ExtJs 6 doSort method
<p>I didn't find doSort function available in EXT 6 with respect to the grid columns and also didnt find it in any upgrade notes. may be because it is a private function, can anyone please tell me what is the alternative to do the same thing what doSort was doing in Ext 4 ?</p>

<p>I tried to use sorters instead, </p>

<pre><code>{
    text: 'columnText',
    dataIndex: 'columnIndex',
    sorter: me.sort
}

sort: function(v1,v2) {
    ...
}
</code></pre>

<p>but i didn't found smth like dataIndex or columnName in v1, v2 parameters to do sort. (it's just a model)</p>

<p>I need empty cell be from below after Sort Ascending, empty cell be from above after Sort Descending</p>

<p>Thanks.</p>