Add missing indexes on forum_conversation models

machina/apps/forum_conversation/abstract_models.py

@@ -24,7 +24,7 @@
 ApprovedManager = get_class('forum_conversation.managers', 'ApprovedManager')
 
 
-class AbstractTopic(DatedModel):
+class AbstractTopic(models.Model):
     """ Represents a forum topic. """
 
     forum = models.ForeignKey(
@@ -77,7 +77,12 @@ class AbstractTopic(DatedModel):
     )
 
     # The date of the latest post.
-    last_post_on = models.DateTimeField(blank=True, null=True, verbose_name=_('Last post added on'))
+    last_post_on = models.DateTimeField(
+        blank=True,
+        null=True,
+        db_index=True,
+        verbose_name=_('Last post added on')
+    )
 
     # The first post and the last post of the topic. The first post can be unnaproved. The last post
     # must be approved.
@@ -96,12 +101,24 @@ class AbstractTopic(DatedModel):
         verbose_name=_('Subscribers'),
     )
 
+    created = models.DateTimeField(
+        auto_now_add=True,
+        db_index=True,
+        verbose_name=_('Creation date')
+    )
+    updated = models.DateTimeField(
+        auto_now=True,
+        db_index=True,
+        verbose_name=_('Update date')
+    )
+
     objects = models.Manager()
     approved_objects = ApprovedManager()
 
     class Meta:
         abstract = True
         app_label = 'forum_conversation'
+        indexes = [models.Index(fields=['type', 'last_post_on']), ]
         ordering = ['-type', '-last_post_on', ]
         get_latest_by = 'last_post_on'
         verbose_name = _('Topic')

machina/apps/forum_conversation/migrations/0013_auto_20201220_1745.py

@@ -0,0 +1,32 @@
+# Generated by Django 3.1.2 on 2020-12-20 22:45
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('forum_conversation', '0012_auto_20200423_1049'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='topic',
+            name='created',
+            field=models.DateTimeField(auto_now_add=True, db_index=True, verbose_name='Creation date'),
+        ),
+        migrations.AlterField(
+            model_name='topic',
+            name='last_post_on',
+            field=models.DateTimeField(blank=True, db_index=True, null=True, verbose_name='Last post added on'),
+        ),
+        migrations.AlterField(
+            model_name='topic',
+            name='updated',
+            field=models.DateTimeField(auto_now=True, db_index=True, verbose_name='Update date'),
+        ),
+        migrations.AddIndex(
+            model_name='topic',
+            index=models.Index(fields=['type', 'last_post_on'], name='forum_conve_type_cc96d0_idx'),
+        ),
+    ]