Migration edit: Allow null values in delisted

Author: benjaoming

readthedocs/projects/migrations/0096_add_project_delisted.py

@@ -1,4 +1,4 @@
-# Generated by Django 3.2.18 on 2023-02-24 16:02
+# Generated by Django 3.2.18 on 2023-02-28 16:27
 
 from django.db import migrations, models
 
@@ -16,6 +16,7 @@ class Migration(migrations.Migration):
             field=models.BooleanField(
                 default=False,
                 help_text="Delisting a project removes it from Read the Docs search indexing and asks external search engines to remove it via robots.txt",
+                null=True,
                 verbose_name="Delisted",
             ),
         ),
@@ -25,6 +26,7 @@ class Migration(migrations.Migration):
             field=models.BooleanField(
                 default=False,
                 help_text="Delisting a project removes it from Read the Docs search indexing and asks external search engines to remove it via robots.txt",
+                null=True,
                 verbose_name="Delisted",
             ),
         ),

readthedocs/projects/models.py

@@ -362,7 +362,11 @@ class Project(models.Model):
 
     skip = models.BooleanField(_("Skip (disable) building this project"), default=False)
 
+    # null=True can be removed in a later migration
+    # be careful if adding new queries on this, .filter(delisted=False) does not work
+    # but .exclude(delisted=True) does!
     delisted = models.BooleanField(
+        null=True,
         default=False,
         verbose_name=_("Delisted"),
         help_text=_(