title: get model by html element in angular2
body: <p>I need to access the model by the html element in angular2. In my case I use ng2-dragula to perform drag and drop and its service only has access to the html elements that are dragged. And I need to update the corresponding model of the element. Heres the issue at <a href="https://github.com/valor-software/ng2-dragula/issues/173" rel="noreferrer">github</a>. </p>