java - Play Framework : Submit button doesn't seem to work

Question

我正在尝试自定义 Play framework -Computer database with Java例子。但是，我似乎无法使“编辑”页面上的提交按钮正常工作(已注释)。这是表格:

@(id: Long, computerForm: Form[Provider])

@import helper._

@implicitFieldConstructor = @{ FieldConstructor(twitterBootstrapInput.render) } 

@main {

    <h1>Provide fb*emphasized text*</h1>

    @form(routes.Application.update(id)) {

        <fieldset>

            @inputText(computerForm("fb"), '_label -> "Feedback", '_help -> "")
             @inputText(computerForm("rating"), '_label -> "Rating", '_help -> "")
        </fieldset>  
        <div class="actions">
            <!-- This button does nothing!-->
            <input type="submit" value="Submit fb!" class="btn primary"> or 
            <a href="@routes.Application.list()" class="btn">Cancel</a> 
        </div>

    }    
}

下面是 Application.java 中的 update 方法:

public static Result update(Long id) {
    Form<Provider> computerForm = form(Provider.class).bindFromRequest();
    if(computerForm.hasErrors()) {
        return badRequest(editForm.render(id, computerForm));
    }
    computerForm.get().update(id);
    flash("success", "Provider " + computerForm.get().fullname + " has been updated");
    return GO_HOME;
}

我做错了什么？

编辑 - 更多详细信息。

模型:Provider.java

/**
 * Company entity managed by Ebean
 */
@Entity
public class Provider extends Model {

private static final long serialVersionUID = 1L;

@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
public Long id;

@Constraints.Required
public String fullname;

public String tech;

public String experience;

public String email;

public String feedback;
public int rating;
/**
 * Generic query helper for entity Provider with id Long
 */
public static Model.Finder<Long, Provider> find = new Model.Finder<Long, Provider>(Long.class, Provider.class);

public static Map<String, String> options() {
    LinkedHashMap<String, String> options = new LinkedHashMap<String, String>();
    for (Provider c : Provider.find.orderBy("tech").findList()) {
        options.put(c.id.toString(), c.fullname);
    }
    return options;
}

public static Page<Provider> page(int page, int pageSize, String sortBy, String order, String filter) {
    return find.where().ilike(sortBy, "%" + filter + "%").findPagingList(pageSize).setFetchAhead(false)
            .getPage(page);
}

问题 2:当我点击按钮时会发生什么:什么都不可见。但是当我仔细观察时，它似乎重定向到同一页面(更新页面)。但基于 Controller ，我希望它返回到基于 GO_HOME 变量的主页。

应用程序.java

package controllers;

import play.mvc.*;
import play.data.*;
import static play.data.Form.*;

import views.html.*;

import models.*;

/**
 * Manage a database of Providers
 */
public class Application extends Controller {

    /**
     * This result directly redirect to application home.
     */
    public static Result GO_HOME = redirect(
        routes.Application.list(0, "fullname", "asc", "")
    );

    /**
     * Handle default path requests, redirect to computers list
     */
    public static Result index() {
        return GO_HOME;
    }

    /**
     * Display the paginated list of Providers.
     * 
     * @param page Current page number (starts from 0)
     * @param sortBy Column to be sorted
     * @param order Sort order (either asc or desc)
     * @param filter Filter applied on computer names
     */
    public static Result list(int page, String sortBy, String order, String filter) {
        return ok(
            list.render( 
                Provider.page(page, 10, sortBy, order, filter),
                sortBy, order, filter
            )
        );
    }

    /**
     * Display the 'edit form' of a existing Computer.
     *
     * @param id Id of the computer to edit
     * // TODO : Fix wiring and button actions 
     */
    public static Result edit(Long id) {
        Form<Provider> computerForm = form(Provider.class).fill(
            Provider.find.byId(id)
        );
        return ok(
            editForm.render(id, computerForm)
        );
    }

    /**
     * Handle the 'edit form' submission 
     *
     * @param id Id of the computer to edit
     */
    public static Result update(Long id) {
        Form<Provider> computerForm = form(Provider.class).bindFromRequest();
        if(computerForm.hasErrors()) {
            return badRequest(editForm.render(id, computerForm));
        }
        computerForm.get().update(id);
        flash("success", "Computer " + computerForm.get().fullname + " has been updated");
        return GO_HOME;
    }

    /**
     * Display the 'new Provider form'.
     */
    public static Result create() {
        Form<Provider> computerForm = form(Provider.class);
        return ok(
            createForm.render(computerForm)
        );
    }

    /**
     * Handle the 'new Provider form' submission 
     */
    public static Result save() {
        Form<Provider> computerForm = form(Provider.class).bindFromRequest();
        if(computerForm.hasErrors()) {
            return badRequest(createForm.render(computerForm));
        }
        computerForm.get().save();
        flash("success", "Provider " + computerForm.get().fullname + " has been created");
        return GO_HOME;
    }

}

Answer 1

请原谅，我最熟悉 Scala，但我怀疑您在提交时没有通过表单验证并返回相同的页面:

if(computerForm.hasErrors()) {
  return badRequest(createForm.render(computerForm));
}

在您的 Provider 类中看起来您是 defining a constraint 全名:

@Constraints.Required
public String fullname;

但是您没有在表单中包含 fullname。您能否从模型中删除约束或将字段添加到您的表单中？

同样与您的失败无关，您在 View 中引用了表单字段 fb，但 Provider 模型没有该值？应该是feedback吧？