feat: provide guild objects when guild is uncached

Author: onerandomusername

changelog/647.breaking.rst

@@ -0,0 +1,4 @@
+:attr:`Interaction.guild` is now an unavailable guild instance if the guild could not be found in cache.
+
+Importantly, this affects code which used ``inter.guild`` as a logic gate. A simple solution to this is to now use :attr:`Interaction.guild_id` instead.
+To know whether or not the bot is in the guild, check if the guild is present in the client's guild cache. If intents are not enabled, it is not possible to detect whether or not the bot is in the guild.

disnake/interactions/base.py

@@ -233,8 +233,19 @@ def user(self) -> Union[User, Member]:
 
     @property
     def guild(self) -> Optional[Guild]:
-        """Optional[:class:`Guild`]: The guild the interaction was sent from."""
-        return self._state._get_guild(self.guild_id)
+        """Optional[:class:`Guild`]: The guild the interaction was sent from.
+
+        .. versionchanged:: 2.6
+
+            Returns an unavailable :class:`Guild` object when the guild could not be resolved from cache.
+        """
+        if self.guild_id is None:
+            return None
+
+        return self._state._get_guild(self.guild_id) or Guild(
+            data={"unavailable": True, "id": self.guild_id},  # type: ignore # this is a valid guild payload
+            state=self._state,
+        )
 
     @utils.cached_slot_property("_cs_me")
     def me(self) -> Union[Member, ClientUser]: