Update ExamAnswerAnalysisController.php

app/Http/Controllers/Api/ExamAnswerAnalysisController.php

@@ -37,7 +37,7 @@ class ExamAnswerAnalysisController extends Controller
             // 验证请求数据
             $validator = Validator::make($request->all(), [
                 'paper_id' => 'required|string|max:255',
-                'student_id' => 'required|string|max:255',
+                'student_id' => 'required|numeric',
                 'questions' => 'required|array|min:1',
                 'questions.*.question_bank_id' => 'required|numeric',
                 'questions.*.student_answer' => 'sometimes|string',