Emit custom event from each store

[creative-eye]

We could emit specific events on each store, instead of the standard this.emitChange(). This might be useful if we have multiple things updating at once, but are interested only in a specific change. What do you think?

[jrust]

This is fixed in 3.0.0 since you can now listen for changes on a specific leaf of your data tree. e.g.: a store that has the following state:

initialize: function() {
  this.state = this.immutable({ selectedColor: 'blue', colors: ['green', 'blue'] });
}

And in the controller:

// Listen only for changes to selectedColor
$scope.$listenTo(colorStore, ['selectedColor'], yourCallback);

Alternatively, you could also look at the paths changed since that is passed to callbacks that listen to all changes on a store:

$scope.$listenTo(colorStore, function(e) {
  if (_.includes(e.data.paths, ['selectedColor'])) {
    // selectedColor has changed
  }
});

See the baobab docs on events for more details.