Add email sending for getting off the waitlist

ochan1 · Apr 24, 2020 · 0356cef · 0356cef
1 parent 517f3de
commit 0356cef
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Showing 3 changed files with 54 additions and 8 deletions.
diff --git a/hknweb/events/models.py b/hknweb/events/models.py
@@ -50,13 +50,10 @@ def waitlist_set(self):
             return self.rsvp_set.none()
         return self.rsvp_set.order_by("created_at")[self.rsvp_limit:]
 
-    def check_newly_off_waitlist(self, old_admitted):
+    def newly_off_waitlist_rsvps(self, old_admitted):
         """ old_admitted must be a set, not a QuerySet. QuerySets are mutable views into the database. """
         new_admitted = set(self.admitted_set())
-        newly_off_waitlist = new_admitted - old_admitted
-        print("CHECKING OFF WAITLIST:", new_admitted, old_admitted, newly_off_waitlist)
-        for rsvp in newly_off_waitlist:
-            print("NEW USER:", rsvp.user.username)
+        return new_admitted - old_admitted
 
 
 class Rsvp(models.Model):

diff --git a/hknweb/events/templates/events/off_waitlist_email.html b/hknweb/events/templates/events/off_waitlist_email.html
@@ -0,0 +1,24 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <title>{{ subject }}</title>
+</head>
+<body>
+
+    <p>
+        You have gotten off the waitlist for the event {{ event_name }}!
+        Click
+        <a href="{{ event_link }}">here</a>
+        to view the event.
+    </p>
+
+    <p>
+        Have a nice day!
+    </p>
+
+    <img src="{{ img_link }}" alt="cute animal"><br>
+    <span style="font-size: 0.8em;"> Image source: pexels.com </span>
+
+</body>
+</html>
diff --git a/hknweb/events/views.py b/hknweb/events/views.py
@@ -1,10 +1,13 @@
 from django.shortcuts import render, redirect
 from django.http import Http404
 from django.contrib import messages
-from django.shortcuts import get_object_or_404
+from django.shortcuts import get_object_or_404, reverse
+from django.core.mail import EmailMultiAlternatives
+from django.conf import settings
+from django.template.loader import render_to_string
 from django.views import generic
 
-from hknweb.utils import login_and_permission, method_login_and_permission
+from hknweb.utils import login_and_permission, method_login_and_permission, get_rand_photo
 from .models import Event, EventType, Rsvp
 from .forms import EventForm
 
@@ -81,7 +84,8 @@ def unrsvp(request, id):
     else:
         old_admitted = set(event.admitted_set())
         rsvp.delete()
-        event.check_newly_off_waitlist(old_admitted)
+        for off_waitlist_rsvp in event.newly_off_waitlist_rsvps(old_admitted):
+            send_off_waitlist_email(request, off_waitlist_rsvp.user, event)
     return redirect(event)
 
 @login_and_permission('events.add_event')
@@ -112,3 +116,24 @@ def form_valid(self, form):
             messages.success(self.request, "People who rsvp'd or are on the waitlist are not notified"
                         " when you change the rsvp limit. Be sure to make an announcement!")
         return super().form_valid(form)
+
+# Helpers
+
+def send_off_waitlist_email(request, user, event):
+    subject = '[HKN] You have gotten off the waitlist for your event'
+
+    event_link = request.build_absolute_uri(
+            reverse("events:detail", kwargs={ 'id': event.id }))
+    html_content = render_to_string(
+        'events/off_waitlist_email.html',
+        {
+            'subject': subject,
+            'event_name': event.name,
+            'event_link': event_link,
+            'img_link': get_rand_photo(),
+        }
+    )
+    msg = EmailMultiAlternatives(subject, subject,
+                settings.NO_REPLY_EMAIL, [user.email])
+    msg.attach_alternative(html_content, "text/html")
+    msg.send()