ExtJS 4 RowEditing根据记录禁用一列的编辑

columns: [
    {
        header: 'Name',
        dataIndex: 'name',
        editor: {
            xtype: 'textfield'
        }
    },
    {
        header: 'Age',
        dataIndex: 'age',
        editor: null
    }
]

plugins: [
    {
        ptype: 'rowediting',
        clicksToEdit: 2
    }
],
listeners: {
    beforeedit: function(editor, e) {
        if (e.field === 'age') {
            return false;
        }
    }
}