code: function(){
      var data = {};
      data = this.serializeData();
      data = this.mixinTemplateHelpers(data);
  
      var template = this.getTemplate();
      return Marionette.Renderer.render(template, data);
    }
docs: Render an individual model, if we have one, as part of a composite view (branch / leaf). For example: a treeview.