Index the fix field

And chain querysets.

Signed-off-by: Philippe Ombredanne <pombredanne@nexb.com>

Author: pombredanne

vulnerabilities/migrations/0028_alter_packagerelatedvulnerability_fix.py

@@ -0,0 +1,18 @@
+# Generated by Django 4.0.7 on 2022-10-19 16:18
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('vulnerabilities', '0027_alter_vulnerabilityreference_url'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='packagerelatedvulnerability',
+            name='fix',
+            field=models.BooleanField(db_index=True, default=False, help_text='Does this relation fix the specified vulnerability ?'),
+        ),
+    ]

vulnerabilities/models.py

@@ -203,7 +203,7 @@ def vulnerable(self):
         """
         Return all vulnerable packages.
         """
-        return Package.objects.filter(packagerelatedvulnerability__fix=False).distinct()
+        return self.filter(packagerelatedvulnerability__fix=False)
 
     def with_vulnerability_counts(self):
         return self.annotate(
@@ -323,7 +323,9 @@ class PackageRelatedVulnerability(models.Model):
     )
 
     fix = models.BooleanField(
-        default=False, help_text="Does this relation fix the specified vulnerability ?"
+        default=False,
+        db_index=True,
+        help_text="Does this relation fix the specified vulnerability ?",
     )
 
     class Meta: