具有唯一模式键的 Mongoose 重复项

Question

我想让关键项目在该集合中独一无二，但我无法正常工作，我在这里发现了类似的问题。

task.js

function make(Schema, mongoose) {

    var Tasks = new Schema({
        project: { type: String, index: { unique: true, dropDups: true }},
        description: String
    });

    mongoose.model('Task', Tasks);
}
module.exports.make = make;

test.js

var mongoose = require('mongoose');
mongoose.connect('mongodb://localhost/rss');

var Schema = mongoose.Schema
  , ObjectId = Schema.ObjectId;

require('./task.js').make(Schema, mongoose);
var Task = mongoose.model('Task');
var newTask = new Task({
    project: 'Starting new project'
  , description: 'New project in node'
});
newTask.save(function(err) {
    if (err) console.log('Error on saving');
});

mongoose.disconnect();

当我使用节点 test.js 运行应用程序时，仍然会创建重复项。

MongoDB shell version: 2.0.2
connecting to: rss
> db.tasks.find()
> db.tasks.find()
{ "project" : "Starting new project", "description" : "New project in node", "_id" : ObjectId("4f21aaa3d48d4e1533000001") }
{ "project" : "Starting new project", "description" : "New project in node", "_id" : ObjectId("4f21aaa4d9a8921a33000001") }
{ "project" : "Starting new project", "description" : "New project in node", "_id" : ObjectId("4f21aaa57ebeea1f33000001") }

// 编辑还是同样的问题，这是我尝试做的 删除 db.tasks.drop() 集合 重启mongo sudo stop mongodb 并启动mongodb，再次运行程序还是同样的问题，它如何允许索引上的重复数据？

Answer 1

您传递的 Schema 对象可能无法正常工作，因为您将 'unique' 属性嵌套到 'index' 属性中，尝试这样的事情（它按预期工作）：

User = mongoose.model('User', new Schema({
    firstName:  {
        type:String,
        required: true,
    },
    lastName: {
        type:String,
        required: true,
    },
    email: {
        type:String,
        required: true,
        unique: true
    },
    address: String,
    phone: {
        type:String,
        required: true,
    },
    password:  {
        type:String,
        required: true,
        set: Data.prototype.saltySha1 // some function called before saving the data
    },
    role: String
},{strict: true}));

或者更具体地为您的示例：

var Tasks = new Schema({
    project: { 
        type: String, 
        unique: true,
        index: true
    },
    description: String
});

注意：我不知道您要对“dropDups”参数做什么，它似乎不在mongoose documentation 中。