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Vendor_App/admin.py

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+from django.contrib import admin
+from .models import *
+
+# Register your models here.
+admin.site.register(Vendor)
+admin.site.register(PurchaseOrder)
+admin.site.register(HistoricalPerformance)

Vendor_App/apps.py

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+from django.apps import AppConfig
+
+
+class Vendormanagement2Config(AppConfig):
+ default_auto_field = 'django.db.models.BigAutoField'
+ name = 'VendorApp'

Vendor_App/models.py

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+from django.db import models
+from django.db.models.signals import post_save
+from django.dispatch import receiver
+from django.db.models import Count, Avg
+# vendor_app/models.py
+from django.db import models
+
+class Vendor(models.Model):
+ name = models.CharField(max_length=255)
+ contact_details = models.TextField()
+ address = models.TextField()
+ vendor_code = models.CharField(max_length=50, unique=True, primary_key=True)
+ on_time_delivery_rate = models.FloatField(default=0)
+ quality_rating_avg = models.FloatField(default=0)
+ average_response_time = models.FloatField(default=0)
+ fulfillment_rate = models.FloatField(default=0)
+
+ def __str__(self):
+ return self.name
+
+class PurchaseOrder(models.Model):
+ po_number = models.CharField(max_length=50, unique=True, primary_key=True)
+ vendor = models.ForeignKey(Vendor, on_delete=models.CASCADE)
+ order_date = models.DateTimeField()
+ delivery_date = models.DateTimeField(null=True, blank=True)
+ items = models.JSONField()
+ # quantity = models.PositiveIntegerField()
+ status = models.CharField(max_length=20)
+ quality_rating = models.FloatField(null=True, blank=True)
+ issue_date = models.DateTimeField()
+ acknowledgment_date = models.DateTimeField(null=True, blank=True)
+
+ def __str__(self):
+ return self.po_number
+
+class HistoricalPerformance(models.Model):
+ vendor = models.ForeignKey(Vendor, on_delete=models.CASCADE)
+ date = models.DateTimeField()
+ on_time_delivery_rate = models.FloatField()
+ quality_rating_avg = models.FloatField()
+ average_response_time = models.FloatField()
+ fulfillment_rate = models.FloatField()
+
+@receiver(post_save, sender=PurchaseOrder)
+def update_vendor_performance(sender, instance, **kwargs):
+ if instance.status == 'completed':
+ # Update On-Time Delivery Rate
+ completed_orders = PurchaseOrder.objects.filter(vendor=instance.vendor, status='completed')
+ on_time_delivery_rate = completed_orders.filter(delivery_date__lte=instance.delivery_date).count() / completed_orders.count()
+ instance.vendor.on_time_delivery_rate = on_time_delivery_rate if on_time_delivery_rate else 0
+
+ # Update Quality Rating Average
+ completed_orders_with_rating = completed_orders.exclude(quality_rating__isnull=True)
+ quality_rating_avg = completed_orders_with_rating.aggregate(Avg('quality_rating'))['quality_rating__avg'] or 0
+ instance.vendor.quality_rating_avg = quality_rating_avg if quality_rating_avg else 0
+
+ instance.vendor.save()
+
+@receiver(post_save, sender=PurchaseOrder)
+def update_response_time(sender, instance, **kwargs):
+ if instance.acknowledgment_date:
+ # Update Average Response Time
+ response_times = PurchaseOrder.objects.filter(vendor=instance.vendor, acknowledgment_date__isnull=False).values_list('acknowledgment_date', 'issue_date')
+ average_response_time = sum((ack_date - issue_date).total_seconds() for ack_date, issue_date in response_times) / len(response_times)
+ instance.vendor.average_response_time = average_response_time
+ instance.vendor.save()
+
+@receiver(post_save, sender=PurchaseOrder)
+def update_fulfillment_rate(sender, instance, **kwargs):
+ # Update Fulfillment Rate
+ fulfilled_orders = PurchaseOrder.objects.filter(vendor=instance.vendor, status='completed', quality_rating__isnull=False)
+ fulfillment_rate = fulfilled_orders.count() / PurchaseOrder.objects.filter(vendor=instance.vendor).count()
+ instance.vendor.fulfillment_rate = fulfillment_rate
+ instance.vendor.save()
+
+

Vendor_App/serializers.py

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+# vendor_app/serializers.py
+from rest_framework import serializers
+from .models import Vendor, PurchaseOrder
+
+class VendorSerializer(serializers.ModelSerializer):
+ class Meta:
+ model = Vendor
+ fields = '__all__'
+
+class PurchaseOrderSerializer(serializers.ModelSerializer):
+ class Meta:
+ model = PurchaseOrder
+ fields = '__all__'

Vendor_App/tests.py

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+from django.test import TestCase
+
+# Create your tests here.

Vendor_App/urls.py

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+# vendor_app/urls.py
+from django.urls import path
+from .views import *
+
+urlpatterns = [
+ path('vendors/', VendorListCreateView.as_view(), name='vendor-list-create'),
+ path('vendors/<int:pk>/', VendorRetrieveUpdateDeleteView.as_view(), name='vendor-retrieve-update-delete'),
+ path('purchase_orders/', PurchaseOrderListCreateView.as_view(), name='purchase-order-list-create'),
+ path('purchase_orders/<int:pk>/', PurchaseOrderRetrieveUpdateDeleteView.as_view(), name='purchase-order-retrieve-update-delete'),
+ path('vendors/<int:pk>/performance/', VendorPerformanceView.as_view(), name='vendor-performance'),
+ path('purchase_orders/<int:pk>/acknowledge/', AcknowledgePurchaseOrderView.as_view(), name='acknowledge-purchase-order'),
+ # path('login/', obtain_auth_token_view, name='api_token_auth'),
+
+]

Vendor_App/views.py

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+from django.shortcuts import render
+from rest_framework import generics
+from rest_framework.generics import GenericAPIView
+from rest_framework.mixins import *
+from .models import *
+from .serializers import *
+from rest_framework.response import Response
+from django.utils import timezone
+from django.db.models import Avg
+from rest_framework.authentication import TokenAuthentication
+from rest_framework.permissions import IsAuthenticated
+
+
+class VendorListCreateView(generics.ListCreateAPIView):
+ authentication_classes = [TokenAuthentication]
+ permission_classes = [IsAuthenticated]
+ queryset = Vendor.objects.all()
+ serializer_class = VendorSerializer
+
+class VendorRetrieveUpdateDeleteView(generics.RetrieveUpdateDestroyAPIView):
+ authentication_classes = [TokenAuthentication]
+ permission_classes = [IsAuthenticated]
+ queryset = Vendor.objects.all()
+ serializer_class = VendorSerializer
+
+class PurchaseOrderListCreateView(generics.ListCreateAPIView):
+ authentication_classes = [TokenAuthentication]
+ permission_classes = [IsAuthenticated]
+ queryset = PurchaseOrder.objects.all()
+ serializer_class = PurchaseOrderSerializer
+
+class PurchaseOrderRetrieveUpdateDeleteView(generics.RetrieveUpdateDestroyAPIView):
+ authentication_classes = [TokenAuthentication]
+ permission_classes = [IsAuthenticated]
+ queryset = PurchaseOrder.objects.all()
+ serializer_class = PurchaseOrderSerializer
+
+class VendorPerformanceView(generics.RetrieveAPIView):
+ authentication_classes = [TokenAuthentication]
+ permission_classes = [IsAuthenticated]
+ queryset = Vendor.objects.all()
+ serializer_class = VendorSerializer
+
+ def retrieve(self, request, *args, **kwargs):
+ instance = self.get_object()
+ serializer = self.get_serializer(instance)
+ return Response({'on_time_delivery_rate': serializer.data['on_time_delivery_rate'],
+ 'quality_rating_avg': serializer.data['quality_rating_avg'],
+ 'average_response_time': serializer.data['average_response_time'],
+ 'fulfillment_rate': serializer.data['fulfillment_rate']})
+ # return Response(serializer.data['on_time_delivery_rate', 'quality_rating_avg', 'average_response_time', 'fulfillment_rate'])
+
+class AcknowledgePurchaseOrderView(generics.CreateAPIView):
+ authentication_classes = [TokenAuthentication]
+ permission_classes = [IsAuthenticated]
+ queryset = PurchaseOrder.objects.all()
+ serializer_class = PurchaseOrderSerializer
+
+ def create(self, request, *args, **kwargs):
+ instance = self.get_object()
+ instance.acknowledgment_date = request.data.get('acknowledgment_date') #timezone.now()
+ instance.save()
+ response_times = PurchaseOrder.objects.filter(vendor=instance.vendor, acknowledgment_date__isnull=False).values_list('acknowledgment_date', 'issue_date')
+ average_response_time = sum((ack_date - issue_date).total_seconds() for ack_date, issue_date in response_times) / len(response_times)
+ instance.vendor.average_response_time = average_response_time
+ instance.vendor.save()
+ return Response({'acknowledgment_date': instance.acknowledgment_date})