发送嵌套对象在GET请求中

huangapple
go评论95阅读模式
英文:

Send nested object on GET

问题

以下是翻译好的部分：

我有一个非常基本的模式，其中包含另一个名为Vehicle的对象。

  1. let rentSchema = new Schema({
  2.     code: {
  3.         type: Number
  4.     },
  5.     vehicle: {
  6.         type: mongoose.Schema.Types.ObjectId,
  7.         ref: 'Vehicle'
  8.     },
  9.     ongoing: {
  10.         type: Boolean,
  11.         default: false
  12.     }
  13. }, {collection: 'RentCollection'});

在控制器中查找所有：

  1. exports.getRent = function (req, res) {
  2.     // 在数据库中查找
  3.     rentSchema.find({}, function (err, rent) {
  4.         if (err) res.status(400).send(err);
  5.      
  6.         res.json(rent);
  7.     });
  8. };

响应作为Rents对象数组返回，但是Vehicle对象缺失在Rent对象中。这是为什么？

  1. _id: "5e04c19d0a0a100f58bd64b5"
  2. __v: 0
  3. ongoing: false
英文:

I have a very basic schema which has another object called Vehicle, inside

  1. let rentSchema = new Schema({
  2.     code: {
  3.         type: Number
  4.     },
  5.     vehicle: {
  6.         type: mongoose.Schema.Types.ObjectId,
  7.         ref: 'Vehicle'
  8.     },
  9.     ongoing: {
  10.         type: Boolean,
  11.         default: false
  12.     }
  13. }, {collection: 'RentCollection'});

Find all in the controller

  1. exports.getRent = function (req, res) {
  2.     // Find in the DB
  3.      rentSchema.find({}, function (err, rent) {
  4.         if (err) res.status(400).send(err);
  5.      
  6.         res.json(rent);
  7.      });
  8.  };

The response comes as an array of Rents but Vehicle object is missing from the Object Rent. Why is that?

  1. _id: "5e04c19d0a0a100f58bd64b5"
  2.  __v: 0 
  3. ongoing: false

答案1

得分: 1

以下是翻译好的部分：

1-) 首先，您需要创建一个模型并像这样导出它：

rent.js

  1. const mongoose = require("mongoose");
  2. const Schema = mongoose.Schema;
  4. let rentSchema = new Schema(
  5.   {
  6.     code: {
  7.       type: Number
  8.     },
  9.     vehicle: {
  10.       type: mongoose.Schema.Types.ObjectId,
  11.       ref: "Vehicle"
  12.     },
  13.     ongoing: {
  14.       type: Boolean,
  15.       default: false
  16.     }
  17.   },
  18.   { collection: "RentCollection" }
  19. );
  21. module.exports = mongoose.model("Rent", rentSchema);

2-) 假设您有这个车辆模型：

vehicle.js

  1. const mongoose = require("mongoose");
  2. const Schema = mongoose.Schema;
  4. let vehicleSchema = new Schema(
  5.   {
  6.     name: String
  7.   },
  8.   { collection: "VehicleCollection" }
  9. );
  11. module.exports = mongoose.model("Vehicle", vehicleSchema);

3-) 首先，让我们在VehicleCollection中创建一个车辆，像这样：

  1. {
  2.     "_id": "5e0f465205515667746fd51a",
  3.     "name": "Vehicle 1",
  4.     "__v": 0
  5. }

4-) 然后，让我们使用这辆车的ID在RentCollection中创建一个租赁文档，如下所示：

  1. {
  2.     "ongoing": false,
  3.     "_id": "5e0f46b805515667746fd51d",
  4.     "code": 1,
  5.     "vehicle": "5e0f465205515667746fd51a",
  6.     "__v": 0
  7. }

5-) 现在，我们可以使用以下代码来将车辆与租赁关联起来。

  1. const Rent = require("../models/rent"); //todo: change to path to the rent.js
  3. exports.getRent = function(req, res) {
  4.   Rent.find({})
  5.     .populate("vehicle")
  6.     .exec(function(err, rent) {
  7.       if (err) {
  8.         res.status(500).send(err);
  9.       } else {
  10.         if (!rent) {
  11.           res.status(404).send("No rent found");
  12.         } else {
  13.           res.json(rent);
  14.         }
  15.       }
  16.     });
  17. };

6-) 结果将是：

  1. [
  2.     {
  3.         "ongoing": false,
  4.         "_id": "5e0f46b805515667746fd51d",
  5.         "code": 1,
  6.         "vehicle": {
  7.             "_id": "5e0f465205515667746fd51a",
  8.             "name": "Vehicle 1",
  9.             "__v": 0
  10.         },
  11.         "__v": 0
  12.     }
  13. ]
英文:

Here is step by step explanations to make it work:

1-) First you need to create a model and export it like this:

rent.js

  1. const mongoose = require("mongoose");
  2. const Schema = mongoose.Schema;
  4. let rentSchema = new Schema(
  5.   {
  6.     code: {
  7.       type: Number
  8.     },
  9.     vehicle: {
  10.       type: mongoose.Schema.Types.ObjectId,
  11.       ref: "Vehicle"
  12.     },
  13.     ongoing: {
  14.       type: Boolean,
  15.       default: false
  16.     }
  17.   },
  18.   { collection: "RentCollection" }
  19. );
  21. module.exports = mongoose.model("Rent", rentSchema);

2-) Let's say you have this Vehicle model:

vehicle.js

  1. const mongoose = require("mongoose");
  2. const Schema = mongoose.Schema;
  4. let vehicleSchema = new Schema(
  5.   {
  6.     name: String
  7.   },
  8.   { collection: "VehicleCollection" }
  9. );
  11. module.exports = mongoose.model("Vehicle", vehicleSchema);

3-) First let's create a vehicle like this in the VehicleCollection like this:

  1. {
  2.     "_id": "5e0f465205515667746fd51a",
  3.     "name": "Vehicle 1",
  4.     "__v": 0
  5. }

4-) Then let's create a rent document in RentCollection using this vehicle id like this:

  1. {
  2.     "ongoing": false,
  3.     "_id": "5e0f46b805515667746fd51d",
  4.     "code": 1,
  5.     "vehicle": "5e0f465205515667746fd51a",
  6.     "__v": 0
  7. }

5-) Now we can use the following code, to populate the vehicle with the rents.

  1. const Rent = require("../models/rent"); //todo: change to path to the rent.js
  3. exports.getRent = function(req, res) {
  4.   Rent.find({})
  5.     .populate("vehicle")
  6.     .exec(function(err, rent) {
  7.       if (err) {
  8.         res.status(500).send(err);
  9.       } else {
  10.         if (!rent) {
  11.           res.status(404).send("No rent found");
  12.         } else {
  13.           res.json(rent);
  14.         }
  15.       }
  16.     });
  17. };

6-) The result will be:

  1. [
  2.     {
  3.         "ongoing": false,
  4.         "_id": "5e0f46b805515667746fd51d",
  5.         "code": 1,
  6.         "vehicle": {
  7.             "_id": "5e0f465205515667746fd51a",
  8.             "name": "Vehicle 1",
  9.             "__v": 0
  10.         },
  11.         "__v": 0
  12.     }
  13. ]

答案2

得分: 0

你需要使用 populate 方法来填充一个 vehicle 对象。

来自文档的示例：

  1. rentSchema.
  2.   findOne({}).
  3.   populate('vehicle').
  4.   exec(function (err, obj) {
  5.     if (err) return handleError(err);
  6.     console.log(obj);
  7.   });

另外，在你当前的代码中，你还没有设置模型：

RentCollection = mongoose.model('RentCollection', rentSchema);

英文:

You will have to use the populate method to populate a vehicle object.

From docs:

  1. rentSchema.
  2.   findOne({}).
  3.   populate('vehicle').
  4.   exec(function (err, obj) {
  5.     if (err) return handleError(err);
  6.     console.log(obj);
  8.   });

Also in your current code, you havent setted up model:

RentCollection = mongoose.model('RentCollection', rentSchema);

huangapple
  • 本文由 发表于 2020年1月3日 21:24:46
  • 转载请务必保留本文链接：https://go.coder-hub.com/59579395.html
  • javascript
  • mongoose
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