remoteDS.add('MinixLi1986@bignerdranch.com',{emailAddress: 'MinixLi1986@bignerdranch.com',coffee: 'espresso'});

Frontend Web Development: The Big Nerd Ranch Guide Chapter 13: Ajax
1

Hi!

I try following code to run from console

var remoteDS = new App.RemoteDataStore(“http://coffeerun-v2-rest-api.herokuapp.com/api/coffeeorders”);
remoteDS.add(‘MinixLi1986@bignerdranch.com’,{emailAddress: ‘MinixLi1986@bignerdranch.com’,coffee: ‘espresso’});

  1. {errmsg: “This MongoDB deployment does not support retryable… add retryWrites=false to your connection string.”, originalError: {…}, name: “MongoError”}

  2. errmsg: “This MongoDB deployment does not support retryable writes. Please add retryWrites=false to your connection string.”

  3. name: “MongoError”

  4. originalError: {operationTime: “6842960496937664513”, ok: 0, errmsg: “Transaction numbers are only allowed on storage engines that support document-level locking”, code: 20, codeName: “IllegalOperation”, …}

  5. proto: Object

2

Hello,

It seems I’m facing the same issue:

I try next code in the console:

var remoteDS = new App.RemoteDataStore("http://coffeerun-v2-rest-api.herokuapp.com/api/coffeeorders");
remoteDS.add('a@b.com', {emailAddress: 'c@j.com', coffee: 'black coffee'});

And I’m getting:

1. errmsg: "This MongoDB deployment does not support retryable writes. Please add retryWrites=false to your connection string."
2. name: "MongoError"

Thanks for your help!

Cristian Jáuregui S.

3

I am facing the same issue after disabling CORS in Chrome by launching it from the command line as follows:
C:\Program Files (x86)\Google\Chrome\Application\chrome.exe" --disable-web-security --user-data-dir=~/chromeTemp

Is there a fix for this???

This chapter and the next are rather useless if not :frowning:

4

same error too. The status code is 200 yet. I have tried with Chrome and Firefox. Can any instructor of the book explain why?

5

Same issue. I imagine they have to fix this on their end when they connect to MongoDB. Maybe it’s a MongoDB 4.2 issue since the default for retryWrites is true?

6

If you want to start Chapter 14, and you want to use DataStore, you can use the following to mimic the Promise and delay of Ajax calls:

(function(window) {
  'use strict';

  var App = window.App || {};
  var Promise = window.Promise;

  function DataStore() {
    this.data = {};
  }

  function promiseResolvedWith(value, sideEffect) {
    var promise = new Promise(function(resolve, reject) {
      setTimeout(function() { // Add fake network delay
        if (sideEffect) {
          sideEffect();
        }
        resolve(value);
      }, 2000);
    });

    return promise;
  }

  DataStore.prototype.add = function(key, val) {
    return promiseResolvedWith(null, function() {
      this.data[key] = val;
      console.log('added data');
    }.bind(this));
  };

  DataStore.prototype.get = function(key) {
    return promiseResolvedWith(this.data[key], null);
  };

  DataStore.prototype.getAll = function() {
    return promiseResolvedWith(this.data, null);
  };

  DataStore.prototype.remove = function(key) {
    return promiseResolvedWith(null, function() {
      delete this.data[key];
      console.log('removed data');
    }.bind(this));
  };

  App.DataStore = DataStore;
  window.App = App;
})(window);