Ext.define('saas.override.grid.feature.Grouping', {
    override: 'Ext.grid.feature.Grouping',

    getMetaGroup: function(group) {
        var me = this,
            id = me.getId == null ? me.id : me.getId(),
            key, metaGroup, Model, modelData, groupPlaceholder, aggregateRecord, groupingContext;
        // Get the group from a member record or the group name
        if (group.isModel || typeof group === 'string') {
            group = me.getGroup(group);
        }
        if (group) {
            key = group.getGroupKey();
            groupingContext = group.$groupingContext || (group.$groupingContext = {});
            metaGroup = groupingContext[id];
            if (!metaGroup) {
                Model = me.getGridStore().getModel();
                // Add a placeholder record which represents the group if collapsed.
                modelData = {};
                modelData[me.getGroupField()] = key;
                // Create the two records a group needs to produce a UI.
                // One to represent a collapsed group.
                // And one to append to the end of an expanded group.
                groupPlaceholder = new Model(modelData);
                groupPlaceholder.isNonData = groupPlaceholder.isCollapsedPlaceholder = true;
                groupPlaceholder.groupKey = key;
                aggregateRecord = new Ext.data.Model(modelData);
                aggregateRecord.isNonData = aggregateRecord.isSummary = true;
                aggregateRecord.groupKey = key;
                metaGroup = groupingContext[id] = {
                    placeholder: groupPlaceholder,
                    isCollapsed: false,
                    lastGroup: null,
                    lastGroupGeneration: null,
                    lastFilterGeneration: null,
                    aggregateRecord: aggregateRecord
                };
            }
        }
        return metaGroup;
    }

});