How do I bind collection attributes to a form in Spring MVC

Question

I\'m trying to bind one of my model objects to the fields of a form, using Spring-MVC. Everything works fine, except that one of the attributes of the model object is an unorder

Answer 1

You can use a semi-colon-delimited list if you're using numeric references to the IDs of objects, and an appropriate Converter implementation registered.

POST data leaderboards=1,2

Converter implementation (ignore the JSON stuff)

    public final class LeaderboardConverter extends JsonDeserializer implements Converter
    {
        public Leaderboard convert(String source) throws IllegalArgumentException
        {
            Leaderboard activity = new Leaderboard();
            activity.setId(new Integer(source));
            return activity;
        }


        public Leaderboard deserialize(JsonParser jp, DeserializationContext ctxt) throws IOException, JsonProcessingException
        {
            return convert(jp.getText());
        }

}