Question

使用mongoose 4.9.4，我有两个模型，一个用户模型和一个客户模型。

客户始终附加到用户（用户1-n客户）。

现在要在前面创建一个Customer，我使用表单中的下拉列表从用户中选择一个唯一属性（称为＆＃34; trigramUser＆＃34;），使用此属性检索用户objectId并传递它是新人的一个属性。

createCustomer方法：

使用属性＆＃34; trigramUser＆＃34;
将此objectId转换为字符串（id.str）
替换req.body.userCustomer属性以使用objectId作为字符串创建新客户

customerController.js

exports.createCustomer = (req, res) => {
    console.log('Creation of the customer '+req.body.siretCustomer+' in progress.');
    console.log('Worker attached to the customer '+req.body.userCustomer+' .');
    database.getConnection();
    user.findOne( { trigramUser: req.body.userCustomer } , '_id', (err, id) => {
        var newCustomer = {
            sireCustomer          : req.body.siretCustomer,
            // attributes...
            userCustomer          : id.str
    };
    console.log('ID worker : '+id.str+' .');
    customer.create(newCustomer, (err) => {
        if (err) return res.status(500).json(err.stack);
        res.status(200).json(
            { message: 'Customer '+req.body.siretCustomer+'
             has been successfully created.' }
        );
        });
    });
};

customer.js

var mongoose = require('mongoose'), Schema = mongoose.Schema;

var customerSchema = new Schema({
  siretCustomer:
    { type: String, required: true, minlength: 15, maxlength: 15 },
  // attributes ...
  userCustomer:
    [{ type: Schema.Types.ObjectId, ref: 'User' }],
}, { collection: 'customer' });

module.exports = mongoose.model('Customer', customerSchema, 'customer');

user.js的

var mongoose = require('mongoose'), Schema = mongoose.Schema;

var userSchema = new Schema({
    trigramUser:
        { type: String, required: true },
    // attributes...
    customersUser:
        [{ type: String, ref: 'Customer'}]
}, { collection: 'user'});

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

但是，对于createCustomer方法，控制台会在我提交表单时显示：

Creation of the customer 987987987987987 in progress.
Worker attached to the customer PLD .
ID worker : undefined .

因此req.body.userCustomer到达user.find({}, '_id',方法。现在，如果我用Mongo写作：

db.user.findOne({trigramUser:'PDL'})._id.str;

输出为5988897d7b55ba0548d95da6。

为什么当我在方法user.findOne({trigramUser: req.body.userCustomer}, '_id',中打印req.body.userCustomer（字符串＆＃39; PDL＆＃39;）时，字符串为空且查询无效？

Mongoose - 使用属性检索ObjectId并将其传递给插入

0 个答案: