hasmany relation two models one store trouble bubble

[dishwashwebdesign]

Model Item

Ext.define('stockwiz.model.Item', {
    extend: 'Ext.data.Model',
    config: {
        fields: [
            { name: '_id',  type: 'string' },
            { name: 'name',  type: 'string' },
        ],
        hasMany: {model: 'Linkeditems', name: 'linkeditems'},
    }
});

Model Linkeditems

Ext.define('stockwiz.model.Linkeditems', {
    extend: 'Ext.data.Model',
    config: {
        fields: [
            { name: '_id',  type: 'string' },
            { name: '_item_id',  type: 'string' },
            { name: 'quantity',  type: 'float' },
            { name: 'notes',  type: 'string' },
        ],
        belongsTo: 'Item'
    }
});

JSON into Item Store

{
    "_id": "4fc608e66a41a65814000001",
    "name": "product link test",
    "linkeditems": [
        {
            "_item_id": "4fc5c91804e17e0100000001",
            "quantity": 10,
            "notes": ""
        },
        {
            "_item_id": "4fc5afeed501360100000002",
            "quantity": 1,
            "notes": ""
        }
    ]
}

Funny error when doing:

var myStore = Ext.StoreMgr.get('Item');
var storeItem = myStore.first();
console.log('linkeditems count: '+storeItem.linkeditems.getCount());

TypeError: 'undefined' is not an object (evaluating 'storeItem.linkeditems.getCount')

Whats wrong with that has-many setup?
Kinda tried to take over logic from http://docs.sencha.com/touch/2-0/#!/....reader.Reader

Thanks for any hints...

[mitchellsimoens]

Try setting the associationKey config in the hasMany config to "linkeditems"

[dishwashwebdesign]

thanks for the response, but this didn't help either.
will just go back to the old-fashioned-kinda way of having a separate store and do the linking with filters instead
cheers...