How do I get data from a store which uses a model with HasMany lists?

Hello folks:

I'm trying to view data in a model via a JSON proxy which has several list in it.

My model looks like this:

Code:

Ext.define('PeakDay.model.MainGridModel', {
    extend: 'Ext.data.Model',

    requires: [
        'Ext.data.Field'
    ],

     
    hasMany: [
        {
            name: 'cisoSystemLoadModelList',
            model:'CISOSystemLoadModel',
            associationKey:'cisoSystemLoadModelList'
        },
        {
            name: 'interchangeAtPeakModelList',
            model:'InterchangeAtPeakModel',
            associationKey:'interchangeAtPeakModelList'

        },
// and so on

My JSON looks like this:

Code:

{
    "cisoSystemLoadModelList": [
        {
            "sortOrder": 0,
            "title": "Peak Demand",
            "mw": "38,712",
            "time": "16:55",
            "asOfTime": "5/29/2014  2:25:58 PM",
            "groupName": ""
        },
        {
            "sortOrder": 1,
            "title": "Minimum Demand",
            "mw": "22,942",
            "time": "3:47",
            "asOfTime": "5/29/2014  2:25:58 PM",
            "groupName": ""
        },
        {
            "sortOrder": 2,
            "title": "Scheduled Load",
            "mw": "32,516",
            "time": "84%",
            "asOfTime": "5/29/2014  2:25:58 PM",
            "groupName": ""
        },
        {
            "sortOrder": 3,
            "title": "Pump Load",
            "mw": "290",
            "time": "",
            "asOfTime": "5/29/2014  2:25:58 PM",
            "groupName": ""
        }
    ]
}

In my controller I make a call to the proxy and I do get a successful callback

Code:

        var mainGridSheetStore = Ext.StoreMgr.lookup('MainGridSheetStore');
        
        var queryDate = 'TODAY';
        mainGridSheetStore.load({
            params: { 'queryDate': queryDate },
            callback: function(records, operation, success) {
                if (success) { 
                    var mainGridSheetStore = Ext.StoreMgr.lookup('MainGridSheetStore');
                    var mainGridModel = mainGridSheetStore.data.first();
                    var cisoStore = mainGridModel.data.cisoSystemLoadModelList;
// and so on

I can get the store, I can get the model from the first piece of data in the store. Now I want to get the store with the cisoSystemLoadModelList from that model. The mainGridModel comes back non-null but the data attribute seems to be empty. How can I get a reference to that data?

Thank you

Greg

How do I get data from a store which uses a model with HasMany lists?