[2.0] Binding multiselect in form to ManyToMany from request

[P-A Söderqvist]

Hi

If I have the following entities:

@Entity

public class Unit extends Model {

@Id

public Long id;

 ... 

public static Map<String, String> getAllAsMap() {

 ... // Returns map with id as key

}

}

@Entity

public class User extends Model {

@Id

public Long id;

@ManyToMany

public Set<Unit> units;

 ... 

}

and the following view:

@(userForm: Form[User], availableUnits: Map[String, String]) 

@main("Add User", "Users") {

@helper.form(action = routes.Users.create) { 

<fieldset>

...

@helper.select(userForm("units.id"), options(availableUnits), 'multiple -> "multiple", '_label -> "Unit", '_error -> userForm.error("units.id"))

</fieldset>

... 

}

}

and the following controller with methods to render and submit the form

public class Users extends Controller {

... 

public static Result addForm() {

return ok(addFormView.render(form(User.class), Unit.getAllAsMap()));

}

public static Result create() {

Form<User> userForm = form(User.class).bindFromRequest();

validateForm(userForm);

if (userForm.hasErrors()) {

return badRequest(addFormView.render(userForm, Unit.getAllAsMap()));

} else {

userForm.get().save();

return redirect(controllers.routes.Users.list());

}

}

...  

}

Is it possible to bind a multi select list automatically into a ManyToMany relationship from the request like this?

I have no problem binding to single string fields, single enum fields or ManyToOne fields.

br

P-A Söderqvist

[Drevlyanin]

Met with the same problem. I do not know how to solve it beautifully. :(

[András Pálinkás]

Any update on this one?

On Tue, Apr 3, 2012 at 3:31 PM, Drevlyanin <drevl...@gmail.com> wrote:

Met with the same problem. I do not know how to solve it beautifully. :(

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[Kevin Bosman]

There's no automatic way of handling this that I know of.
Please refer to my previous answer on this topic for some tips:
https://groups.google.com/d/msg/play-framework/oiUqGQ8IMCo/yF1vLNX1VxsJ