Angularjs ui grid with grouping column sequence is getting jumbled up

Question

I am using AngularJs ui grid with grouping. The table is displaying fine but the problem I am facing is that the months sequence in the table is getting jumbled up. Please find my Plunker. In the table the Months are appearing in the jumbled up sequence 11-14, 05-15, 04-15, ... 02-15. But I need it in the sequence of 11-14, 12-14, 01-15, 02-15, 03-15, 04-15, 05-15. Can any one help me to fix it?

I am using the following for to get colDefs:

$scope.getColumnDefsForUiGrid = function(columns) {
     var colDef = [];
     colDef.push({
         name: 'mode',
         grouping: {
             groupPriority: 0
         },
         displayName: 'Type',
         enableCellEdit: false,
         width: '5%'
     });
     colDef.push({
         name: 'service',
         displayName: 'Catg',
         enableCellEdit: false,
         width: '5%'
     });
     angular.forEach(columns, function(value, key) {
         colDef.push({
             name: key,
             displayName: value,
             enableCellEdit: true,
             aggregationType: uiGridConstants.aggregationTypes.sum,
             width: '5%'
         })
     });
     return colDef;
 };

Answer 1

Here is a workaround for your problem you can see it working on this plunker

$scope.getColumnDefsForUiGrid = function( columns ){
        var colDef = [];                        
        colDef.push({name: 'mode', grouping: { groupPriority: 0 }, displayName: 'Type', enableCellEdit: false, width: '5%'});
        colDef.push({name: 'service',  displayName: 'Catg', enableCellEdit: false, width: '5%'});

        //I split the monthColumns into an other array                      
        var monthCol = [];
        angular.forEach(columns, function( value, key ) {
              monthCol.push({name: key, displayName: value, enableCellEdit: true, aggregationType : uiGridConstants.aggregationTypes.sum, width: '5%' })
        });

        //I sort this array using a custom function
        monthCol.sort(function(a,b){
              a = a.displayName.split("-");
              b = b.displayName.split("-");
              if(a[1] < b[1]){
                  return -1;
              }else if (a[1] > b[1]){
                  return 1;
              }else {
                  if(a[0] < b[0]){
                     return -1;
                  }else{
                    return 1;
                  }
              }
        });

   //I concat the two array
   return colDef.concat(monthCol);
};