0e0898c3cf
* stages/*: Add SerializerModel as base model, implement serializer property * flows: add initial flow exporter and importer * policies/*: implement .serializer for all policies * root: fix missing dacite requirement
51 lines
1.4 KiB
Python
51 lines
1.4 KiB
Python
"""Generic models"""
|
|
from django.db import models
|
|
from model_utils.managers import InheritanceManager
|
|
from rest_framework.serializers import BaseSerializer
|
|
|
|
|
|
class SerializerModel(models.Model):
|
|
"""Base Abstract Model which has a serializer"""
|
|
|
|
@property
|
|
def serializer(self) -> BaseSerializer:
|
|
"""Get serializer for this model"""
|
|
raise NotImplementedError
|
|
|
|
class Meta:
|
|
abstract = True
|
|
|
|
|
|
class CreatedUpdatedModel(models.Model):
|
|
"""Base Abstract Model to save created and update"""
|
|
|
|
created = models.DateTimeField(auto_now_add=True)
|
|
last_updated = models.DateTimeField(auto_now=True)
|
|
|
|
class Meta:
|
|
abstract = True
|
|
|
|
|
|
class InheritanceAutoManager(InheritanceManager):
|
|
"""Object manager which automatically selects the subclass"""
|
|
|
|
def get_queryset(self):
|
|
return super().get_queryset().select_subclasses()
|
|
|
|
|
|
class InheritanceForwardManyToOneDescriptor(
|
|
models.fields.related.ForwardManyToOneDescriptor
|
|
):
|
|
"""Forward ManyToOne Descriptor that selects subclass. Requires InheritanceAutoManager."""
|
|
|
|
def get_queryset(self, **hints):
|
|
return self.field.remote_field.model.objects.db_manager(
|
|
hints=hints
|
|
).select_subclasses()
|
|
|
|
|
|
class InheritanceForeignKey(models.ForeignKey):
|
|
"""Custom ForeignKey that uses InheritanceForwardManyToOneDescriptor"""
|
|
|
|
forward_related_accessor_class = InheritanceForwardManyToOneDescriptor
|