Multi list section with Backbone collections in Titanium

multi-listsection.js

function prepareItem(data) {
    var item = {
        properties: {
            itemId: data.get('id')
        },
        template: 'default',
        title: {
            text: "undefined" != typeof data.get("title") ? data.get("title") : ''
        }
    };
    if (OS_IOS) {
        item.properties.selectionStyle = Ti.UI.iPhone.ListViewCellSelectionStyle.NONE;
    }
    return item;
}

function setup() {
    var items = {},
        sections = [],
        collection = Alloy.Collections.instance('your_model'),
        viewTSS = $.createStyle({
            classes: ['sectionClass']
        }),

    // always re-sort using the backbone comparator
    collection.sort();

    _.each(collection.models, function(item, index) {
        // divide data into sections
        var unique = item.get('<section_id>').toString();

        if (!items[unique]) {
            items[unique] = {
                "allitems": []
            };
        }

        items[unique].allitems.push(prepareItem(item));
    });

    _.each(items, function(elm, index) {
        var view = Ti.UI.createView(),
            label = Ti.UI.createLabel({
                text: index
            });

        view.applyProperties(viewTSS);
        view.add(label);

        var section = Ti.UI.createListSection({headerView: view});
        section.setItems(elm.allitems);
        sections.push(section);
    });

    $.yourlistview.setSections(sections);
}