fix!: correct guild_scheduled_event request and json serialisation in helper methods. (#468)

* fix!: make scheduled events work

Author: EepyElvyra

interactions/api/http.py

@@ -2586,7 +2586,7 @@ async def create_scheduled_event(self, guild_id: Snowflake, data: dict) -> dict:
         payload = {k: v for k, v in data.items() if k in valid_keys}
 
         return await self._req.request(
-            Route("POST", "guilds/{guild_id}/scheduled-events/", guild_id=int(guild_id)),
+            Route("POST", "/guilds/{guild_id}/scheduled-events", guild_id=int(guild_id)),
             json=payload,
         )
 

interactions/api/models/guild.py

@@ -1060,6 +1060,10 @@ async def create_scheduled_event(
             raise ValueError(
                 "entity_metadata is required for external events!"
             )  # TODO: replace with custom error formatter
+        if entity_type == EntityType.EXTERNAL and scheduled_end_time is MISSING:
+            raise ValueError(
+                "External events require an end time!"
+            )  # TODO: replace with custom error formatter
 
         payload = {
             "name": name,
@@ -1071,7 +1075,7 @@ async def create_scheduled_event(
         if scheduled_end_time is not MISSING:
             payload["scheduled_end_time"] = scheduled_end_time
         if entity_metadata is not MISSING:
-            payload["entity_metadata"] = entity_metadata
+            payload["entity_metadata"] = entity_metadata._json
         if channel_id is not MISSING:
             payload["channel_id"] = channel_id
         if description is not MISSING:
@@ -1144,7 +1148,7 @@ async def modify_scheduled_event(
         if scheduled_end_time is not MISSING:
             payload["scheduled_end_time"] = scheduled_end_time
         if entity_metadata is not MISSING:
-            payload["entity_metadata"] = entity_metadata
+            payload["entity_metadata"] = entity_metadata._json
         if description is not MISSING:
             payload["description"] = description
         if status is not MISSING: