EmberJS Helper to dynamically call components

I have a model which have a relationship with several type of model inside the same property (folder: subfolder and item).

I wonder how to render children of the model without using

{{#if item.isFolder}}
    {{#folder-item folder=item parent=this}}{{/folder-item}}
{{/if}}

{{#if item.isPage}}
    {{#page-item page=item parent=this}}{{/page-item}}
{{/if}}