如何通过猫鼬使用mongoose从mongoDB获取字段的值

Question

This is a document under the collection users in my database newDb ,

> db.users.find().pretty()
{
        "_id" : ObjectId("57025801593e301831ef3c72"),
        "country" : "U.S",
        "gender" : "Male",
        "lastName" : "Ks",
        "firstName" : "Balajee",
        "password" : "$2a$08$.Qts1uaOJiyH.A0LM9QeGOB1EBfItB2nV29RxLVbloDnzAggIuGf6",
        "email" : "balajee41@gmail.com",
        "position" : [
                "1",
                "2"
        ],
        "__v" : 1,
        "operation" : "add",
        "userip" : "11"}

How can I fetch position,operation and userip from this document and use it for executing a function? This is a function in a separate Javascript file apart form the main node file.

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

Answer 1

Try this:

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);
});

Answer 2

If you use mongoose it's much better to define model and work with it, than with raw collection.

First of all define a model in file user.js :

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;

Add validation logic in validation.js for example:

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?
};

And in user-service.js , add the following code:

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));