ADD file via upload

Result.js

@@ -0,0 +1,49 @@
+const mongoose = require('mongoose');
+
+const answerSchema = new mongoose.Schema({
+    questionId: {
+        type: mongoose.Schema.Types.ObjectId,
+        required: true
+    },
+    userAnswer: mongoose.Schema.Types.Mixed,
+    isCorrect: {
+        type: Boolean,
+        required: true
+    },
+    score: {
+        type: Number,
+        required: true
+    }
+});
+
+const resultSchema = new mongoose.Schema({
+    exam: {
+        type: mongoose.Schema.Types.ObjectId,
+        ref: 'Exam',
+        required: true
+    },
+    user: {
+        type: mongoose.Schema.Types.ObjectId,
+        ref: 'User',
+        required: true
+    },
+    answers: [answerSchema],
+    totalScore: {
+        type: Number,
+        required: true
+    },
+    maxScore: {
+        type: Number,
+        required: true
+    },
+    timeTaken: { // 用时(秒)
+        type: Number,
+        required: true
+    },
+    submittedAt: {
+        type: Date,
+        default: Date.now
+    }
+});
+
+module.exports = mongoose.model('Result', resultSchema);