Extjs Key value json reader for store

KeyValue.js

/**
 * @class com.flexdevguy.data.reader.KeyValue
 * @extends Ext.data.reader.Json
 * Key value json reader for store 
 */
Ext.define('com.flexdevguy.data.reader.KeyValue', {
    extend: 'Ext.data.reader.Json',
    alias : 'reader.keyvalue',

    getRoot: function(data) {
        if (this.rootAccessor) {
            data = this.rootAccessor.call(this, data);
        }

        var values = [],
            key;

        for (key in data) {
            values.push({
                key: key,
                value: data[key]
            });
        }

        return values;
    }
});


var store = Ext.create('Ext.data.Store', {
    fields: ['key', 'value'],
    autoLoad: true,
    proxy: {
        type: 'ajax',
        url: 'xyz.json',
        reader: {
            type: 'keyvalue',
            rootProperty: 'jsonroot'
        }
    }
});