forked from uncloud/uncloud
Implement non-destructive order updates
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3 changed files with 30 additions and 1 deletions
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@ -827,6 +827,7 @@ class Order(models.Model):
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editable=False)
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billing_address = models.ForeignKey(BillingAddress, on_delete=models.CASCADE)
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description = models.TextField()
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replaced_by = models.ForeignKey('self', on_delete=models.CASCADE, blank=True, null=True)
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# TODO: enforce ending_date - starting_date to be larger than recurring_period.
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creation_date = models.DateTimeField(auto_now_add=True)
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@ -71,7 +71,7 @@ class OrderSerializer(serializers.ModelSerializer):
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class Meta:
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model = Order
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fields = ['uuid', 'owner', 'description', 'creation_date', 'starting_date', 'ending_date',
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'bill', 'recurring_period', 'recurring_price', 'one_time_price']
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'bill', 'recurring_period', 'recurring_price', 'one_time_price', 'replaced_by']
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###
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@ -13,6 +13,7 @@ from hardcopy import bytestring_to_pdf
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from django.core.files.temp import NamedTemporaryFile
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from django.http import FileResponse
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from django.template.loader import render_to_string
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from copy import deepcopy
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import json
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import logging
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@ -304,6 +305,7 @@ class AdminBillViewSet(BillViewSet):
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class AdminOrderViewSet(mixins.ListModelMixin,
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mixins.RetrieveModelMixin,
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mixins.CreateModelMixin,
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mixins.UpdateModelMixin,
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viewsets.GenericViewSet):
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serializer_class = OrderSerializer
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permission_classes = [permissions.IsAdminUser]
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@ -314,6 +316,32 @@ class AdminOrderViewSet(mixins.ListModelMixin,
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def get_queryset(self):
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return Order.objects.all()
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# Updates create a new order and terminate the 'old' one.
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@transaction.atomic
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def update(self, request, *args, **kwargs):
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order = self.get_object()
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partial = kwargs.pop('partial', False)
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serializer = self.get_serializer(order, data=request.data, partial=partial)
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serializer.is_valid(raise_exception=True)
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# Clone existing order for replacement.
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replacing_order = deepcopy(order)
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# Yes, that's how you make a new entry in DB:
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# https://docs.djangoproject.com/en/3.0/topics/db/queries/#copying-model-instances
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replacing_order.pk = None
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for attr, value in serializer.validated_data.items():
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setattr(replacing_order, attr, value)
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# Save replacing order and terminate 'previous' one.
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replacing_order.save()
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order.replaced_by = replacing_order
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order.save()
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order.terminate()
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return Response(replacing_order)
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@action(detail=True, methods=['post'])
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def terminate(self, request, pk):
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order = self.get_object()
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