text: from apps.utils.model_helpers import ModelSerializer
  import models as chat_models
  
  class RoomSerializer(ModelSerializer):
      class Meta:
          model = chat_models.Room
  
  class ChatSessionSerializer(ModelSerializer):
      class Meta:
          model = chat_models.ChatSession
  
  class MessageSerializer(ModelSerializer):
      class Meta:
          model = chat_models.Message
  