Add unique URI to Searchable that won't change if the event name changes

events/migrations/0014_add_searchable_uri.py

@@ -0,0 +1,18 @@
+# Generated by Django 2.0 on 2018-03-07 17:37
+
+from django.db import migrations, models
+import pytz
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('events', '0013_auto_20180304_1649'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='searchable',
+            name='event_uri',
+            field=models.CharField(max_length=256, null=True, serialize=False),
+        ),
+    ]

events/migrations/0015_populate_searchable_uri.py

@@ -0,0 +1,26 @@
+# Generated by Django 2.0 on 2018-03-11 06:32
+
+from django.db import migrations
+import hashlib
+
+def gen_event_uris(apps, schema_editor):
+    Event = MyModel = apps.get_model('events', 'Event')
+    Searchable = MyModel = apps.get_model('events', 'Searchable')
+    for searchable in Searchable.objects.all():
+        md5 = hashlib.md5()
+        federation_url = searchable.event_url.split('/')
+        federation_node = '/'.join(federation_url[:3])
+        federation_id = '/'.join(federation_url[:5])
+        md5.update(bytes(federation_id, 'utf8'))
+        searchable.event_uri = federation_node + '/' + md5.hexdigest()
+        searchable.save()
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('events', '0014_add_searchable_uri'),
+    ]
+
+    operations = [
+        migrations.RunPython(gen_event_uris, reverse_code=migrations.RunPython.noop)
+    ]

events/migrations/0016_make_searchable_uri_unique.py

@@ -0,0 +1,23 @@
+# Generated by Django 2.0 on 2018-03-11 06:33
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('events', '0015_populate_searchable_uri'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='searchable',
+            name='event_uri',
+            field=models.CharField(max_length=256, primary_key=True, serialize=False),
+        ),
+        migrations.AlterField(
+            model_name='searchable',
+            name='event_url',
+            field=models.URLField(),
+        ),
+    ]

events/models/events.py

@@ -14,6 +14,7 @@ import re
 import pytz
 import datetime
 import unicodedata
+import hashlib
 
 SLUG_OK = '-_~'
 
@@ -92,14 +93,24 @@ def update_event_searchable(event):
     site = Site.objects.get(id=1)
     event_url = "https://%s%s" % (site.domain, event.get_absolute_url())
     origin_url = "https://%s%s" % (site.domain, reverse('searchables'))
+
+    md5 = hashlib.md5()
+    federation_url = event_url.split('/')
+    federation_node = '/'.join(federation_url[:3])
+    federation_id = '/'.join(federation_url[:5])
+    md5.update(bytes(federation_id, 'utf8'))
+    event_uri = federation_node + '/' + md5.hexdigest()
+
     try:
-        searchable = Searchable.objects.get(event_url=event_url)
+        searchable = Searchable.objects.get(event_uri=event_uri)
     except:
-        searchable = Searchable(event_url)
+        searchable = Searchable(event_uri)
         searchable.origin_node = origin_url
         searchable.federation_node = origin_url
         searchable.federation_time = datetime.datetime.now()
 
+    searchable.event_url = event_url
+
     if event.team.category:
         searchable.img_url = event.team.category.img_url
     else:

events/models/search.py

@@ -6,7 +6,8 @@ import datetime
 
 # Provides a searchable index of events that may belong to this site or a federated site
 class Searchable(models.Model):
-    event_url = models.URLField(primary_key=True, null=False, blank=False)
+    event_uri = models.CharField(primary_key=True, max_length=256, null=False, blank=False)
+    event_url = models.URLField(null=False, blank=False)
     event_title = models.CharField(max_length=256, null=False, blank=False)
     img_url = models.URLField(null=False, blank=False)
     location_name = models.CharField(max_length=256, null=False, blank=False)