Add category plot on history pages

nummi/statement/views.py

@@ -1,5 +1,5 @@
 from account.models import Account
-from django.db import models
+from category.utils import get_categories
 from django.shortcuts import get_object_or_404
 from django.urls import reverse_lazy
 from main.views import NummiCreateView, NummiDeleteView, NummiListView, NummiUpdateView
@@ -43,24 +43,7 @@ class StatementUpdateView(NummiUpdateView):
 
         _transactions = statement.transaction_set.all()
         if _transactions:
-            _categories = (
-                _transactions.values("category", "category__name", "category__icon")
-                .annotate(
-                    sum=models.Sum("value"),
-                    sum_m=models.Sum("value", filter=models.Q(value__lt=0)),
-                    sum_p=models.Sum("value", filter=models.Q(value__gt=0)),
-                )
-                .order_by("-sum")
-            )
-            data["categories"] = {
-                "data": _categories,
-                "max": max(
-                    _categories.aggregate(
-                        max=models.Max("sum_p", default=0),
-                        min=models.Min("sum_m", default=0),
-                    ).values(),
-                ),
-            }
+            data["categories"] = get_categories(_transactions)
 
         return data | {
             "account": statement.account,