -> None:
"""Create an instance with a default value."""
super().__init__(**kwargs)
self.is_preferred = is_preferred
@declared_attr
def namespace_id(cls):
"""Defer the namespace id field instantiation."""
# Some names do not come from a specific namespace, e.g.,
# some compartment names are simply invented without source.
return Column(Integer, ForeignKey("namespaces.id"), nullable=True)
@declared_attr
def namespace(cls):
"""Defer the namespace field instantiation."""
return relationship("Namespace")