title: node js mongo db dependencies (doc not being found)
body: <p>I have the following code:</p>
  
  <pre><code>var method = PushLoop.prototype;
  var agent = require('./_header')  
  var request = require('request');
  var User = require('../models/user_model.js');
  var Message = require('../models/message_model.js');
  var async = require('async')
  
  function PushLoop() {};
  
      method.startPushLoop = function() {
  
       getUserList()
  
      function getUserList() {        
  
          User.find({}, function(err, users) {            
              if (err) throw err;
              if (users.length &gt; 0) {              
                   getUserMessages(users) 
              } else {              
                  setTimeout(getUserList, 3000)
              }                   
          });
      }
  
      function getUserMessages(users) {
           // console.log("getUserMessages")
           async.eachSeries(users, function (user, callback) {
  
                var params = {
                    email: user.email,
                  pwd: user.password,
                  token: user.device_token
                }                       
                    messageRequest(params)                             
                callback(); 
              }, function (err) {
                if (err) {
                  console.log(err)
                      setTimeout(getUserList, 3000)                
                }               
              });
      }
  
      function messageRequest(params) {
  
              var url = "https://voip.ms/api/v1/rest.php?api_username="+ params.email +"&amp;api_password="+ params.pwd +"&amp;method=getSMS&amp;type=1&amp;limit=5"                                      
              request(url, function(err, response, body){ 
  
                  if (!err) {
  
                      var responseObject = JSON.parse(body);                                          
                  var messages = responseObject.sms   
  
                      if (responseObject["status"] == "success")  {                                                                                                               
                          async.eachSeries(messages, function(message, callback){     
                            console.log(params.token)         
                              saveMessage(message, params.token)
                              callback();
  
                          }, function(err) {
                              if (err) {
                                  console.log(err)
                              }
                              // setTimeout(getUserList, 3000)                            
                          })
                      } else {
                          // setTimeout(getUserList, 3000)    
                      }
                  } else {
                      console.log(err)
                      // setTimeout(getUserList, 3000)
                  }           
  
              });
              setTimeout(getUserList, 3000)
      }
  
      function saveMessage(message, token) {
           // { $and: [ { price: { $ne: 1.99 } }, { price: { $exists: true } }
          // Message.find({ $and: [{ message_id: message.id}, {device_token: token}]}, function (err, doc){             
              Message.findOne({message_id: message.id}, function (err, doc){
  
            if (!doc) {                    
                    console.log('emtpy today')                
                      var m = new Message({
                            message_id: message.id, 
                            did: message.did,
                            contact: message.contact, 
                            message: message.message,
                            date: message.date,
                            created_at: new Date().toLocaleString(),
                            updated_at: new Date().toLocaleString(),
                            device_token: token    
                          });             
                        m.save(function(e) {
                              if (e) {                                
                                  console.log(e)
                              }   else {
                                   agent.createMessage()               
                                    .device(token)
                                    .alert(message.message)
                                    .set('contact', message.contact)
                                    .set('did', message.did)
                                    .set('id', message.id)
                                    .set('date', message.date)
                                    .set('message', message.message)                    
                                    .send();                                
                              }                                       
                          });       
            }                                                     
          }) //.limit(1); 
      }
  
  };
  
  module.exports = PushLoop;
  </code></pre>
  
  <p>Which actually works perfectly fine in my development environment - However in production (i'm using Openshift) the mongo documents get saved in an endless loop so it looks like the (if (!doc)) condition always return true therefore the document gets created each time. Not sure if this could be a mongoose issue - I also tried the "find" method instead of "findOne". My dev env has node 0.12.7 and Openshift has 0.10.x - this could be the issue, and i'm still investigating - but if anybody can spot an error I cannot see in my logic/code please let me know</p>
  
  <p>thanks!</p>