models: Extract zerver.models.muted_users.

Signed-off-by: Anders Kaseorg <anders@zulip.com>

zerver/models/__init__.py

@@ -32,7 +32,6 @@ from zerver.lib.cache import (
     cache_delete,
     cache_with_key,
     flush_message,
-    flush_muting_users_cache,
     flush_submessage,
     flush_used_upload_space_cache,
     realm_alert_words_automaton_cache_key,
@@ -65,6 +64,7 @@ from zerver.models.groups import GroupGroupMembership as GroupGroupMembership
 from zerver.models.groups import UserGroup as UserGroup
 from zerver.models.groups import UserGroupMembership as UserGroupMembership
 from zerver.models.linkifiers import RealmFilter as RealmFilter
+from zerver.models.muted_users import MutedUser as MutedUser
 from zerver.models.prereg_users import EmailChangeStatus as EmailChangeStatus
 from zerver.models.prereg_users import MultiuseInvite as MultiuseInvite
 from zerver.models.prereg_users import PreregistrationRealm as PreregistrationRealm
@@ -143,23 +143,6 @@ def query_for_ids(
     return query
 
 
-class MutedUser(models.Model):
-    user_profile = models.ForeignKey(UserProfile, related_name="muter", on_delete=CASCADE)
-    muted_user = models.ForeignKey(UserProfile, related_name="muted", on_delete=CASCADE)
-    date_muted = models.DateTimeField(default=timezone_now)
-
-    class Meta:
-        unique_together = ("user_profile", "muted_user")
-
-    @override
-    def __str__(self) -> str:
-        return f"{self.user_profile.email} -> {self.muted_user.email}"
-
-
-post_save.connect(flush_muting_users_cache, sender=MutedUser)
-post_delete.connect(flush_muting_users_cache, sender=MutedUser)
-
-
 class Client(models.Model):
     MAX_NAME_LENGTH = 30
     name = models.CharField(max_length=MAX_NAME_LENGTH, db_index=True, unique=True)

zerver/models/muted_users.py

@@ -0,0 +1,25 @@
+from django.db import models
+from django.db.models import CASCADE
+from django.db.models.signals import post_delete, post_save
+from django.utils.timezone import now as timezone_now
+from typing_extensions import override
+
+from zerver.lib.cache import flush_muting_users_cache
+from zerver.models.users import UserProfile
+
+
+class MutedUser(models.Model):
+    user_profile = models.ForeignKey(UserProfile, related_name="muter", on_delete=CASCADE)
+    muted_user = models.ForeignKey(UserProfile, related_name="muted", on_delete=CASCADE)
+    date_muted = models.DateTimeField(default=timezone_now)
+
+    class Meta:
+        unique_together = ("user_profile", "muted_user")
+
+    @override
+    def __str__(self) -> str:
+        return f"{self.user_profile.email} -> {self.muted_user.email}"
+
+
+post_save.connect(flush_muting_users_cache, sender=MutedUser)
+post_delete.connect(flush_muting_users_cache, sender=MutedUser)