Meteor - no more callbacks for "findOne" function
meteor, mongodb
Solution
`findOne(yourId)` is a sync method which is equivalent to `find({ _id: yourId}, callback)`. The difference is that `find()` allows you to define a callback. If you don't pass a callback to `find()` this method will be sync.
check wrapAsync: http://docs.meteor.com/#/full/meteor_wrapasync It allows you to code in a `sync` style with a `async` operations.
Free lesson on EventedMind: https://www.eventedmind.com/feed/meteor-meteor-wrapasync
Problem
i'm working on a Meteor project, and I must say that isn't easy at all, especially for one thing: callbacks ! Everything is async, so I wonder how do I must do to get results from my mongodb. ``` var user = Meteor.users.findOne({username: "john"}); return (user); // sometimes returns "undefined" ``` ... ``` var user = Meteor.users.findOne({username: "john"}); if (user) // so ok, I check if it exists! return (user); // Cool, I got my user! return (); // Ok and what should I return here? I want my user! ``` I don't want to be dirty and put like setTimeout everywhere. Anybody has a solution for this ? EDIT : I noticed in router.js with console.log that my data is returned 4 times. 2 times with an undefined value and 2 other times with the expected value. In the view, it's still undefined. Why the router passes like 4 times in this route ? Does it display the first result of the return value in the router ? What should I return if the find() doesn't find anything ? EDIT 2: Here is some code to understand. ``` this.route('profilePage', { path: 'profil/:_id?', waitOn: function() { return [ Meteor.subscribe('article', { prop: this.params._id}), // id can be id or username Meteor.subscribe('article', { userId: this.params._id}), // id can be id or username Meteor.subscribe('params'), Meteor.subscribe('profil', (this.params._id ? this.params._id : Meteor.userId())) ]; }, data: function() { if (this.params._id) { var user = Meteor.users.findOne(this.params._id); if (!user) user = Meteor.users.findOne({username: this.params._id}); console.log(user); return user; } else if (Meteor.userId()) return Meteor.user(); else Router.go("userCreate"); } }); ``` I get this on the console: http://puu.sh/debdJ/69419911f7.png (text version following) ``` undefined undefined Object_id: "o3mgLcechYTtHPELh"addresses: (....) Object_id: "o3mgLcechYTtHPELh"addresses: (....) ```