feat(chat): 单向聊天的历史消息获取

core/routers/chat/services.py

@@ -94,18 +94,31 @@ async def get_unread_messages_per_chat(
     return results
 
 
-async def get_chat(chat_guid, login_user: User, db_session: AsyncSession) -> Chat | None:
+async def get_chat(chat_guid, login_user: User, db_session: AsyncSession,
+                   is_query_messages: bool = False) -> Chat | None:
     subquery = (
         select(ChatParticipant.chat_id)
-        .where(ChatParticipant.user_id == login_user.user_id)
+        .where(
+            and_(
+                ChatParticipant.user_id == login_user.user_id,
+                ChatParticipant.is_deleted == False
+            )
+        )
     ).scalar_subquery()
 
+    conditions = [
+        Chat.id.in_(subquery),
+        Chat.guid == chat_guid
+    ]
+    if is_query_messages is False:
+        conditions.append(
+            Chat.is_deleted == False
+        )
+
     query = (
         select(Chat)
         .where(and_(
-            Chat.id.in_(subquery),
-            Chat.guid == chat_guid,
-            Chat.is_deleted == False
+            *conditions
         ))
     )
     result = await db_session.execute(query)