Newbie working with JSON reader and nested JSON

[WTRambo]

I am trying to make a store that reads "cart-items" out of the following JSON:

{
    "request-status": "success",
    "session-token": "8259984ckur9678d82grfiujn7",
    "response-data": {
        "cart": {
            "cart-items": [
                { ... },
                { ... }
...

The store I have looks like this:

var theStore = Ext.create('Ext.data.Store', {
            model:'CartItems',
            autoLoad: true,
            proxy: {
                type: 'ajax',
                url: 'data/cart.json',
                reader: {
                    type: 'json',
                    root: 'response-data',
                    record: 'cart-items'
                }
            },

Now I am pretty sure I am getting no data back because there is the 'cart' level JSON between the 'response-data' and the 'cart-items'. I can't rearrange the JSON easily, is there a way to do this or do I need to look into a custom reader for this?

Thanks,
Rambo.

[Zyphrax]

I believe that you can use a function for root as well:

root:function(item){return item['response-data']['cart'] };

Haven't tested it, but I remember using something like this in one of my Sencha Touch 1 apps.

[WTRambo]

That worked, thanks!