Mapping ID to BusinessObject

[KrustyDerClown]

Hello Together

following situation / problem:

I have a form to create a game. A game (Business Object) consists of 2 teams (Team is also a BusinessObject), a matchday and a date. The JPS form looks like this:

<form:form modelAttribute="game">
    <table>
        <tr>
            <td><fmt:message key="game.management.form.game.name.team1" /></td>
            <td><form:select path="team1" items="${teamList}" itemLabel="name" itemValue="id"  /></td>
            <td><form:errors path="team1" /></td>
        </tr>
        <tr>
            <td><fmt:message key="game.management.form.game.name.team2" /></td>
            <td><form:select path="team2" items="${teamList}" itemLabel="name" itemValue="id"  /></td>
            <td><form:errors path="team2" /></td>
        </tr>
        <tr>
            <td><fmt:message key="game.management.form.game.startdate" /></td>
            <td><form:input path="start_date"/></td>
            <td><form:errors path="start_date" /></td>
        </tr>
        <tr>
            <td><fmt:message key="game.management.form.game.matchday" /></td>
            <td><form:input path="matchday"/></td>
            <td><form:errors path="matchday" /></td>
        </tr>

In the controller to setup the form i get the teamList with the following statements:

@RequestMapping(method = RequestMethod.GET)
    public String setupForm(ModelMap model) {
        Game game = new Game();
        List<Team> team = teamManager.getAllTeams();
        model.addAttribute(game);
        model.addAttribute(team);
        return "gameForm";
    }

The business object Game looks like this:

public class Game extends BaseEntity {
   
    @ManyToOne(fetch=FetchType.EAGER)
    private Competition competition;
   
    @ManyToOne(fetch=FetchType.EAGER)
    private Team team1;
   
    @ManyToOne(fetch=FetchType.EAGER)
    private Team team2;

    private int matchday;
   
    private Date start_date;

   // get- and set Method for all this attributes
...

...
public abstract class BaseEntity {
   
    @Id
    @GeneratedValue(strategy=GenerationType.IDENTITY)
    private Integer id;

So ... i get a problem when i want to save the new Game. There is no really error or exception. MVC Spring catch the error and show "Invalid data.".

Yes, its correct because i have set- and get-Methods to save a Team and not a ID (Integer value). But how can i solve my problem? How can i map between the id and the whole Team Business Object in my Game Business Object?

I hope i could explain where is my problem. :-) If not .. please ask what is unclear.

Thank you for your help and support in advance.

Best regards,
Oliver

[joshk]

Hi Krusty,

Your form backing object, jsp pages, and controllers look good, all you need to do now is tell Spring how to convert a team id into a team.

Have a look into property editors and data binding.

Hope this helps

Josh