如果实体的所有字段均为空，如何跳过Bean验证? [英] How can I skip bean validation if all fields for the entity are empty?

问题描述

我有一个这样的地址实体:

I have a address entity like this:

@Entity
public class Address implements java.io.Serializable {
    @Id @GeneratedValue(strategy = IDENTITY)
    private Long id;

    @Size(max = 100)
    private String street;

    @Size(max = 15)
    private String nr;

    @Field
    @Size(min = 1, max = 20) @NotBlank
    private String city;
}

这是其他几个实体的一部分.对于一个这样的实体，地址是可选的. 我有一个视图，我们的用户可以通过几个表单输入(包括几个地址字段)来编辑整个实体.

This is part of several other entities. For one such entity the address is optional. I have a view where our users can edit the whole entity via several form inputs, including several address fields.

为了能够编辑地址，我用一个空的地址实体初始化了父实体.

To be able to edit the address, I initialize the parent entity with an empty address entity.

现在的问题是:当所有地址字段为空时，我不想在实体上保留Address.为此，如果(且仅当)Address的所有字段为空时，我需要跳过对实体的验证.如何以最优雅的方式做到这一点?

Now the problem is: I don't want to persist an Address on the entity when all address fields are empty. For that to work, I need to skip validation for the entity if (and only if) all fields of Address are empty. How do I do that in the most elegant way?

我目前正在做的是完全跳过对提交按钮的<o:validateBean disabled="true" />与bean验证，如果地址为null，则将其设置为null.但这听起来像是完全破解，因为它在 all 情况下禁用了 all 验证.我该怎么做?

What I'm currently doing is to skip bean validation altogether with <o:validateBean disabled="true" /> for the submit button, setting the address to null if it comes out empty. But this sounds like a total hack as it disables all validation in all cases. How can I do better?

推荐答案

您可以在<f:validateBean>(和<o:validateBean>)的disabled属性中使用EL.您可以使用EL来检查是否已填写任何这些字段.您可以使用binding属性引用EL中的组件.您可以通过检查与组件的客户端ID关联的请求参数的值来检查是否已填写字段.

You can just use EL in disabled attribute of <f:validateBean> (and <o:validateBean>). You can use EL to check if any of those fields have been filled. You can use binding attribute to reference a component in EL. You can check if a field has been filled by checking the value of the request parameter associated with component's client ID.

然后，要在#{addressIsEmpty}评估true时在那些字段上禁用bean验证，使用<f:validateBean>而不是<o:validateBean>会更容易，因为前者可用于包装多个输入组件.

Then, to disable bean validation on those fields when #{addressIsEmpty} evaluates true, it's easier to use <f:validateBean> instead of <o:validateBean> as the former can be used to wrap multiple input components.

因此，这应该做到:

<c:set var="addressIsEmpty" value="#{empty param[street.clientId] and empty param[nr.clientId] and empty param[city.clientId]}" />

<f:validateBean disabled="#{addressIsEmpty}">
    <h:inputText binding="#{street}" value="#{bean.address.street}" />
    <h:inputText binding="#{nr}" value="#{bean.address.nr}" />
    <h:inputText binding="#{city}" value="#{bean.address.city}" />
</f:validateBean>

<o:validateBean>仅在您打算基于每个输入或每个命令进行控制时更易于使用.

The <o:validateBean> is only easier to use if you intend to control it on a per-input or per-command basis.

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