Moves product stat view logic to serializer

- Split frontend into multiple files
- Bump frontend deps
- Remove unused stuff

main/api/serializers.py

@@ -1,7 +1,41 @@
-from main.models import Product
+from django.db.models import Sum
+from rest_framework import serializers
 from rest_framework.serializers import ModelSerializer
 
+from main.models import Product, OrderLine
+
 
 class ProductSerializer(ModelSerializer):
     class Meta:
         model = Product
+
+
+class ProductStatSerializer(ModelSerializer):
+    EXTERNAL_USER = 'Ekstern'
+    counts = serializers.SerializerMethodField()
+
+    def _format_counts(self, per_user):
+        per_user = list(per_user)
+        for row in per_user:
+            first = row.pop('order__customer__first_name')
+            last = row.pop('order__customer__last_name')
+            if first is None:
+                who = self.EXTERNAL_USER
+            else:
+                who = '{} {}'.format(first, last)
+            row['full_name'] = who
+
+        return per_user
+
+    def get_counts(self, obj):
+        per_user = OrderLine.objects\
+            .filter(product=obj)\
+            .values('order__customer__first_name', 'order__customer__last_name')\
+            .annotate(amount_total=Sum('amount'))\
+            .order_by('-amount_total')
+
+        return self._format_counts(per_user)
+
+    class Meta:
+        model = Product
+        fields = ['id', 'name', 'description', 'image', 'inventory_amount', 'active', 'created', 'counts']