column sorting for ag-grid not working
<p>I have an ag-grid and I am dynamically loading data into it. I have enabled column sorting, however it does not work. Nothing happens when I click on the column header. I'm not sure what the issue is. Below is my code:</p>

<pre><code>    var colobj = {};
    for(i = 0; i&lt; file.fieldMetadata.length; i++){

   var len = file.fieldMetadata[i].name.length;

   colobj = {'headerName' : file.fieldMetadata[i].name, 'field' : file.fieldMetadata[i].name, sortingOrder: ['asc','desc', 'null']};

vm.columnDefs.push(colobj);

    vm.gridOptions.api.setColumnDefs(vm.columnDefs);
    vm.gridOptions.api.setRowData(vm.fileContentsCols);
    vm.gridOptions.enableSorting = true;
</code></pre>