Mongo only inserts first object inside promise, how to see error?

help
1

hi,

I have a method, and this uses a promise to get external data (this works perfectly).

  • The first database insert works fine (for testing purposes)
  • but if I do it inside the loop of my promise he only inserts the first. And I suspect an error but how can I see the error?
  • if I remove the mondoDB Apps.insert statement it prints the name of all my objects… so it goes wrong here

thank you!

updateAppsCollection(){
    		console.log('Method: update the local mongoDB with fresh data from Qlik Sense');
    		Apps.remove();
    		**Apps.insert({**
    **			"id": "05ebb949-ab3d-496a-a5d9-779115bb1c0a",**
    **			"name": "test1",**
    **		});**

    		var myPromise = qrs.get( '/qrs/app/full')  //this REST api function returns a promise
    		.catch(err => {
    			throw new Meteor.Error(err)
    		})
    		myPromise.then(function(docList){
    			docList.forEach(function(doc) {
    				**console.log('inserted ', doc);**
**    				Apps.insert(doc);**
    			})
    		}).catch(err => {
    			throw new Meteor.Error(err)
    		})
    	}
2

In the console try this:

meteor mongo
db.apps.drop() //maybe it is a problem of IDs

then try to change your code like this:

myPromise.then(function(docList){
Apps.insert(docList);
}).catch(err => {

You have a list of documents, you can insert it all in one instruction COLLECTION.insert([ARRAY OF DOCUMENTS]);

3

Thank you. It is so strange…

  • When I console.log the doclist it shows all items.
  • But when I try to insert it into the database nothing happens. (some error which I can’t see apparently)

This is now my code

updateAppsCollection(){
		console.log('Method: update the local mongoDB with fresh data from Qlik Sense');
		
		try{
			Apps.remove();
		}
		catch(error){console.log(err)};

		var myPromise = qrs.get( '/qrs/app/full');
		
		myPromise.then(
			function(docList){					
				try{
					console.log('try to insert document array into mongo');					
					Apps.insert(docList);		
					console.log('inserted document ', docList);				
				}
				catch(error){console.log(err)}

			}, function (error) {
   				 console.error('uh oh: ', error);   // 'uh oh: something bad happened’
   				});

		myPromise.catch(function(error) {
			console.log('Caught!', error);
		});

	}

Console output
=> Started your app.

=> App running at: http://localhost:3000/
   Type Control-C twice to stop.

I20160523-11:24:34.400(2)? Meteor server has started. Calling updateAppsCollection
I20160523-11:24:34.400(2)? Method: update the local mongoDB with fresh data from Qlik Sense
I20160523-11:24:35.128(2)? try to insert document array into mongo
4

you can try this:

try{
	console.log('try to insert document array into mongo');
	Apps.insert(docList, 
                   function(err,res){
                        console.log("insert error: ",err); 
                        console.log("insert result: ",res);
                   }
        );
    console.log('inserted document ', docList);	
}

if the problem remains please log the docList in the console before Apps.insert

5

Thank you, the output remains the same… Looks like the callback is never called? that would also explain why I never get an error!

Meteor server has started. Calling updateAppsCollection
Method: update the local mongoDB with fresh data from Qlik Sense
try to insert document array into mongo
6

If I try to log the doclist i get, (the doclist contains 140 documents each has 14 lines of code)

FATAL ERROR: Evacuation Allocation failed - process out of memory

8

Please note that it also not works if I just do app.insert({name: ‘test’})

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9

Are you expecting an insert on an array of n documents to insert n distinct documents into the collection?

It will insert one document. For example:

const names = [
  { name: 'Bob' },
  { name: 'Carol' },
  { name: 'Ted' },
  { name: 'Alice' },
];
Names.insert(names);

$ meteor mongo
meteor:PRIMARY> db.names.find()
{ "_id" : "qBoe45WTv9zyQospk", "0" : { "name" : "Bob" }, "1" : { "name" : "Carol" }, "2" : { "name" : "Ted" }, "3" : { "name" : "Alice" } }

If you need to insert separate documents, you will have to iterate over the list:

names.forEach(doc => {
  Names.insert(doc);
});

$ meteor mongo
meteor:PRIMARY> db.names.find()
{ "_id" : "ZFX7bRtFQsKc8wgXN", "name" : "Bob" }
{ "_id" : "vGQJozwovzjMHMYJt", "name" : "Carol" }
{ "_id" : "6g8vJSW3u9vjrWKho", "name" : "Ted" }
{ "_id" : "bzxWtR5EtToH8Pbdp", "name" : "Alice" }
10

I think that you have too many data to insert in the DB, please try this (just to test):

try{
	console.log('try to insert document array into mongo');
    var arr=[ docList[0], docList[1], docList[2] ];
	Apps.insert(arr, 
                   function(err,res){
                        console.log("insert error: ",err); 
                        console.log("insert result: ",res);
                   }
        );
    console.log('inserted document ', arr);	
}

if this works, you can try to follow this: Inserting 50000 documents into a collection

11

Thank you. Tried that as well. the issue here is basically. In my promise, meteor will not insert anything. even not

Apps.insert({name: ‘test’})

I suspect the callback never returns

12

I think it is a bug in meteor

  • the error logging was very strange, I noticed different behaviours also when restarting the server
  • If I try the same code on the client it works perfectly… (I still have autopublish on)

This code works client side:

Meteor.call('getApps', function(error, docList){
   if(error){
    console.error(error);
  }
  else{
    console.log('try to insert document array into mongo', docList);
    Apps.remove();
    docList.forEach(function(doc) {
     console.log('insered '+doc.qDocName);
     Apps.insert(doc, 
       function(err,res){
         console.log("insert error: ",err); 
         console.log("insert result: ",res);
       });
   })
  }

});

Get apps on the server

Meteor.methods({  
	generateStreamAndApp (customers, templateAppGuid) {
		check(customers, Array);
		check(templateAppGuid, String);
		return generateStreamAndApp(customers, templateAppGuid);
	},
	getApps () {
		return new Promise((resolve, reject) => {
			qsocks.Connect(engineConfig)
			.then(function(global) {
				global.getDocList().then(function(docList) {
					resolve(docList) ;
				});
			})
		})
		.catch(err => {
			throw new Meteor.Error(err)
		})
	},
13

So will this bug be solved somehow?

14

Do you have a repo I can install?

15

Hi, i can try to zip my project and send you an url?

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