缺少Play Framework嵌套表格错误 [英] Play Framework nested form errors missing

问题描述

我正在将Play Framework 2.3与Java一起使用，并且在委员会及其记录的会议日期之间存在以下一对多关系:

I am using Play Framework 2.3 with Java and I have the following one-to-many relationship between a committee and its recorded meeting dates:

@Entity
public class Committee {
    @Id
    protected Long id;

    @OneToMany(cascade=CascadeType.ALL, mappedBy="committee", orphanRemoval=true)
    private List<MeetingDate> meetingDates;
}

@Entity
public class MeetingDate {
    @Id
    private Long id;

    @Constraints.Required
    @JoinColumn(nullable=false)
    @ManyToOne
    private Committee committee;

    @Constraints.Required
    @Formats.DateTime(pattern="dd MMM yyyy")
    @Temporal(TemporalType.DATE)
    @Column(nullable=false)
    private Date meetingDate;
}

我有一个表格，允许用户在一个页面上编辑委员会和相关的会议日期.我遵循了 https://www.playframework.com/中的表单"示例应用程序documentation/2.2.x/Samples ，而我的模板代码如下:

I have a form that allows the user to edit a committee and the associated meeting dates on the one page. I've followed the "Forms" sample application from https://www.playframework.com/documentation/2.2.x/Samples and my template code looks like this:

@meetingDateGroup(field: Field, className: String = "meeting-date") = {
    <tr class="repeating-group @className">
      <td>
        <input type="hidden" id='@field("id").name' name='@field("id").name' value='@field("id").value'>
        <input type="text" id='@field("meetingDate").name' name='@field("meetingDate").name' value='@field("meetingDate").value' class="form-control">
        @if(field("meetingDate").hasErrors){
            <div class="help-block"><span class="glyphicon glyphicon-exclamation-sign"></span> @field("meetingDate").errors.mkString(", ")</div>
        }
      </td>
      <td align="right"><a href="javascript:void(0)" class="remove-meeting-date rowIcon"><span class="glyphicon glyphicon-remove"></span> Delete</a></td>
    </tr>
}

...

@helper.repeat(form("meetingDates"), min=1) { meetingDate =>
    @meetingDateGroup(meetingDate)
}

@**
 * Keep a hidden block that will be used as template for Javascript copy code
 **@
@meetingDateGroup(
    form("meetingDates[x]"), className = "hidden meeting-date-template"
)

请注意，还有额外的Javascript代码(未显示)可动态添加和删除表中的会议日期行.该Javascript代码是从Forms示例应用程序中复制的.

Note that there is extra Javascript code (not shown) to add and remove the meeting date rows from the table dynamically. This Javascript code was copied from the Forms sample application.

我的问题是未在MeetingDate实体上执行验证.例如，我添加了一个额外的会议日期行，而不输入该日期的值.保存委员会后，Form没有任何错误，但发生以下异常:

The problem I have is that validation is not performed on the MeetingDate entities. For example, I add an extra meeting date row and don't enter a value for the date. When I save the committee, I don't get any errors in the Form, but the exception below occurs:

play.api.Application$$anon$1: Execution exception[[RollbackException: Error while committing the transaction]]
        at play.api.Application$class.handleError(Application.scala:296) ~[play_2.11-2.3.4.jar:2.3.4]
        at play.api.DefaultApplication.handleError(Application.scala:402) [play_2.11-2.3.4.jar:2.3.4]
        at play.core.server.netty.PlayDefaultUpstreamHandler$$anonfun$3$$anonfun
$applyOrElse$4.apply(PlayDefaultUpstreamHandler.scala:320) [play_2.11-2.3.4.jar:2.3.4]
        at play.core.server.netty.PlayDefaultUpstreamHandler$$anonfun$3$$anonfun
$applyOrElse$4.apply(PlayDefaultUpstreamHandler.scala:320) [play_2.11-2.3.4.jar:2.3.4]
        at scala.Option.map(Option.scala:145) [scala-library-2.11.1.jar:na]
Caused by: javax.persistence.RollbackException: Error while committing the transaction
        at org.hibernate.jpa.internal.TransactionImpl.commit(TransactionImpl.java:94) ~[hibernate-entitymanager-4.3.5.Final.jar:4.3.5.Final]
        at play.db.jpa.JPA$2.apply(JPA.java:193) ~[play-java-jpa_2.11-2.3.4.jar:2.3.4]
        at play.core.j.FPromiseHelper$$anonfun$map$1.apply(FPromiseHelper.scala:98) ~[play_2.11-2.3.4.jar:2.3.4]
        at scala.util.Success$$anonfun$map$1.apply(Try.scala:236) ~[scala-library-2.11.1.jar:na]
        at scala.util.Try$.apply(Try.scala:191) ~[scala-library-2.11.1.jar:na]
Caused by: javax.validation.ConstraintViolationException: Validation failed forclasses [models.MeetingDate] during persist time for groups [javax.validation.groups.Default, ]
List of constraint violations:[
        ConstraintViolationImpl{interpolatedMessage='error.required', propertyPath=meetingDate, rootBeanClass=class models.MeetingDate, messageTemplate='error.required'}
]
        at org.hibernate.cfg.beanvalidation.BeanValidationEventListener.validate(BeanValidationEventListener.java:160) ~[hibernate-core-4.3.6.Final.jar:4.3.6.Final]
        at org.hibernate.cfg.beanvalidation.BeanValidationEventListener.onPreInsert(BeanValidationEventListener.java:95) ~[hibernate-core-4.3.6.Final.jar:4.3.6.Final]
        at org.hibernate.action.internal.EntityInsertAction.preInsert(EntityInsertAction.java:218) ~[hibernate-core-4.3.6.Final.jar:4.3.6.Final]
        at org.hibernate.action.internal.EntityInsertAction.execute(EntityInsertAction.java:97) ~[hibernate-core-4.3.6.Final.jar:4.3.6.Final]
        at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:463) ~[hibernate-core-4.3.6.Final.jar:4.3.6.Final]
[ERROR] [09/03/2014 23:25:59.167] [play-akka.actor.default-dispatcher-4] [akka.dispatch.Dispatcher] EntityManager is closed
java.lang.IllegalStateException: EntityManager is closed
        at org.hibernate.jpa.internal.EntityManagerImpl.checkOpen(EntityManagerImpl.java:105)
        at org.hibernate.jpa.internal.EntityManagerImpl.checkOpen(EntityManagerImpl.java:96)
        at org.hibernate.jpa.internal.EntityManagerImpl.close(EntityManagerImpl.java:148)
        at play.db.jpa.JPA$3.invoke(JPA.java:209)
        at play.db.jpa.JPA$3.invoke(JPA.java:203)
        at play.core.j.FPromiseHelper$$anonfun$onFailure$1.applyOrElse(FPromiseHelper.scala:116)
        at play.core.j.FPromiseHelper$$anonfun$onFailure$1.applyOrElse(FPromiseHelper.scala:116)
        at scala.concurrent.Future$$anonfun$onFailure$1.apply(Future.scala:136)
        at scala.concurrent.Future$$anonfun$onFailure$1.apply(Future.scala:134)
        at scala.concurrent.impl.CallbackRunnable.run(Promise.scala:32)
        at play.core.j.HttpExecutionContext$$anon$2.run(HttpExecutionContext.scala:40)
        at akka.dispatch.TaskInvocation.run(AbstractDispatcher.scala:41)
        at akka.dispatch.ForkJoinExecutorConfigurator$AkkaForkJoinTask.exec(AbstractDispatcher.scala:393)
        at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)
        at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)
        at scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)
        at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)

[error] a.d.Dispatcher - EntityManager is closed
java.lang.IllegalStateException: EntityManager is closed
        at org.hibernate.jpa.internal.EntityManagerImpl.checkOpen(EntityManagerImpl.java:105) ~[hibernate-entitymanager-4.3.5.Final.jar:4.3.5.Final]
        at org.hibernate.jpa.internal.EntityManagerImpl.checkOpen(EntityManagerImpl.java:96) ~[hibernate-entitymanager-4.3.5.Final.jar:4.3.5.Final]
        at org.hibernate.jpa.internal.EntityManagerImpl.close(EntityManagerImpl.java:148) ~[hibernate-entitymanager-4.3.5.Final.jar:4.3.5.Final]
        at play.db.jpa.JPA$3.invoke(JPA.java:209) ~[play-java-jpa_2.11-2.3.4.jar:2.3.4]
        at play.db.jpa.JPA$3.invoke(JPA.java:203) ~[play-java-jpa_2.11-2.3.4.jar:2.3.4]

MeetingDate对象绝对无效，因为它的meetingDate属性为null.我的问题是:为什么没有以错误形式报告此错误，即为什么以下表达式为假?

The MeetingDate object is definitely invalid because it's meetingDate property is null. My question is: why is this error not reported in the form errors, i.e. why is the following expression false?

Form.form(Committee.class).bindFromRequest().hasErrors()

推荐答案

只是弄清楚了我所缺少的-我需要在我的一对多关系中添加@Valid批注:

Just figured out what I was missing - I needed to add the @Valid annotation to my one-to-many relationship:

@Valid
@OneToMany(cascade=CascadeType.ALL, mappedBy="committee", orphanRemoval=true)
private List<MeetingDate> meetingDates;

这将触发对嵌套字段的验证.

This triggers the validation on the nested field.

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