Question

When my “chartModel” changes I want to update the “globalModel”.

chartModel.bind("change", updateGlobalModel);

updateGlobalModel(){
  globalModel.set(obj)
}

And vice versa, I want my chartModel to update when the globalModel changes.

globalModel.bind("change", updateChartModel);

updateChartModel(){
  chartModel.set(obj)
}

This results in a feedback loop when setting the globalModel. I could prevent this by setting {silent:true}.

But here comes the problem. I have another Model that is dependent on the change event:

globalModel.bind("change", updateOtherModel);

How can I alert this model of the change but not the former one (to avoid the feedback loop)?

UPDATE:
For now, I decided to generate a specific ID for each set call:

set : function(attrs, options) { 
        if(!("setID" in attrs)){
            attrs.setID = myApp.utils.uniqueID(); //newDate.getTime();
        }
        Backbone.Model.prototype.set.call(this, attrs, options);
    },

This way, I can always generate a “setID” attribute from anywhere in my application. If the setID is still the same when fetching something from the model, I know there could be risk for a feedback loop.

Answer 1

My knowledge is limited, so maybe I shouldn’t be answering, but I would try to pass a reference to chartModel when it’s created that refers to the “other” model that you want updated. Then trigger an event on updateChartModel() and make sure your “other” model is bound on that event.

The question I have is: does the silent object mute all events? Or just model related ones? This obviously wouldn’t work if all events are muted.