java - Play 2.x : Binding model which contains a list to the template

Question

我有两个模型“用户”和“地址”。

public class User extends Model{
   public String name;
   public List<Address> addresses;
}

public class Address extends Model{
   public String street;
   public String house;
}

我有一个用于添加用户的模板。

@(form: Form[User])

@helper.form(action=routes.User.add())
{
   <label>Add User<label>
   @text(form("name"), label="Name")
   <input type="submit" class="btn btn-primary" value="Save" />
}

在我的 Controller 中，我有 add 方法。

public static Results add()
{
   Form<User> filledForm = userForm.bindFromRequest();
   User user = filledForm.get();
}

我跳过了不必要的信息，例如错误处理。现在我该如何绑定(bind)地址？我希望能够在表单中添加多个地址。

在 Play 1.1 中，我见过 POJO 集合之类的东西，但我正在使用 2.3。

Answer 1

正如评论中提到的，JavaScript 和 AJAX 可能是最舒适的解决方案，即您可以将一个用户创建为非 Activity 状态，并仅在稍后添加至少一个地址时才激活他。

其他解决方案可以使用具有来自(用户和地址)的字段的自定义类，因此在验证所有必填字段后，您可以创建用户和关联的地址。

示例

用户模型:

public class User extends Model {

    public String firstName;
    public String lastName;
    
    @OneToMany(mappedBy = "user")
    public List<Address> addresses; // This field doesn't keep relations it informs that relation is kept in `user` field of `Address` model

}

地址型号:

public class Address extends Model {
    
    @ManyToOne
    public User user;
    
    public String street;
    public String house;

}

UserAdmin Controller :

public static class UserWithAddress { //This is our class for validating data for user and his `primary` address

    // User's fields
    @Required
    public String firstName;

    @Required
    public String lastName;

    // Address' fields
    @Required
    public String street;

    @Required
    public String house;

}

public static Result addUserWithAddress() {
    Form<UserWithAddress> userForm = Form.form(UserWithAddress.class);
    return ok(userWithAddressView.render(userForm));
}

public static Result saveUserWithAddress() {
    Form<UserWithAddress> userForm = Form.form(UserWithAddress.class).bindFromRequest();

    if (userForm.hasErrors()) {
        return badRequest(userWithAddressView.render(userForm));
    }

    // form is valid, let's extract data from form, create and save both objects
    UserWithAddress data = userForm.get();

    User user = new User();
    user.firstName = data.firstName;
    user.lastName = data.lastName;
    user.save(); // Save new user before creating new Address, cause we need a new ID to associate...

    Address address = new Address();
    address.user = user;
    address.street = data.street;
    address.house = data.house;
    address.save();

    return ok("Hooray you're registered now! And we know where you live ;)");
}

userWithAddressView.scala.html View

@(userForm: Form[controllers.UsersAdmin.UserWithAddress])

@main(title = "Input your basic data and address data") {

    @helper.form(action=routes.UsersAdmin.saveUserWithAddress()){

        @helper.inputText(userForm("firstName"))
        @helper.inputText(userForm("lastName"))
        @helper.inputText(userForm("street"))
        @helper.inputText(userForm("house"))
        <input type="submit" value="Save"/>

    }

}