extJs - populate grid panel with array of strings

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I receive an array of strings from the server. How can I populate my grid panel if the data is not in key-value format?

Here is the response: {"result":true,"data":["dep1","dep2","dep3"],"totalCount":3}

Here is my grid panel

xtype: 'gridpanel',
flex: 1,
itemId: 'departmentsGridPanel',
title: '',
store: new Ext.data.ArrayStore({
    autoLoad: true,
    fields: [
        'department'
    ],
    proxy: {
        type: 'ajax',
        url: 'FilteringDataServlet?filterColumn=avdeling',
        reader: {
            type: 'json',
            root: 'data'
        }
    }
}),
columns: [{
    text: 'Avdeling',
    flex: 1,
    dataIndex: 'department'
}],

asked 26 secs ago

Oleg

964