Question

this is my Topic’s data members:

public class Topic extends Model {  
@Id  
protected long id;  
public String title;  
public String content;  
@ManyToOne  
@JoinColumn(name = "forumId")  
public Forum forum;  // this is a reference to the topic's forum. 

forum attribute saved in postgresql as bigint (the id of the Forum class)

this is my Finder for Topic:

public static Finder<Long,Topic> find = new Finder<Long,Topic>(Long.class, Topic.class);

now, I’m trying the simplest thing using Finder. retrieve Topics by forum id.
I tried many variations, this is one of them:

public static List<Topic> getTopicsByForum(long id) {
    Forum forum = Forum.getById(id);
    return find.where().gt("forumId", forum).findList();
}

I get wrong results. I must do something wrong but don’t know what.

Answer 1

With Ebean, you can access properties directly, so try this:

public static List<Topic> getTopicsByForum(Long forumId) {
    return find.where().eq("forum.id", forumId).findList();
}