Java 玩吧！框架 - 无法使用现有值填充表单

Question

我正在使用 Java Play framework 2.3.6。我无法使用现有值填充表单。

代码片段如下。

Application.java

 public class Application extends Controller{
    static Form<Roles> rolesForm=Form.form(Roles.class);

    public static Result getRoleById(Long id){
    Roles r = RolesDao.getRoleById(id);

    //rolesForm.fill(RolesDao.getRoleById(id));
    rolesForm.fill(r);
    return ok(updateRole.render(rolesForm));
}}

updateRole.scala

  @(roleForm : Form[models.Roles])
  @import helper._

@main("Update Role Details"){
   @form(routes.Application.updateRole(Long Id)){   
      @inputText(roleForm("role_short_description"))
      @inputText(roleForm("role_long_description"))
      @inputRadioGroup(roleForm("active_yn"))
    <br>
      <input type="submit" value="Update">
  }
 }

Roles.java

 public class Roles extends Model{
    @Id
    @SequenceGenerator(schema=Roles.SCHEMA,name="gen",     sequenceName="role_id_seq",allocationSize=1)
    @GeneratedValue(strategy=GenerationType.SEQUENCE,generator="gen")
    public Long role_id;

    @Required
    public String role_short_description=null;

    @Required
    public String role_long_description=null;

    public String active_yn=null;

RolesDAO.java

public class RolesDao {

     public static Finder<Long,Roles> find = new Finder<Long, Roles>(
        Long.class, Roles.class
      );
     public static Roles getRoleById(Long id) {
        return find.where().eq("role_id", id).findUnique();
    }}

Answer 1

试试这个，

public class Application extends Controller{

    public static Result getRoleById(Long id){

        Roles role = RolesDao.getRoleById(id);
        Form<Roles> rolesForm = Form.form(Roles.class).fill(role);

        return ok(updateRole.render(rolesForm));
    }
}

始终将表单保存在 Action 方法中，而不是全局保存。

Java 玩吧！框架 - 无法使用现有值填充表单

Java Play! Framework - Unable to populate form with existing value

playframework-2.3