猫鼬模式，模型和API

Question

我正在尝试根据用户ID检索项目。我正在使用Postman对其进行测试，但是我无法根据用户ID成功获取商品。在邮递员中，我试图获取类似这样的项目：localhost：5000 / api / items / user id会放在这里。基本上，当输入用户ID时，应该返回与该ID相关的所有项目。

**ItemSchema Model**
const mongoose = require('mongoose');
const Schema = mongoose.Schema;

//Create Item Schema
const ItemSchema = new Schema({

  name:{
    type: String,
    required: true
  },
  date:{
    type: Date,
    default: Date.now
  },
  user:{
    type: Schema.Types.ObjectId,
    ref:'User'
  }

});


module.exports = Item = mongoose.model('Item', ItemSchema);

**UserSchema Model**
const mongoose = require('mongoose');
const Schema = mongoose.Schema;


//Create User Schema
const UserSchema = new Schema({

  name:{
    type: String,
    required: true
  },
  title:{
    type: String,
    required: true
  },
  age:{
    type: Number,
    required: true
  },
  items:[{type: Schema.Types.ObjectId, ref: 'Item' }]

});


module.exports = User = mongoose.model('User', UserSchema);


**routes/api/items.js**
const express = require('express');
const router = express.Router();

//Items Model
const Item = require('../../models/Items');


//@Route GET api/items
//@Description GET all items
//@Access Public
router.get('/', (req, res) =>{
  Item.find({user:req.body.user})
      .then(items => res.json(items));
});


//@Route POST api/items
//@Description POST an item
//@Access Public
router.post('/', (req, res) =>{

  const newItem = new Item ({
    name: req.body.name,
    user: req.body.user

  });

  newItem.save().then(item => res.json(item));
});

//@Route DELETE api/items/:id
//@Description DELETE an item
//@Access Public
router.delete('/:id', (req, res) =>{
  Item.findById(req.params.id)
      .then(item => item.remove().then(() => res.json({success: true})))
      .catch(err => res.status(404).json({success: false}));
});

module.exports = router;


**routes/api/users.js**
const express = require('express');
const router = express.Router();

//User Model
const User = require('../../models/Users');


//@Route GET api/users
//@Description GET all users
//@Access public
router.get('/', (req, res) =>{
  User.find()
       .then(users => res.json(users));
});

//@Route POST api/users
//@Description POST a user
//@Access public
router.post('/', (req, res) =>{

  const newUser = new User({
    name: req.body.name,
    title: req.body.title,
    age: req.body.age,
    items: req.body.items
  });

  newUser.save().then(user => res.json(user));
});

//@Route DELETE api/users/:id
//@Description DELETE a user
//@Access public
router.delete('/:id', (req, res) =>{
  User.findById(req.params.id)
      .then(user => user.remove().then(() => res.json({success:true})))
      .catch(err => res.status(404).json({success: false}));
});

module.exports = router;