Merge pull request #1232 from ae-utbm/group-simplify

simplify `User.is_in_group`

core/models.py

@@ -30,7 +30,7 @@ import unicodedata
 from datetime import timedelta
 from io import BytesIO
 from pathlib import Path
-from typing import TYPE_CHECKING, Optional, Self
+from typing import TYPE_CHECKING, Self
 from uuid import uuid4
 
 from django.conf import settings
@@ -97,48 +97,6 @@ def validate_promo(value: int) -> None:
         )
 
 
-def get_group(*, pk: int | None = None, name: str | None = None) -> Group | None:
-    """Search for a group by its primary key or its name.
-    Either one of the two must be set.
-
-    The result is cached for the default duration (should be 5 minutes).
-
-    Args:
-        pk: The primary key of the group
-        name: The name of the group
-
-    Returns:
-        The group if it exists, else None
-
-    Raises:
-        ValueError: If no group matches the criteria
-    """
-    if pk is None and name is None:
-        raise ValueError("Either pk or name must be set")
-
-    # replace space characters to hide warnings with memcached backend
-    pk_or_name: str | int = pk if pk is not None else name.replace(" ", "_")
-    group = cache.get(f"sith_group_{pk_or_name}")
-
-    if group == "not_found":
-        # Using None as a cache value is a little bit tricky,
-        # so we use a special string to represent None
-        return None
-    elif group is not None:
-        return group
-    # if this point is reached, the group is not in cache
-    if pk is not None:
-        group = Group.objects.filter(pk=pk).first()
-    else:
-        group = Group.objects.filter(name=name).first()
-    if group is not None:
-        name = group.name.replace(" ", "_")
-        cache.set_many({f"sith_group_{group.id}": group, f"sith_group_{name}": group})
-    else:
-        cache.set(f"sith_group_{pk_or_name}", "not_found")
-    return group
-
-
 class BanGroup(AuthGroup):
     """An anti-group, that removes permissions instead of giving them.
 
@@ -382,19 +340,18 @@ class User(AbstractUser):
         Returns:
              True if the user is the group, else False
         """
-        if pk is not None:
-            group: Optional[Group] = get_group(pk=pk)
-        elif name is not None:
-            group: Optional[Group] = get_group(name=name)
-        else:
+        if not pk and not name:
             raise ValueError("You must either provide the id or the name of the group")
-        if group is None:
+        group_id: int | None = (
+            pk or Group.objects.filter(name=name).values_list("id", flat=True).first()
+        )
+        if group_id is None:
             return False
-        if group.id == settings.SITH_GROUP_SUBSCRIBERS_ID:
+        if group_id == settings.SITH_GROUP_SUBSCRIBERS_ID:
             return self.is_subscribed
-        if group.id == settings.SITH_GROUP_ROOT_ID:
+        if group_id == settings.SITH_GROUP_ROOT_ID:
             return self.is_root
-        return group in self.cached_groups
+        return any(g.id == group_id for g in self.cached_groups)
 
     @cached_property
     def cached_groups(self) -> list[Group]:
@@ -689,8 +646,8 @@ class AnonymousUser(AuthAnonymousUser):
         if pk is not None:
             return pk == allowed_id
         elif name is not None:
-            group = get_group(name=name)
-            return group is not None and group.id == allowed_id
+            group = Group.objects.get(id=allowed_id)
+            return group.name == name
         else:
             raise ValueError("You must either provide the id or the name of the group")
 

core/tests/test_core.py

@@ -421,18 +421,16 @@ class TestUserIsInGroup(TestCase):
 
         # clear the cached property `User.cached_groups`
         self.public_user.__dict__.pop("cached_groups", None)
-        cache.clear()
         # Test when the user is in the group
-        with self.assertNumQueries(2):
+        with self.assertNumQueries(1):
             self.public_user.is_in_group(pk=group_in.id)
         with self.assertNumQueries(0):
             self.public_user.is_in_group(pk=group_in.id)
 
         group_not_in = baker.make(Group)
         self.public_user.__dict__.pop("cached_groups", None)
-        cache.clear()
         # Test when the user is not in the group
-        with self.assertNumQueries(2):
+        with self.assertNumQueries(1):
             self.public_user.is_in_group(pk=group_not_in.id)
         with self.assertNumQueries(0):
             self.public_user.is_in_group(pk=group_not_in.id)