[Play 2.4.0] Select Multiple with or without helpers (Java)

[Cwellan]

Hello everyone !

I am a newbie with play 2.X, and I'm using Play 2.4.0.
I have a Category model with Ebean, to handle Categories (a category can have several mothers, that's why the ManyToMany instruction):

@Entity
@Table(name="category")
public class Category extends Model {
    @Id
    public Long id;
   
    @Constraints.Required
    public String title;
   
    @Constraints.Required
    public String desc;
     
   
    public String url_image;
   
    @CreatedTimestamp
    @Constraints.Required
    public Timestamp dateAdd = new Timestamp(System.currentTimeMillis());
   
    public Timestamp dateValidated;
   
    @Version
    public Timestamp version;
   
    @Column(nullable=true)
    @ManyToMany(mappedBy="mothers")
    public Set<Category> daughters= new HashSet<Category>();
   
   
    @Column(nullable=true)
    @ManyToMany( cascade=CascadeType.ALL)
    @JoinTable(
            name="MOTHERS_CATEGORIES",
            joinColumns={@JoinColumn(name="DAUGHTER_ID", referencedColumnName="id")},
            inverseJoinColumns={@JoinColumn(name="MOTHER_ID", referencedColumnName="id")}
            )
   
    @OrderBy("dateAdd asc")
    public Set<Category> mothers = new HashSet<Category>();
   
}

I'd like to create a form where the user can select multiple categories in a select.
I've tried with and without helpers, but I still can't figure out how to code that...

What I've tried with the template:

<form action="@fastAddForms.routes.categoriesForms.addCategory()" method="get" class="" role="form">
    <div class="form-group ">
        <input type="text" name="title"/>
        <input type="text" name="desc"/>
        <select class="selectpicker" multiple="multiple" id="mothers" name="mothers[]">
            @for(c <- categories) {
               
                <option value="@c.id" >@c.title</option>
            }
        </select>
        <button>Add Category</button>
    </div>
</form>

And the controller:

    public  Result addCategory() {
       
         Form<Category> form = Form.form(Category.class).bindFromRequest();
         if (form.hasErrors()) {    
             return ok("ERRORS");
         }
         else {
             form.get().save();
             return ok(dmForm.data().toString());
         }
         
     }

Please, help me !

Thank you !

Regards,
Cwellan

[Cwellan]

I actually found a workaround by parsing.