mia-accounting-django/mia_core/models.py

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# The core application of the Mia project.
# by imacat <imacat@mail.imacat.idv.tw>, 2020/6/29
# Copyright (c) 2020 imacat.
#
# 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
#
# 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.
"""The data models of the Mia core application.
"""
from django.conf import settings
from django.db import models
from mia_core.utils import new_pk
class BaseModel(models.Model):
"""The common abstract base model that has id, created_at, created_by,
updated_at, and updated_by."""
id = models.PositiveIntegerField(primary_key=True)
created_at = models.DateTimeField(auto_now_add=True)
created_by = models.ForeignKey(
settings.AUTH_USER_MODEL, on_delete=models.PROTECT,
related_name="created_%(app_label)s_%(class)s")
updated_at = models.DateTimeField(auto_now=True)
updated_by = models.ForeignKey(
settings.AUTH_USER_MODEL, on_delete=models.PROTECT,
related_name="updated_%(app_label)s_%(class)s")
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
self.current_user = None
def save(self, force_insert=False, force_update=False, using=None,
update_fields=None):
if self.pk is None:
self.pk = new_pk(self.__class__)
if self.current_user is not None:
self.created_by = self.current_user
if self.current_user is not None:
self.updated_by = self.current_user
super().save(force_insert=force_insert, force_update=force_update,
using=using, update_fields=update_fields)
class Meta:
abstract = True