我有一个叫做people的mongodb集合 其架构如下:
people: {
name: String,
friends: [{firstName: String, lastName: String}]
}
现在，我有一个非常基本的快速应用程序连接到数据库，并成功地创建“人”与一个空的朋友数组。
在应用程序的次要位置，有一个添加好友的表单。表单接收firstName和lastName，然后是带有名称字段的POSTs，同样用于引用适当的people对象。
我有一个困难的时间做的是创建一个新的朋友对象，然后“推”到朋友数组。
我知道当我通过mongo控制台这样做时，我使用$push作为查找标准后的第二个参数的更新函数，但我似乎找不到合适的方法让猫鼬这样做。
db.people.update({name: "John"}, {$push: {friends: {firstName: "Harry", lastName: "Potter"}}});
当前回答
要做到这一点，一个简单的方法是使用以下方法:
var John = people.findOne({name: "John"});
John.friends.push({firstName: "Harry", lastName: "Potter"});
John.save();
其他回答
//这是我对这个问题的解决方案。
//我想在worKingHours(对象数组)中添加新对象——>
workingHours: [
{
workingDate: Date,
entryTime: Date,
exitTime: Date,
},
],
/ / employeeRoutes.js
const express = require("express");
const router = express.Router();
const EmployeeController = require("../controllers/employeeController");
router
.route("/:id")
.put(EmployeeController.updateWorkingDay)
/ / employeeModel.js
const mongoose = require("mongoose");
const validator = require("validator");
const employeeSchema = new mongoose.Schema(
{
name: {
type: String,
required: [true, "Please enter your name"],
},
address: {
type: String,
required: [true, "Please enter your name"],
},
email: {
type: String,
unique: true,
lowercase: true,
required: [true, "Please enter your name"],
validate: [validator.isEmail, "Please provide a valid email"],
},
phone: {
type: String,
required: [true, "Please enter your name"],
},
joiningDate: {
type: Date,
required: [true, "Please Enter your joining date"],
},
workingHours: [
{
workingDate: Date,
entryTime: Date,
exitTime: Date,
},
],
},
{
toJSON: { virtuals: true },
toObject: { virtuals: true },
}
);
const Employee = mongoose.model("Employee", employeeSchema);
module.exports = Employee;
/ / employeeContoller.js
/////////////////////////// 下面的解决方案是 ///////////////////////////////
//这是用来增加一天、进入和退出时间的
exports.updateWorkingDay = async (req, res) => {
const doc = await Employee.findByIdAndUpdate(req.params.id, {
$push: {
workingHours: req.body,
},
});
res.status(200).json({
status: "true",
data: { doc },
});
};
https://www.youtube.com/watch?v=gtUPPO8Re98
我也遇到过这个问题。我的解决办法是创建一个子模式。请参见下面的模型示例。
----人物模型
const mongoose = require('mongoose');
const SingleFriend = require('./SingleFriend');
const Schema = mongoose.Schema;
const productSchema = new Schema({
friends : [SingleFriend.schema]
});
module.exports = mongoose.model('Person', personSchema);
* * *重要:SingleFriend。Schema ->确保模式使用小写
——子图式
const mongoose = require('mongoose');
const Schema = mongoose.Schema;
const SingleFriendSchema = new Schema({
Name: String
});
module.exports = mongoose.model('SingleFriend', SingleFriendSchema);
使用$push更新文档并在数组中插入新值。
发现:
db.getCollection('noti').find({})
查找结果:
{
"_id" : ObjectId("5bc061f05a4c0511a9252e88"),
"count" : 1.0,
"color" : "green",
"icon" : "circle",
"graph" : [
{
"date" : ISODate("2018-10-24T08:55:13.331Z"),
"count" : 2.0
}
],
"name" : "online visitor",
"read" : false,
"date" : ISODate("2018-10-12T08:57:20.853Z"),
"__v" : 0.0
}
更新:
db.getCollection('noti').findOneAndUpdate(
{ _id: ObjectId("5bc061f05a4c0511a9252e88") },
{ $push: {
graph: {
"date" : ISODate("2018-10-24T08:55:13.331Z"),
"count" : 3.0
}
}
})
更新结果:
{
"_id" : ObjectId("5bc061f05a4c0511a9252e88"),
"count" : 1.0,
"color" : "green",
"icon" : "circle",
"graph" : [
{
"date" : ISODate("2018-10-24T08:55:13.331Z"),
"count" : 2.0
},
{
"date" : ISODate("2018-10-24T08:55:13.331Z"),
"count" : 3.0
}
],
"name" : "online visitor",
"read" : false,
"date" : ISODate("2018-10-12T08:57:20.853Z"),
"__v" : 0.0
}
首先，我尝试了这个代码
const peopleSchema = new mongoose.Schema({
name: String,
friends: [
{
firstName: String,
lastName: String,
},
],
});
const People = mongoose.model("person", peopleSchema);
const first = new Note({
name: "Yash Salvi",
notes: [
{
firstName: "Johnny",
lastName: "Johnson",
},
],
});
first.save();
const friendNew = {
firstName: "Alice",
lastName: "Parker",
};
People.findOneAndUpdate(
{ name: "Yash Salvi" },
{ $push: { friends: friendNew } },
function (error, success) {
if (error) {
console.log(error);
} else {
console.log(success);
}
}
);
但我注意到，只有第一个朋友(即约翰尼约翰逊)得到保存和目标，以推动数组元素在现有的“朋友”数组似乎不工作，因为当我运行代码，在数据库中只显示“第一个朋友”和“朋友”数组只有一个元素! 所以简单的解决方案写在下面
const peopleSchema = new mongoose.Schema({
name: String,
friends: [
{
firstName: String,
lastName: String,
},
],
});
const People = mongoose.model("person", peopleSchema);
const first = new Note({
name: "Yash Salvi",
notes: [
{
firstName: "Johnny",
lastName: "Johnson",
},
],
});
first.save();
const friendNew = {
firstName: "Alice",
lastName: "Parker",
};
People.findOneAndUpdate(
{ name: "Yash Salvi" },
{ $push: { friends: friendNew } },
{ upsert: true }
);
添加“{upsert: true}”在我的情况下解决了问题，一旦代码被保存，我运行它，我看到“朋友”数组现在有2个元素! 如果对象不存在，upsert = true选项将创建该对象。默认设置为false。
如果它不工作，使用下面的片段
People.findOneAndUpdate(
{ name: "Yash Salvi" },
{ $push: { friends: friendNew } },
).exec();
另一种使用Mongoose将项目推入数组的方法是- $addToSet，如果你只想将唯一的项目推入数组。$push操作符只是简单地将对象添加到数组中，无论该对象是否已经存在，而$addToSet仅在对象不存在于数组中时才这样做，以免合并重复。
PersonModel.update(
{ _id: person._id },
{ $addToSet: { friends: friend } }
);
这将查找您要添加到数组中的对象。如果发现，则不执行任何操作。如果不是，则将其添加到数组中。
引用:
$addToSet MongooseArray.prototype.addToSet（）
