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danielberndt/Application.java

Created February 21, 2012 14:28
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How to solve self-referential issues with ebeans/playframework
Raw
Application.java
package controllers;
import models.QueueElement;
import play.*;
import play.mvc.*;
import views.html.*;
public class Application extends Controller {
public static Result create() {
QueueElement lastQe = null;
for (int i=0; i<10; i++) {
QueueElement qe = new QueueElement("queue element "+i);
qe.save();
if (lastQe!=null) {
lastQe.successor = qe;
lastQe.save();
}
lastQe = qe;
}
lastQe.save();
return ok("created");
}
public static Result index() {
return ok(index.render(QueueElement.find.all()));
}
}
Raw
index.scala.html
@(list: List[models.QueueElement])
<html>
<ul>
@for(qe <- list) {
<li>@qe.id - @qe.content</li>
}
</ul>
</html>
Raw
outcome.html
<html>
<ul>
<li>1 - queue element 0</li>
<li>2 - </li>
<li>3 - queue element 2</li>
<li>4 - </li>
<li>5 - queue element 4</li>
<li>6 - </li>
<li>7 - queue element 6</li>
<li>8 - </li>
<li>9 - queue element 8</li>
<li>10 - </li>
</ul>
</html>
Raw
QueueElement.java
package models;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.ManyToOne;
import play.db.ebean.Model;
@Entity
public class QueueElement extends Model {
@Id
public Long id;
@ManyToOne
public QueueElement successor;
public String content;
public static Finder<Long,QueueElement> find = new Finder<Long,QueueElement>(Long.class, QueueElement.class);
public QueueElement(String content) {
this.content = content;
}
}
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