Set related name on site reference of ExtensibleModel to '+'

CHANGELOG.rst

@@ -61,6 +61,8 @@ Fixed
 * Invitations for existing short name did not work.
 * Invitations for persons without pre-defined e-mail address did not behave correctly
 * OIDC scope "phone" had no claims.
+* [Dev] Site reference on extensible models can no longer cause name clashes
+  because of its related name.
 
 Removed
 ~~~~~~~

aleksis/core/mixins.py

@@ -130,7 +130,7 @@ class ExtensibleModel(models.Model, metaclass=_ExtensibleModelBase):
     icon_ = "radiobox-blank"
 
     site = models.ForeignKey(
-        Site, on_delete=models.CASCADE, default=settings.SITE_ID, editable=False
+        Site, on_delete=models.CASCADE, default=settings.SITE_ID, editable=False, related_name="+"
     )
     objects = CurrentSiteManager()
     objects_all_sites = models.Manager()