【悟凡】真正意义上的净土重生：只保留核心逻辑

backend/meetings/serializers.py

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+from rest_framework import serializers
+from .models import Meeting, Participant, Message, MeetingMinutes
+from django.contrib.auth import get_user_model
+
+User = get_user_model()
+
+
+class UserSerializer(serializers.ModelSerializer):
+    """用户序列化器"""
+    class Meta:
+        model = User
+        fields = ['id', 'username', 'email', 'created_at']
+
+
+class MeetingSerializer(serializers.ModelSerializer):
+    """会议室序列化器"""
+    host_name = serializers.CharField(source='host.username', read_only=True)
+    participant_count = serializers.SerializerMethodField()
+    
+    class Meta:
+        model = Meeting
+        fields = [
+            'id', 'topic', 'host', 'host_name', 'status', 'invite_code',
+            'created_at', 'started_at', 'ended_at', 'participant_count'
+        ]
+        read_only_fields = ['host', 'invite_code', 'status']
+    
+    def get_participant_count(self, obj):
+        return obj.participants.filter(left_at__isnull=True).count()
+    
+    def create(self, validated_data):
+        # 使用第一个用户作为 host（临时方案）
+        host = User.objects.first()
+        validated_data['host'] = host
+        return super().create(validated_data)
+
+
+class ParticipantSerializer(serializers.ModelSerializer):
+    """参会者序列化器"""
+    class Meta:
+        model = Participant
+        fields = [
+            'id', 'meeting', 'user', 'agent_type', 'agent_id',
+            'agent_name', 'agent_emoji', 'nickname', 'is_host',
+            'joined_at', 'api_key'
+        ]
+        read_only_fields = ['api_key', 'joined_at']
+
+
+class MessageSerializer(serializers.ModelSerializer):
+    """消息序列化器"""
+    sender_name = serializers.CharField(source='sender.nickname', read_only=True)
+    sender_emoji = serializers.CharField(source='sender.agent_emoji', read_only=True)
+    
+    class Meta:
+        model = Message
+        fields = [
+            'id', 'meeting', 'sender', 'sender_name', 'sender_emoji',
+            'content', 'created_at', 'is_broadcast', 'requires_response',
+            'in_reply_to', 'read_by'
+        ]
+        read_only_fields = ['sender', 'created_at']
+
+
+class InboxSerializer(serializers.Serializer):
+    """信箱序列化器"""
+    unread_count = serializers.IntegerField()
+    messages = MessageSerializer(many=True)
+
+
+class MeetingMinutesSerializer(serializers.ModelSerializer):
+    """会议纪要序列化器"""
+    class Meta:
+        model = MeetingMinutes
+        fields = ['meeting', 'content', 'generated_at', 'exported_at']
+        read_only_fields = ['meeting', 'generated_at']