Accessing nested objects in JSON feed - Sencha Touch

I'll begin with the usual disclaimer: new to Sencha Touch/working with JSON, floundering in the dark. Any help or prodding in the right direction is appreciated 开发者_StackOverflow社区more than you know!

I'm trying to get my app to fetch data from a public Google Spreadsheet JSON feed. From what I've managed to figure out, my current model is based on JSON arrays, NOT nested objects. How do I access and return a nested object?

Ext.regModel('Count', {
    fields: [{name:'$t'}]

});

this.list = new Ext.List({
            itemTpl: new Ext.XTemplate('<div>{$t}</div>'),
            loadingText: false,
            store: new Ext.data.Store({
                model: 'Count',
                proxy: {
                    type: 'scripttag',
                     url :  'http://spreadsheets.google.com/feeds/cells/0AuYDRk91MX8-dHhkV29ZVkRGNjlvZjV4QVBIVmJubVE/odb/public/basic?range=A1&alt=json',
                    reader: {
                        type: 'json',
                        root: 'feed'
                    }
                }
            })
        });

The JSON data (extra stuff removed, above link will show all of it if need be, contains an email address I'd rather not post and have indexed):

{
    "feed":{
        "entry":[{
            "content":{
                "type":"text",
                "$t":"11"
            }
        }]
    }
}

If I plop in another JSON feed that uses arrays I can work with it just fine, but just can't figure out what I need to do to access that integer in the object that corresponds to $t. If I put "entry" as the root instead of "feed," I get an error that reads, "Uncaught TypeError: Cannot read property 'length' of undefined."

The solution! Turns out Sencha didn't like the $ in my template variable.

Ext.regModel('Count', {
    fields: [{name:'count', mapping:'content.$t'}]

});

this.list = new Ext.List({
            itemTpl: new Ext.XTemplate('<div>{count}</div>'),
            loadingText: false,
            store: new Ext.data.Store({
                model: 'Count',
                proxy: {
                    type: 'scripttag',
                     url :  'http://spreadsheets.google.com/feeds/cells/0AuYDRk91MX8-dHhkV29ZVkRGNjlvZjV4QVBIVmJubVE/odb/public/basic?range=A1&alt=json',
                    reader: {
                        type: 'json',
                        root: 'feed.entry'
                    }
                }
            })
        });