Pageable and sort order problem

[dmarko484]

Hello,
I'm trying to use your provider with Vaadin 10(beta10) and I struggle with sort order not working properly. I have 'FilterablePageableDataProvider' attached to 'com.vaadin.flow.component.grid.Grid' . I have a few columns defined as sortable in the Grid. Now when I click on any sortable column, I cannot see a proper sorted column name in 'fetchFromBackEnd' method in Pageable object (using code below).

 protected Page<Porada> fetchFromBackEnd(Query<Porada, String> query, Pageable pageable) {          
    System.out.println(pageable.getSort().iterator().next().getProperty());
    ...
}

What I always get is column name defined in getDefaultSortOrders() ... in provider. Any ideas what is going one here?

BTW: Thanks for such a great addon!

[TatuLund]

See also: github.com/vaadin/framework/issues/12411

[SebastianDietrich]

We had the same issue until we found out the obvious: Pagination needs unique entries - i.e. if you sort a grid based on a row that is not unique, then pagination will possibly return the same elements twice or others not even once. --> make sure that you sort based on a row AND some unique row (e.g. ID)