Meteor "Join" -- Note that this code is *not* production ready.

gistfile1.coffee

Meteor.publish 'paths', (since) ->
  pointHandles = {}
  publishPath = (pathId) => 
    pointHandles[pathId] = Points.find({pathId: pathId}).observe
      added: (obj) =>
        @set('points', obj._id, obj)
        @flush()
      
      # these two should never happen
      changed: (obj) =>
        @set('points', obj._id, obj)
        @flush()
      
      removed: (old_obj) =>
        @unset('points', old_obj._id, _.keys(old_obj))
        @flush()
      
  
  pathHandle = Paths.find({createdAt: {$gt: since}}).observe
    added: (obj) =>
      @set('paths', obj._id, obj)
      @flush()
      publishPath(obj._id)
    
    # in general this should be smarter, but shouldn't happen much
    changed: (obj) =>
      @set('paths', obj._id, obj)
      @flush()
    
    # this should never happen, but just in case
    removed: (old_obj) =>
      pointHandles[old_obj._id].stop()
      @unset('paths', old_obj._id, _.keys(old_obj))
      @flush()
  
  @complete()
  @flush()
  
  @onStop =>
    handle.stop() for handle in pointHandles
    pathHandle.stop()