FeatureStore with fields config do not work

[chrismayer]

If you create an instance of GeoExt.data.store.Features with an explicit fields configuration the creation fails in case of connecting a grid with a FeatureRenderer in one of its columns (Mostly like we do in the official FeatureGrid example.

Here is the failing code:

var featStore = Ext.create('GeoExt.data.store.Features',  {
  fields: ['city'],
  layer: vectorLayer,
  map: olMap
});
var grid = Ext.create('Ext.grid.Panel', {
  border: true,
  region: 'east',
  store: featStore,
  columns: [
    {
        xtype: 'widgetcolumn',
        width: 40,
        widget: {
            xtype: 'gx_renderer'
        },
        onWidgetAttach: function(column, gxRenderer, record) {
         // update the symbolizer with the related feature
          var feature = record.olObject;
         gxRenderer.update({
            feature: feature,
            symbolizers: featRenderer.determineStyle(record)
         });
       }
     },
     {text: 'Name', dataIndex: 'city', flex: 2}
 ],
 width: 250
});

In case you remove the fields declaration it works.

A first short look into this topic showed me that the main reason of failing is the fact that the records in the store do not have an olObject. So no feature could be retrieved from the record.