Make a few database performance optimisations

entries/migrations/0004_auto_20171027_0846.py

@@ -0,0 +1,27 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.11.6 on 2017-10-26 21:46
+from __future__ import unicode_literals
+
+from django.conf import settings
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('entries', '0003_remove_entry_summary'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='entry',
+            name='author',
+            field=models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='entries', to=settings.AUTH_USER_MODEL),
+        ),
+        migrations.AlterField(
+            model_name='entry',
+            name='kind',
+            field=models.CharField(choices=[('note', 'note'), ('article', 'article')], db_index=True, default='note', max_length=30),
+        ),
+    ]

entries/models.py

@@ -10,17 +10,29 @@ from . import kinds
 ENTRY_KINDS = [(k.id, k.id) for k in kinds.all]
 
 
+class EntryManager(models.Manager):
+    def get_queryset(self):
+        qs = super(EntryManager, self).get_queryset()
+        return qs.select_related('author').prefetch_related('syndications')
+
+
 class Entry(ModelMeta, models.Model):
+    objects = EntryManager()
     kind = models.CharField(
         max_length=30,
         choices=ENTRY_KINDS,
+        db_index=True,
         default=ENTRY_KINDS[0][0]
     )
 
     name = models.CharField(max_length=100, blank=True)
     content = models.TextField()
 
-    author = models.ForeignKey(get_user_model(), on_delete=models.CASCADE)
+    author = models.ForeignKey(
+        get_user_model(),
+        related_name='entries',
+        on_delete=models.CASCADE,
+    )
 
     published = models.DateTimeField()
     updated = models.DateTimeField()
@@ -70,7 +82,14 @@ class Entry(ModelMeta, models.Model):
         ordering = ['-published']
 
 
+class SyndicationManager(models.Manager):
+    def get_queryset(self):
+        qs = super(SyndicationManager, self).get_queryset()
+        return qs.select_related('profile__site')
+
+
 class Syndication(models.Model):
+    objects = SyndicationManager()
     entry = models.ForeignKey(
         Entry,
         related_name='syndications',