folder.hbs

<div class="folder" data-template-name="folder">
    <h5>Sous-dossiers ({{childrenFolders.length}})</h5>
    <ul class="bullet-list">
        {{#each childrenFolders}}
            <li>{{name}}</li>
        {{/each}}
    </ul>
</div>

// Mapping:

DS.RESTAdapter.map('App.Folder', {
    collection: { embedded: 'load' }
});

App.Folder = DS.Model.extend({
    name: DS.attr('string'),
    parentFolder: DS.belongsTo('App.Folder'),
    childrenFolders: DS.hasMany('App.Folder'),
    files: DS.hasMany('App.File'),
    createdAt: DS.attr('date'),
    isDeleted: DS.attr('boolean')
});

DS.RESTAdapter.map('App.Folder', {
parentFolder: { embedded: 'load' },
childrenFolders: { embedded: 'load' },
files: { embedded: 'load' }
});