Question

What does the following error message mean?

fence has already activated — too late to add writes

Here’s an example of how to get it:

Environment:

• Mac OS X Lion
• Meteor 0.3.8

Project creation:

meteor create test
cd test
meteor add coffeescript http
mv test.js test.coffee
meteor

test.coffee:

Records = new Meteor.Collection("records")

if Meteor.is_client
    Meteor.startup ->
        Meteor.call "test"

if Meteor.is_server
    Meteor.methods
        test: ->
            Meteor.http.get "http://www.meteor.com", ->
                Records.insert some:"data"

Answer 1

Once the method is done executing you can’t add additional writes. To delay completing the methods you can use Futures. Something like this:

Meteor.methods({
  foo: function() {
    var futures = _.map(urls, function(url) {
      var future = new Future();
      var onComplete = future.resolver();

      Meteor.http.get(url, function(error, result) {
        // do whatever you need

        onComplete();
      });

      return future;
    });

    Future.wait(futures);
  }
});