Mongoose API 通过 _id 获取数组中的嵌套项

Question

我正在用 Express 和 Mongoose（前面的 Backbone）构建一个 api。我有一个 Mongoose User 模型，其中包含一个名为“orders”的数组。我需要设置一个按 ID 读取单个订单的创建方法。

当我导航到：

http://localhost:3000/test/

对于已登录的用户，我得到以下信息：

{
  "__v": 0,
  "_id": "537d09a1fe47a00000c54514",
  "kittenType": "Grumpy",
  "local": {
    "petname": "Smeagol",
    "password": "$2a$08$X4sF5UmYZ3/2cxfRzpPcq.pphYFRKcb.6xBGupdUyUMgWJlFSr/uq",
    "email": "julie@gmail.com"
  },

  "orders": [
    {
      "title": "Big Max Fountain",
      "description": "Large capacity drinking fountain",
      "quantity": "2",
      "price": 500,
      "_id": "53837e9e681808e6ea9f9ca4",
      "modified": "2014-05-28T23:49:10.232Z"
    },
    {
      "title": "Lotus Fountain",
      "description": "Tranquil pools of water",
      "quantity": "1",
      "price": 1000,
      "_id": "53867762ff514df026b608fa",
      "modified": "2014-05-28T23:55:16.263Z"
    }
  ]
}

当我导航到：

http://localhost:3000/test/orders

我发送登录用户的订单列表（这给了我订单数组：

app.get('/test/orders', function(req, res) {
  User.findOne({'_id': req.user.id }, function(err, user) {
    if (err)
      return done(err);

    if (user) {
      res.send(user.orders);

    }

  });
});

然后我如何通过 id 发送每个订单？

app.get('/test/orders/:id', function(req, res) {
  User.findOne({'_id': req.user.id }, function(err, user) {
    if (err)
      return done(err);

    if (user) {

      //send the order by id here thru the url

    }
  });
});

回复后添加：

var userSchema = mongoose.Schema({

user            : {
    type: mongoose.Schema.ObjectId,
    ref: 'User'
},
orders: [{
    title: String,  
    description: String, 
    quantity : String,
    price : Number,
    modified: { type: Date, default: Date.now }
}],
signup: [{
    name: String,
    courseDay: String,
    time: String,
    location: String,
    modified: { type: Date, default: Date.now }
}],

kittenType   : String,
profilePhoto : String,
profilePage :  String,
local            : {
    email        : String,
    password     : String,
    petname      : String,
    path         : String,

}

路线：

app.get('/test', function(req,res) {
res.send(res.locals.user);
});

app.get('/test/orders', function(req, res) {
User.findOne({'_id': req.user.id }, function(err, user) {
    if (err) 
        return done(err);

    if (user) {
        res.send(user.orders);

    }

});
});

app.post('/api/orders', isLoggedIn, function (req, res){

User.findOne({'_id': req.user.id }, function(err, user) {
    if (err)
        return done(err);

    if (user) {
        user.orders.quantity = req.body.quantity;
        user.orders.description = req.body.description;
        user.orders.title = req.body.title;
        user.orders.price = req.body.price;
        user.orders.modified = req.body.modified;


        user.update({$push: { "orders" : 
            {   title: user.orders.title,
                description: user.orders.description,
                quantity: user.orders.quantity,
                price: user.orders.price,
                modified: user.orders.modified
            }
            }},{safe:true, upsert:true},function(err){
                if(err){
                    console.log(err);
                } else{
                    console.log("Successfully added" + user.orders);
                }
        });

        console.log('located a user');
    }       
});

});

工作获取方法：

app.get('/test/orders/:id', function(req, res) {
  User.findOne({'_id': req.user.id }, function(err, user) {
    if (err)
      return done(err);
    if (user) {
      console.log(user.orders);
      var order = user.orders.filter(function(e){ return e._id == req.params.id })[0]
      console.log(order);
      res.send(order);
    }
  });
});

Answer 1

我认为在这种情况下您不需要查找用户。足以找到条件合适的Order：

app.get('/test/orders/:id', function(req, res) {
  Order.findOne({'_id': req.params.id, 'user_id': req.user.id }, function(err, order) {
    if (err)
      return done(err);
    if (order) {
      res.send(order);
    }
  });
});

但是您应该记录req 以确保您使用正确的ids。这还取决于您未公开的路线。

或者如果您需要找到User 型号，您可以简单地使用过滤方法。代码与第一种方法几乎相同：

app.get('/test/orders/:id', function(req, res) {
  User.findOne({'_id': req.user.id }, function(err, user) {
    if (err)
      return done(err);
    if (user) {
      console.log(user.orders); // returns an array
      // console.log(req.id); // to be sure that it returns proper order id
      // perhaps it could be next
      console.log(req.params.id);

      var order_id = user.orders.filter(function(e){ return e == req.params.id })[0]

      // then find this order
      Order.findOne({'_id': order_id }, function(err1, order) {
        if (err1)
          return done(err1);
        if (order) {
          res.send(order);
        }
      });
    }
  });
});