gistfile1.js

var relations = {};
Meteor.Collection.prototype.relations = function(obj) {
  relations[this._name] = obj;
};

if (Meteor.isClient) {
  Meteor.subscribeReactive = function(name) {
    Meteor.subscribe(name);

    Deps.autorun(function() {
      // Meteor.subscribe(...)
    });
  };
}


if (Meteor.isServer) {

  Cursor = Object.getPrototypeOf(new Meteor.Collection('_void').find()).constructor;

  Cursor.prototype.join = function(name) {
    this._joins = name;
    return this;
  };


  Meteor.publishReactive = function(name, fn) {
    var cursor = fn();

    var collectionName = cursor._cursorDescription.collectionName;

    Meteor.publish(name, function() {
      return fn.apply(this, arguments);
    });

    Meteor.publish(name + '_' + cursor._joins, function() {
      return relations[collectionName][cursor._joins];
    });

  };

}