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ai-routes.js

@@ -230,8 +230,11 @@ router.post('/chat', checkAIAccess, async (req, res) => {
             }
         }
 
-        // 4. Save Final Answer
-        await ChatHistoryModel.create({ userId: user._id, role: 'model', text: finalResponseText });
+        // 4. Save Final Answer (Prevent Empty Text Error)
+        if (finalResponseText && finalResponseText.trim().length > 0) {
+            await ChatHistoryModel.create({ userId: user._id, role: 'model', text: finalResponseText });
+        }
+        
         recordUsage('agent-response', 'AGENT');
 
         // 5. Send Done Signal

ai-tools.js

@@ -20,7 +20,7 @@ const mongoTools = [
             },
             filter: {
               type: "OBJECT",
-              description: "Mongoose查询条件JSON。例: {className:'一年级(1)班', name:'张三'}。注意：查询班级时必须使用 'className' 字段。",
+              description: "Mongoose查询条件JSON。例: {className:'一年级(1)班', name:'张三'}。注意：查询班级时必须使用 'className' (禁止用 'class') 字段。",
             },
             limit: {
               type: "NUMBER",
@@ -198,6 +198,7 @@ async function executeMongoTool(functionCall, user, role, schoolId) {
     try {
         let result = [];
         let fields = ""; 
+        let relationalInfo = "";
 
         // 🔥 关系查询增强：Score 表没有 className，需要先查 Student 获取 studentNo
         if (collection === 'Score' && safeFilter.className) {
@@ -209,15 +210,16 @@ async function executeMongoTool(functionCall, user, role, schoolId) {
                 className: safeFilter.className // 这里已经是正则了
             };
             
-            const studentsInClass = await Student.find(studentQuery).select('studentNo');
+            const studentsInClass = await Student.find(studentQuery).select('studentNo name');
             const studentNos = studentsInClass.map(s => s.studentNo);
             
             if (studentNos.length === 0) {
-                console.log(`⚠️ [Relational] No students found in class: ${safeFilter.className}`);
-                return { info: `未找到班级符合条件的学生，无法查询成绩。` };
+                console.log(`⚠️ [Relational] No students found in class matching: ${JSON.stringify(safeFilter.className)}`);
+                return { info: `未找到班级符合条件的学生（查询条件：${JSON.stringify(safeFilter.className)}），无法查询成绩。` };
             }
 
             console.log(`✅ [Relational] Found ${studentNos.length} students. Translating to Score query...`);
+            relationalInfo = `(已找到 ${studentNos.length} 名学生，正在查询他们的成绩)`;
             
             // 替换查询条件：移除 className，添加 studentNo $in
             delete safeFilter.className;
@@ -255,7 +257,10 @@ async function executeMongoTool(functionCall, user, role, schoolId) {
         console.log(`===================================================\n`);
 
         if (result.length === 0) {
-            return { info: "未找到符合条件的数据。请尝试放宽查询条件，或确认班级/姓名格式（例如包含括号）。" };
+            let msg = "未找到符合条件的数据。";
+            if (relationalInfo) msg += " " + relationalInfo + " 但这些学生似乎还没有录入成绩。";
+            else msg += " 请尝试放宽查询条件，或确认班级/姓名格式（例如包含括号）。";
+            return { info: msg };
         }
         return result;