完善对话评估1

apps/rlhf/views.py

@@ -606,18 +606,34 @@ class ConversationEvaluationViewSet(StandardResponseMixin, viewsets.ModelViewSet
                 status_code=status.HTTP_404_NOT_FOUND
             )
         
-        # 创建或更新评估
-        evaluation_id = str(uuid.uuid4())
-        evaluation, created = ConversationEvaluation.objects.update_or_create(
+        # 检查是否已存在评估
+        existing_evaluation = ConversationEvaluation.objects.filter(
+            conversation_id=conversation_id,
+            user=request.user
+        ).first()
+        
+        if existing_evaluation:
+            # 如果已存在评估，返回提示信息
+            return self.get_standard_response(
+                code=400,
+                message='您已经对这个对话进行过评估，请使用PUT或PATCH方法更新评估',
+                data={
+                    'evaluation_id': existing_evaluation.id,
+                    'created_at': existing_evaluation.created_at
+                },
+                status_code=status.HTTP_400_BAD_REQUEST
+            )
+        
+        # 创建新评估
+        evaluation = ConversationEvaluation.objects.create(
+            id=str(uuid.uuid4()),
             conversation_id=conversation_id,
             user=request.user,
-            defaults={
-                'id': evaluation_id,
-                'overall_feeling': overall_feeling,
-                'has_logical_issues': has_logical_issues,
-                'needs_satisfied': needs_satisfied,
-                'updated_at': timezone.now()
-            }
+            overall_feeling=overall_feeling,
+            has_logical_issues=has_logical_issues,
+            needs_satisfied=needs_satisfied,
+            created_at=timezone.now(),
+            updated_at=timezone.now()
         )
         
         # 记录活动日志