Drop down not populated when provide data thourgh promise

When i provide data by using promise, dropdown does not get populated. here is my code

ContactDBService.select().then(function (result) {
        $scope.colours = [
    { name: 'black', id: 0 },
    { name: 'white', id: 1 },
    { name: 'red', id: 2 }];

```
});
```

Please provide solution if im missing some thing
