Issue when using idGeneration: 'MONGO'

[dpatte]

While using this module I sometimes get the following error

Exception in defer callback: Error: Future resolved more than once
I20160114-15:20:42.939(-5)?     at Object.Future.return (/home/dpatte/.meteor/packages/meteor-tool/.1.1.10.6elsyt++os.linux.x86_64+web.browser+web.cordova/mt-os.linux.x86_64/dev_bundle/server-lib/node_modules/fibers/future.js:226:10)
I20160114-15:20:42.939(-5)?     at TrackerInstance._runFlush (packages/peerlibrary_server-autorun/packages/peerlibrary_server-autorun.js:186:1)
I20160114-15:20:42.939(-5)?     at packages/peerlibrary_server-autorun/packages/peerlibrary_server-autorun.js:104:1
I20160114-15:20:42.939(-5)?     at packages/peerlibrary_server-autorun/packages/peerlibrary_server-autorun.js:90:1
I20160114-15:20:42.939(-5)?     at [object Object]._.extend.withValue (packages/meteor/dynamics_nodejs.js:56:1)
I20160114-15:20:42.939(-5)?     at packages/meteor/timers.js:6:1
I20160114-15:20:42.939(-5)?     at runWithEnvironment (packages/meteor/dynamics_nodejs.js:110:1)

I am using calls to Meteor.user().find and .findOne in my publish function. Could this be an issue?

[mitar]

Please create a reproduction. I do not get such errors and I cannot really help much without something to work here.

One thing to have in mind here is that such errors can occur when there are some other error conditions happening. So because things are asynchronous one side can fail, resolve the future as failure, while something else keeps running and tries to resolve it later again.

I am using calls to Meteor.user().find and .findOne in my publish function. Could this be an issue?

It shouldn't be, but maybe it is. Please make a reproduction.

[mitar]

Ping?

[dpatte]

Sorry for the delay, but I have switched to Reywood:Publish-Composite now, which seems to handle my use case better for me.

[mzygmunt]

I've the same issue.

Exception in defer callback: Error: Future resolved more than once
I20160313-23:24:54.901(1)? at Object.Future.return (/Users/mzygmunt/.meteor/packages/meteor-tool/.1.1.11-faster-rebuild.0.d7n8jc++os.osx.x86_64+web.browser+web.cordova/mt-os.osx.x86_64/dev_bundle/server-lib/node_modules/fibers/future.js:226:10)
I20160313-23:24:54.901(1)? at TrackerInstance._runFlush (packages/peerlibrary_server-autorun/packages/peerlibrary_server-autorun.js:186:1)
I20160313-23:24:54.901(1)? at packages/peerlibrary_server-autorun/packages/peerlibrary_server-autorun.js:104:1
I20160313-23:24:54.901(1)? at packages/peerlibrary_server-autorun/packages/peerlibrary_server-autorun.js:90:1
I20160313-23:24:54.902(1)? at [object Object]._.extend.withValue (packages/meteor/dynamics_nodejs.js:56:1)
I20160313-23:24:54.902(1)? at packages/meteor/timers.js:6:1
I20160313-23:24:54.902(1)? at runWithEnvironment (packages/meteor/dynamics_nodejs.js:110:1)

Here is my source of publish func:

Meteor.publish('test', function () {
    this.autorun(function (computation) {
        let token = self._token.get(); //get token string
        let objID = new Meteor.Collection.ObjectID((token));
        return Sessions.find({_id: objID});
    })
});

[mitar]

Can you create a reproduction?

[mzygmunt]

test.js

Books = new Mongo.Collection('books', {idGeneration: 'MONGO'});

if (Meteor.isClient) {
    Meteor.subscribe('books');

    Template.test.helpers({
        books: function () {
            return Books.find();
        }
    });

    Template.test.events({
        'click #showComedies': function () {
            Meteor.call('showComedies');
        },
        'click #showHorrors': function () {
            Meteor.call('showHorrors');
        }
    });
}

if (Meteor.isServer) {
    let cat = new ReactiveVar('comedy');

    Meteor.methods({
        showComedies: function () {
            cat.set('comedy');
        },
        showHorrors: function () {
            cat.set('horror');
        }
    });

    Meteor.publish('books', function () {
        this.autorun(function (computation) {
            return Books.find({cat: cat.get()});
        });
    });

    Meteor.startup(function () {
        Books.remove({});
        Books.insert({title: 'Book 1', cat: 'comedy'});
        Books.insert({title: 'Book 2', cat: 'comedy'});
        Books.insert({title: 'Book 3', cat: 'horror'});
        Books.insert({title: 'Book 4', cat: 'comedy'});
        Books.insert({title: 'Book 5', cat: 'horror'});
    });
}

<head>
    <title>test</title>
</head>

<body>
{{> test}}
</body>

<template name="test">
    <button id="showComedies">Show comedies</button>
    <button id="showHorrors">Show horrors</button>
    <ul>{{#each books}}
        <li>{{title}}</li>
    {{/each}}</ul>
</template>

And please click "Show horrors".

It seems {idGeneration: 'MONGO'} and default MongoID causes problem. With default Meteor's ids all works fine.

[mitar]

Sorry, by reproduction I meant a repository I can clone and run. See documentation here. In this way it will really simplify the amount of work I have to do, but I do understand that it requires a bit more work on your side.

[mzygmunt]

Here you are.

https://github.com/mzygmunt/reactive-publish-bug.git

[mitar]

Hm, how often does it happens? I cannot reproduce it.

[mitar]

Can anyone else reproduce it?

[dpatte]

This is what I saw as well.

[mitar]

@dpatte: Can you elaborate a bit? Do you see with this repository an error or not when you click the button? Every time?

Which operating system are you using? Are you just running meteor or some other version of Meteor?