Don't fav things multiple times

Fixes #28

fedireads/migrations/0002_auto_20200219_0816.py

@@ -1,4 +1,4 @@
-# Generated by Django 3.0.3 on 2020-02-19 08:04
+# Generated by Django 3.0.3 on 2020-02-19 08:16
 
 from django.conf import settings
 from django.db import migrations, models
@@ -22,7 +22,7 @@ class Migration(migrations.Migration):
                 ('user', models.ForeignKey(on_delete=django.db.models.deletion.PROTECT, to=settings.AUTH_USER_MODEL)),
             ],
             options={
-                'abstract': False,
+                'unique_together': {('user', 'status')},
             },
         ),
         migrations.AddField(

fedireads/models/activity.py

@@ -50,3 +50,7 @@ class Favorite(FedireadsModel):
     ''' fav'ing a post '''
     user = models.ForeignKey('User', on_delete=models.PROTECT)
     status = models.ForeignKey('Status', on_delete=models.PROTECT)
+
+    class Meta:
+        unique_together = ('user', 'status')
+

fedireads/outgoing.py

@@ -1,4 +1,5 @@
 ''' handles all the activity coming out of the server '''
+from django.db import IntegrityError
 from django.http import HttpResponseNotFound, JsonResponse
 from django.views.decorators.csrf import csrf_exempt
 import requests
@@ -172,10 +173,15 @@ def handle_comment(user, review, content):
 
 def handle_outgoing_favorite(user, status):
     ''' a user likes a status '''
+    try:
         favorite = models.Favorite.objects.create(
             status=status,
             user=user
         )
+    except IntegrityError:
+        # you already fav'ed that
+        return
+
     fav_activity = activitypub.get_favorite(favorite)
     recipients = get_recipients(user, 'direct', [status.user])
     broadcast(user, fav_activity, recipients)

fedireads/templates/feed.html

@@ -67,6 +67,11 @@
                 <p>{{ activity.content | safe }}</p>
             </div>
             <div class="interaction">
+                {% if activity.favorites.all %}
+                <span>
+                {{ activity.favorites.count }} like(s)
+                </span>
+                {% endif %}
                 <form name="favorite" action="/favorite/{{ activity.id }}" method="post">
                     {% csrf_token %}
                     <button>⭐️ Like</button>