Replace reports CBV with FBV

src/purchase/urls.py

@@ -6,7 +6,7 @@ from purchase.views import (
     NewBasketView,
     UpdateBasketView,
 )
-from purchase.views.reports import ReportsView
+from purchase.views.reports import reports
 
 app_name = "purchase"
 urlpatterns = [
@@ -14,5 +14,5 @@ urlpatterns = [
     path("new/", NewBasketView.as_view(), name="new"),
     path("<int:pk>/update/", UpdateBasketView.as_view(), name="update"),
     path("<int:pk>/delete/", DeleteBasketView.as_view(), name="delete"),
-    path("reports/", ReportsView.as_view(), name="reports"),
+    path("reports/", reports, name="reports"),
 ]

src/purchase/views/reports.py

@@ -5,8 +5,9 @@ from zoneinfo import ZoneInfo
 import numpy as np
 from django.conf import settings
 from django.contrib import messages
+from django.contrib.auth.decorators import permission_required
+from django.template.response import TemplateResponse
 from django.utils.translation import gettext as _
-from django.views.generic import TemplateView
 from matplotlib import pyplot as plt
 from matplotlib import ticker
 from matplotlib.axes import Axes
@@ -15,37 +16,30 @@ from matplotlib.dates import AutoDateLocator, ConciseDateFormatter, HourLocator
 from matplotlib.figure import Figure
 
 from purchase.models import Basket, PaymentMethod, Product, ProductQuerySet
-from purchase.views.utils import ProtectedViewsMixin
 
 
-class ReportsView(ProtectedViewsMixin, TemplateView):
-    permission_required = ["purchase.view_basket"]
+@permission_required("purchase.view_basket")
+def reports(request):
     template_name = "purchase/reports.html"
-
-    def get_context_data(self, **kwargs):
-        context = super().get_context_data(**kwargs)
     baskets = list(Basket.objects.priced().order_by("created_at"))
     if not baskets:
-            messages.warning(self.request, _("No sale to report"))
-            return context
+        messages.warning(request, _("No sale to report"))
+        return TemplateResponse(request, template_name, {})
 
     dates = Basket.objects.values_list("created_at__date", flat=True).distinct()
     average_basket_by_day = {
         date: Basket.objects.by_date(date).average_basket() for date in dates
     }
-        turnover_by_day = {
-            date: Basket.objects.by_date(date).turnover() for date in dates
-        }
+    turnover_by_day = {date: Basket.objects.by_date(date).turnover() for date in dates}
 
     products = Product.objects.with_turnover().with_sold()
     (
         products_plot,
         products_sold_pie,
         products_turnover_pie,
-        ) = self.get_products_plots(products)
-        by_hour_plot = self.by_hour_plot(baskets)
-        context.update(
-            {
+    ) = get_products_plots(products)
+
+    context = {
         "turnover": Basket.objects.turnover(),
         "turnover_by_day": turnover_by_day,
         "average_basket": Basket.objects.average_basket(),
@@ -54,15 +48,15 @@ class ReportsView(ProtectedViewsMixin, TemplateView):
         "products_plot": products_plot,
         "products_sold_pie": products_sold_pie,
         "products_turnover_pie": products_turnover_pie,
-                "by_hour_plot": by_hour_plot,
+        "by_hour_plot": by_hour_plot(baskets),
         "payment_methods": PaymentMethod.objects.with_turnover().with_sold(),
         "no_payment_method": Basket.objects.no_payment_method().priced(),
     }
-        )
-        return context
+    return TemplateResponse(request, template_name, context)
 
-    def get_products_plots(self, products: ProductQuerySet):
-        labels, sold, turnover = self.get_products_data_for_plot(products)
+
+def get_products_plots(products: ProductQuerySet):
+    labels, sold, turnover = get_products_data_for_plot(products)
 
     x = np.arange(len(labels))
     width = 0.4
@@ -87,25 +81,26 @@ class ReportsView(ProtectedViewsMixin, TemplateView):
     ax2.tick_params(axis="y", labelcolor=color)
 
     fig.tight_layout()
-        img1 = self.get_image_from_fig(fig)
+    img1 = get_image_from_fig(fig)
 
     fig = plt.figure()
     fig.suptitle(_("# sold"))
     ax1 = fig.add_subplot()
     ax1.pie(sold, labels=labels, autopct="%d%%")
     fig.tight_layout()
-        img2 = self.get_image_from_fig(fig)
+    img2 = get_image_from_fig(fig)
 
     fig = plt.figure()
     fig.suptitle(_("Turnover by product"))
     ax1 = fig.add_subplot()
     ax1.pie(turnover, labels=labels, autopct="%d%%")
     fig.tight_layout()
-        img3 = self.get_image_from_fig(fig)
+    img3 = get_image_from_fig(fig)
 
     return img1, img2, img3
 
-    def get_products_data_for_plot(self, products):
+
+def get_products_data_for_plot(products):
     labels = []
     sold = []
     turnover = []
@@ -115,8 +110,9 @@ class ReportsView(ProtectedViewsMixin, TemplateView):
         turnover.append(product.turnover / 100)
     return labels, sold, turnover
 
-    def by_hour_plot(self, baskets):
-        labels, counts, turnovers = self.get_by_hour_data_for_plot(baskets)
+
+def by_hour_plot(baskets):
+    labels, counts, turnovers = get_by_hour_data_for_plot(baskets)
     hours_in_day = 24
     fig: Figure = plt.figure()
     fig.suptitle(_("Sales by hour"))
@@ -145,9 +141,10 @@ class ReportsView(ProtectedViewsMixin, TemplateView):
     ax2.yaxis.set_major_formatter(ticker.FormatStrFormatter("%.2f€"))
 
     fig.tight_layout()
-        return self.get_image_from_fig(fig)
+    return get_image_from_fig(fig)
 
-    def get_by_hour_data_for_plot(self, baskets):
+
+def get_by_hour_data_for_plot(baskets):
     current: datetime.datetime = baskets[0].created_at
     current = current.replace(minute=0, second=0, microsecond=0)
     end: datetime.datetime = baskets[-1].created_at
@@ -173,7 +170,8 @@ class ReportsView(ProtectedViewsMixin, TemplateView):
         current = end_slot
     return labels, counts, turnovers
 
-    def get_image_from_fig(self, fig):
+
+def get_image_from_fig(fig):
     image_data = StringIO()
     fig.savefig(image_data, format="svg")
     image_data.seek(0)