我不能应付猫鼬的人口

Question

我认为在控制台中尝试登录“ category”时，并没有填充类别，因为我收到“ ReferenceError：类别未定义”。 对我来说，就像在文档中一样，但正如我们所看到的那样。 有谁能告诉我这是怎么回事？

//model/Category.js

const mongoose = require("mongoose");
const Schema = mongoose.Schema;
 const CatSchema = new Schema({
    title: {
        type: String,
        required: true
    },
    body: {
        type: String,
        required: true
    }
});
 mongoose.model("categories", CatSchema, "categories");

模型/ Story.js

const mongoose = require("mongoose");
const Schema = mongoose.Schema;
     const StorySchema = new Schema({
    title: {
        type: String,
        required: true
    },
    body: {
        type: String,
        required: true
    },
    category: {
        type: Schema.Types.ObjectId,
        ref: "categories"
    }

});
     mongoose.model("stories", StorySchema, "stories");

路线/ stories.js

const express = require('express');
const router = express.Router();
const mongoose = require('mongoose');
const Category = mongoose.model('categories');
const Story = mongoose.model('stories');
     router.get('/add', (req, res) => {
    Story.find()
        .populate('category',  'title')
        .then(stories => {
            res.render('stories/add', {
                stories: stories
            });
        });
});

Answer 1

Query.prototype.populate()返回一个需要运行.exec()的Query对象，请尝试以下操作：

Story.find({})
    .populate('category',  'title')
    .exec()
    .then(stories => {
        res.render('stories/add', {
            stories: stories
        });
});

Answer 2

我要如何使用它存在问题。 代码有效