Clean up more sql queries

judge/models/comment.py

@@ -73,12 +73,7 @@ class Comment(MPTTModel):
 
     @classmethod
     def most_recent(cls, user, n, batch=None, organization=None):
-        queryset = (
-            cls.objects.filter(hidden=False)
-            .select_related("author__user")
-            .defer("author__about")
-            .order_by("-id")
-        )
+        queryset = cls.objects.filter(hidden=False).order_by("-id")
 
         if organization:
             queryset = queryset.filter(author__in=organization.members.all())

judge/models/profile.py

@@ -547,15 +547,6 @@ def on_user_save(sender, instance, **kwargs):
         pass
 
 
-@receiver([pre_save], sender=Profile)
-def on_profile_save(sender, instance, **kwargs):
-    if instance.id is None:
-        return
-    prev = sender.objects.get(id=instance.id)
-    if prev.mute != instance.mute or prev.profile_image != instance.profile_image:
-        _get_basic_info.dirty(instance.id)
-
-
 @cache_wrapper(prefix="Pgbi3")
 def _get_basic_info(profile_id):
     profile = (

judge/models/runtime.py

@@ -11,6 +11,7 @@ from django.utils.functional import cached_property
 from django.utils.translation import gettext_lazy as _
 
 from judge.judgeapi import disconnect_judge
+from judge.caching import cache_wrapper
 
 __all__ = ["Language", "RuntimeVersion", "Judge"]
 
@@ -147,14 +148,11 @@ class Language(models.Model):
 
     @classmethod
     def get_default_language(cls):
-        try:
-            return Language.objects.get(key=settings.DEFAULT_USER_LANGUAGE)
-        except Language.DoesNotExist:
-            return cls.get_python3()
+        return _get_default_language()
 
     @classmethod
     def get_default_language_pk(cls):
-        return cls.get_default_language().pk
+        return _get_default_language().pk
 
     class Meta:
         ordering = ["key"]
@@ -162,6 +160,14 @@ class Language(models.Model):
         verbose_name_plural = _("languages")
 
 
+@cache_wrapper(prefix="gdl")
+def _get_default_language():
+    try:
+        return Language.objects.get(key=settings.DEFAULT_USER_LANGUAGE)
+    except Language.DoesNotExist:
+        return cls.get_python3()
+
+
 class RuntimeVersion(models.Model):
     language = models.ForeignKey(
         Language,

judge/models/submission.py

@@ -220,7 +220,7 @@ class Submission(models.Model):
     def id_secret(self):
         return self.get_id_secret(self.id)
 
-    def is_accessible_by(self, profile):
+    def is_accessible_by(self, profile, check_contest=True):
         if not profile:
             return False
 
@@ -239,9 +239,10 @@ class Submission(models.Model):
         if self.problem.is_public and user.has_perm("judge.view_public_submission"):
             return True
 
-        contest = self.contest_object
-        if contest and contest.is_editable_by(user):
-            return True
+        if check_contest:
+            contest = self.contest_object
+            if contest and contest.is_editable_by(user):
+                return True
 
         from judge.utils.problems import (
             user_completed_ids,