Save Many-to-Many in Spring MVC

Question

I got relation many to many between Restaurant and Tag. Here are my entities:

public class Restaurant {
    @Id
    @GeneratedValue
    private int id;
    (         


        

Answer 1

You will have to define a custom property editor for the tags property of your restaurant object on your controller.

@InitBinder
    protected void initBinder(HttpServletRequest request,
            ServletRequestDataBinder binder) throws Exception {

        super.initBinder(request, binder);

        binder.registerCustomEditor(List.class, "tags",new CustomCollectionEditor(List.class){

            @Override
            protected Object convertElement(Object element) {
                Tag tag = new Tag();

                if (element != null) {
                    Long id = Long.valueOf(element.toString());
                    tag.setId(id);
                }
                return tag;
            }
        });

    }