Make chat faster

chat_box/migrations/0015_room_last_msg_time.py

@@ -0,0 +1,33 @@
+# Generated by Django 3.2.18 on 2023-11-02 01:41
+
+from django.db import migrations, models
+
+
+def migrate(apps, schema_editor):
+    Room = apps.get_model("chat_box", "Room")
+    Message = apps.get_model("chat_box", "Message")
+
+    for room in Room.objects.all():
+        messages = room.message_set
+        last_msg = messages.first()
+        if last_msg:
+            room.last_msg_time = last_msg.time
+            room.save()
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("chat_box", "0014_userroom_unread_count"),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name="room",
+            name="last_msg_time",
+            field=models.DateTimeField(
+                db_index=True, null=True, verbose_name="last seen"
+            ),
+        ),
+        migrations.RunPython(migrate, migrations.RunPython.noop, atomic=True),
+    ]