fix(communications): Исправить вызов метода get_participants()

- signals.py: chat.get_participants → chat.get_participants()
- notifications/handlers.py: chat.get_participants → chat.get_participants()

Ошибка: AttributeError: 'function' object has no attribute 'exclude'
Причина: Метод не вызывался, пытались вызвать метод на самом объекте функции

Исправлено: Добавлены () для вызова метода и получения QuerySet

backend/communications/api/serializers.py

@@ -3,12 +3,12 @@ Serializers for Communications API
 """
 from rest_framework import serializers
 from django.contrib.auth import get_user_model
-from communications.models import (
+from ..models import (
     Chat, Message, MessageAttachment, 
     MessageReaction, Poll, PollOption, PollVote,
     ChatMembership, ChatUserSettings
 )
-from communications.serialization import serialize_message
+from ..serialization import serialize_message
 
 Employee = get_user_model()
 

backend/communications/api/viewsets.py

@@ -19,12 +19,12 @@ from datetime import timezone as dt_tz
 
 from asgiref.sync import async_to_sync
 from channels.layers import get_channel_layer
-from communications.models import (Chat, ChatMembership, ChatReadState,
+from ..models import (Chat, ChatMembership, ChatReadState,
                                    ChatUserSettings, Message,
                                    MessageAttachment, MessageReaction, Poll,
                                    PollOption, PollVote)
 from communications.serialization import serialize_message
-from communications.utils import _coerce_ts, user_can_access_chat
+from ..utils import _coerce_ts, user_can_access_chat
 from django.contrib.auth import get_user_model
 from django.db import transaction
 from django.db.models import Count, Exists, OuterRef, Prefetch, Q, Subquery

backend/communications/notifications/handlers.py

@@ -71,7 +71,7 @@ def notify_new_message(message):
     
     # Получаем всех участников чата кроме автора
     if chat.type in ['announcement', 'channel', 'department', 'global']:
-        participants = chat.get_participants.exclude(id=author.id)
+        participants = chat.get_participants().exclude(id=author.id)
     else:
         participants = chat.participants.exclude(id=author.id)
     

backend/communications/signals.py

@@ -123,7 +123,7 @@ def increment_unread_count_on_new_message(sender, instance, created, **kwargs):
     try:
         # Получаем всех участников чата
         chat = instance.chat
-        participants = chat.get_participants.exclude(id=instance.author_id)
+        participants = chat.get_participants().exclude(id=instance.author_id)
         
         # Инкрементируем счетчик для существующих ChatReadState
         # Только для тех, кто еще не прочитал это сообщение