Merge branch 'offer-subscription-count' of opi/coin into master

README.md

@@ -143,6 +143,8 @@ whose membership fee is about to expire or is already expired (1 month before,
 on the day of expiration, 1 month after, 2 months after, and 3 months after).
 You should run this command in a cron job every day.
 
+`python manage.py offer_subscriptions_count`: Returns subscription count grouped
+by offer type.
 
 Configuration
 =============

coin/offers/management/commands/offer_subscriptions_count.py

@@ -0,0 +1,23 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.core.management.base import BaseCommand, CommandError
+from django.db.models import Count
+
+from coin.offers.models import Offer, OfferSubscription
+
+
+BOLD_START = '\033[1m'
+BOLD_END = '\033[0m'
+
+class Command(BaseCommand):
+    help = "Return subscription count for each offer type"
+
+    def handle(self, *args, **options):
+        offers = Offer.objects\
+                      .annotate(num_subscribtions=Count('offersubscription'))\
+                      .order_by('name')
+        for offer in offers:
+            self.stdout.write("{offer} offer has {count} subscriber(s)".format(
+                offer=BOLD_START + offer.name + BOLD_END,
+                count=BOLD_START + str(offer.num_subscribtions) + BOLD_END))