gukgjzkgjhgjh

backend/social/chat/serializers.py

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+from rest_framework import serializers
+from .models import Chat, Message, MessageFile, MessageHistory, MessageReaction
+
+
+class MessageFileSerializer(serializers.ModelSerializer):
+    class Meta:
+        model = MessageFile
+        fields = ['id', 'file', 'media_type', 'uploaded_at']
+        read_only_fields = ['uploaded_at']
+
+
+class MessageReactionSerializer(serializers.ModelSerializer):
+    class Meta:
+        model = MessageReaction
+        fields = ['id', 'user', 'emoji', 'created_at']
+        read_only_fields = ['user', 'created_at']
+
+
+class MessageHistorySerializer(serializers.ModelSerializer):
+    class Meta:
+        model = MessageHistory
+        fields = ['id', 'old_content', 'archived_at']
+        read_only_fields = ['archived_at']
+
+
+class MessageSerializer(serializers.ModelSerializer):
+    media_files = MessageFileSerializer(many=True, read_only=True)
+    reactions = MessageReactionSerializer(many=True, read_only=True)
+
+    class Meta:
+        model = Message
+        fields = [
+            'id', 'chat', 'sender', 'reply_to',
+            'content', 'is_edited', 'edited_at',
+            'created_at', 'updated_at',
+            'media_files', 'reactions',
+        ]
+        read_only_fields = ['sender', 'chat', 'reply_to', 'is_edited', 'edited_at', 'created_at', 'updated_at']
+
+
+class MessageSendSerializer(serializers.Serializer):
+    """Used for the HTTP send endpoint (text + optional files)."""
+    chat = serializers.PrimaryKeyRelatedField(queryset=Chat.objects.all())
+    content = serializers.CharField(required=False, allow_blank=True, default='')
+    reply_to = serializers.PrimaryKeyRelatedField(
+        queryset=Message.objects.all(), required=False, allow_null=True
+    )
+    # files come via request.FILES - declared here for schema documentation only
+    files = serializers.ListField(
+        child=serializers.FileField(allow_empty_file=False, use_url=False),
+        required=False,
+        default=list,
+        write_only=True,
+    )
+
+    def validate(self, attrs):
+        if not attrs.get('content') and not attrs.get('files'):
+            raise serializers.ValidationError('A message must have content or at least one file.')
+        return attrs
+
+
+class ChatSerializer(serializers.ModelSerializer):
+    class Meta:
+        model = Chat
+        fields = [
+            'id', 'chat_type', 'owner', 'name',
+            'icon', 'banner', 'members', 'moderators',
+            'hub', 'created_at', 'updated_at',
+        ]
+        read_only_fields = ['owner', 'created_at', 'updated_at']
+
+
+class ChatMemberSerializer(serializers.Serializer):
+    user_id = serializers.IntegerField(help_text='PK of the user to add or remove.')