Add 'total sales monthly' reporting feature for treasurer

stregsystem/templates/admin/stregsystem/report/total_sales_monthly.html

@@ -0,0 +1,37 @@
+{% extends "admin/base_site.html" %}
+{% load static %}
+
+{% block title %}Total sales monthly{% endblock %}
+{% block breadcrumbs %}
+    <div class="breadcrumbs"><a href="../..">Hjem</a></div>{% endblock %}
+
+{% block content %}
+    {% load admin_static %}
+
+    <h1>Total sales monthly</h1>
+    <p>Table showing total registered sales during a given month in the past year. Useful for the treasurer for
+        bookkeeping.</p>
+    <table>
+        <thead>
+        <tr>
+            <th>Year</th>
+            <th>Month</th>
+            <th>DKK</th>
+        </tr>
+        </thead>
+        <tr></tr>
+        {% for m in total_sales_monthly %}
+            <tr>
+                <td>
+                    {{ m.0 }}
+                </td>
+                <td>
+                    {{ m.1 }}
+                </td>
+                <td>
+                    {{ m.2 }}
+                </td>
+            </tr>
+        {% endfor %}
+    </table>
+{% endblock %}

stregsystem/templates/shared_report_lists.html

@@ -25,6 +25,11 @@
             <td>&nbsp;</td>
             <td>&nbsp;</td>
         </tr>
+        <tr>
+            <th scope="row"><a href = "/admin/totalsales/">Total sales monthly</a></th>
+            <td>&nbsp;</td>
+            <td>&nbsp;</td>
+        </tr>
     </table>
 </div>
 

stregsystem/urls.py

@@ -22,6 +22,7 @@
     re_path(r'^$', views.roomindex, name="index"),
     re_path(r'^admin/batch/$', views.batch_payment, name="batch"),
     re_path(r'^admin/mobilepaytool/$', views.mobilepaytool, name="mobilepaytool"),
+    re_path(r'^admin/totalsales/$', views.total_sales_monthly, name="total_monthly_sales"),
     re_path(r'^(?P<room_id>\d+)/$', views.index, name="menu_index"),
     re_path(r'^(?P<room_id>\d+)/sale/$', views.sale, name="quickbuy"),
     re_path(r'^(?P<room_id>\d+)/sale/(?P<member_id>\d+)/$', views.menu_sale, name="menu"),

stregsystem/utils.py

@@ -97,6 +97,21 @@ def make_unprocessed_member_filled_mobilepayment_query():
         Q(payment__isnull=True) & Q(status=MobilePayment.UNSET) & Q(member__isnull=False))
 
 
+def total_sales_monthly_query(month_year_pair):
+    """
+    Generates list of tuples (year, month, sum of sales for that month) given an input list of tuples (month, year)
+    """
+    from django.db.models import Sum
+    from stregsystem.templatetags.stregsystem_extras import money
+    from stregsystem.models import Sale
+    import datetime
+
+    res = list()
+    for m, y in month_year_pair:
+        res.append((y, m, money(
+            Sale.objects.filter(timestamp__month=m, timestamp__year=y).aggregate(Sum('price'))['price__sum'])))
+    return res
+
 def date_to_midnight(date):
     """
     Converts a datetime.date to a datetime of the same date at midnight.

stregsystem/views.py

@@ -6,7 +6,7 @@
 from django.contrib.admin.views.decorators import staff_member_required
 from django.contrib.auth.decorators import permission_required
 from django.conf import settings
-from django.db.models import Q
+from django.db.models import Q, Sum
 from django import forms
 from django.http import HttpResponsePermanentRedirect, HttpResponseBadRequest
 from django.shortcuts import get_object_or_404, render
@@ -32,7 +32,8 @@
     qr_code,
     make_room_specific_query,
     make_unprocessed_mobilepayment_query,
-    parse_csv_and_create_mobile_payments
+    parse_csv_and_create_mobile_payments,
+    total_sales_monthly_query
 )
 
 from .booze import ballmer_peak
@@ -364,7 +365,7 @@ def mobilepaytool(request):
 
     return render(request, "admin/stregsystem/mobilepaytool.html", data)
 
-  
+
 def qr_payment(request):
     form = QRPaymentForm(request.GET)
     if not form.is_valid():
@@ -381,3 +382,19 @@ def qr_payment(request):
     data = 'mobilepay://send?{}'.format(urllib.parse.urlencode(query))
 
     return qr_code(data)
+
+
+@staff_member_required()
+def total_sales_monthly(request):
+    data = dict()
+
+    # generate pairs (month, year) from current month, going a year back
+    last_year = datetime.datetime.today().year - 1
+    current_month = datetime.datetime.today().month
+    months = [((m + current_month) % 12 + 1, last_year + (m + current_month) // 12) for m in range(0, 12)]
+
+    # for each month, year pair, sum all sales in that period, and convert numeric month to text
+    data['total_sales_monthly'] = [(y, datetime.date(1970, m, 1).strftime('%B'), p) for y, m, p in
+                                   total_sales_monthly_query(months)]
+
+    return render(request, "admin/stregsystem/report/total_sales_monthly.html", data)