Skip to main content

Transaction

fawn​

  • Fawn uses 2 phase commit to mimic a transaction
  • Provides the ability to carry out edits on a mongoDB database as a series of steps
$ npm install fawn
var Fawn = require("fawn");
var mongoose = require("mongoose");
mongoose.connect("mongodb://127.0.0.1:27017/testDB");
 
Fawn.init(mongoose);

//Create a transaction task
var task = Fawn.Task();
task.update("Accounts", {firstName: "John", lastName: "Smith"}, {$inc: {balance: -20}})
    .update("Accounts", {firstName: "Henry", lastName: "Miller"}, {$inc: {balance: 20}})
    .run()
    .then(function(results){
    var firstUpdateResult = results[0];
    var secondUpdateResult = results[1];
    res.status(200).send('Operation Successful');
  })
  .catch(function(err){
    // if there is any error,roll back entirely
    // log the error which caused the failure
    console.log(err);
    res.status(500).send('Operation Failed', err);
  });