如何通过javascript使用mongose从mongoDB中获取字段的值

Question

这是我的数据库newDb中users集合下的文档，

> db.users.find().pretty()
{
        "_id" : ObjectId("57025801593e301831ef3c72"),
        "country" : "U.S",
        "gender" : "Male",
        "lastName" : "Ks",
        "firstName" : "Balajee",
        "password" : "$2a$08$.Qts1uaOJiyH.A0LM9QeGOB1EBfItB2nV29RxLVbloDnzAggIuGf6",
        "email" : "[e-mail]",
        "position" : [
                "1",
                "2"
        ],
        "__v" : 1,
        "operation" : "add",
        "userip" : "11"}

如何从该文档中获取位置、操作和userip并将其用于执行函数？这是一个独立于主节点文件的Javascript文件中的函数。

function verifyOTP() {
    var position = user.position;
    var operation = user.operation;
    var useripp = user.userip;
    check(arr, position, operation, useripp);
}

Answer 1

如果使用mongoose，那么定义模型并使用它比使用原始集合要好得多。

首先在文件user.js:中定义一个模型

var mongoose = require('mongoose');
var Schema = mongoose.Schema;
var userSchema = new Schema({
  firstName: String,
  lastName: String,
  // TODO: add other required fields
});
mongoose.model('user', userSchema);
exports.userSchema = userSchema;

在validation.js中添加验证逻辑，例如：

exports.verifyOTP = function(user) {
  var position = user.position;
  var operation = user.operation;
  var useripp = user.userip;
  check(arr, position, operation, useripp); // TODO: what is arr?
};

在user-service.js中，添加以下代码：

var User = require('mongoose').model('user');
var validation = require('./validation');
var filter = { name: 'firstName' }; // TODO: use real filter here
var fields = 'position operation userip';
User
  .findOne(filter, fields)
  .then(validation.verifyOTP)
  .catch(err => console.log(err));

Answer 2

试试这个：

var Helper = require('path_to_the_module_where_the_method_check_is_defined_and_exported');
function verifyOTP(user) {
    var position = user.position;
    var operation = user.operation;
    var useripp = user.userip;
    Helper.check(position, operation, useripp);
};
var query = {
    // Your query here
};
var projection = {
     position: 1,
     operation: 1,
     userip: 1,
     _id: 0
};
User.findOne( query, projection, function(err, user) {
    if(err) console.log("Error: " + JSON.stringify(err));
    if(user) verifyOTP(user);
});