How to: find some component at canvas, on event "component:add"

Thanks for your attention. 
I just read the doc.
And ended up with this solution:


 editor.on('component:add', function(currentComp) {  
 
        if (currentComp.attributes.tagName == "form"){

            var modelList =  (domComps.getComponents()).models;            
            var presentForms = modelList.filter(function(component) {
              return component.attributes.tagName == "form";
            }); 
            
            if (presentForms.length > 1){
                //console.log("canvas have > 2 forms");
                implodeComponents(currentComp, presentForms);
            }
        }
	});