Question

我有这个控制器，它执行一个多域数据绑定类，它正在我想要的工作。但我想对错误消息提供一些帮助。是否可以显示来自多个域类的错误消息？如果是这样，那么代码应该是视图还是控制器？

class CarroMovel {
    String move
    String rodas
    String espelhos
    Carro carro

    static hasMany = [carros: Carro]
    static belongsTo = Carro

    static constraints = {
        move(nullable:false, blank:false)
    }

    static mapping = {
        version false
    }
}

类Carro {

String name
String marca
String matricula

static constraints = {
    name(nullable:false, blank:false)
}

static mapping = {
    version false
}

}

def save3 = {

        def carroInstance = new Carro( )
        def carroMovelInstance = new CarroMovel( )

        carroInstance.name = params.carro.name
        carroInstance.marca = params.carro.marca
        carroInstance.matricula = params.carro.matricula

        carroMovelInstance.move = params.carroMovel.move
        carroMovelInstance.rodas = params.carroMovel.rodas
        carroMovelInstance.espelhos = params.carroMovel.espelhos

        carroInstance.save(failOnError: true)

        carroMovelInstance.carro = carroInstance
        carroMovelInstance.save(failOnError: true)

    }

<g:form controller="carro" action="save3">
<h1>Add New Carro Record</h1>
<p>Basic Information</p>

<label>Name
<span class="small">Add your name</span>
</label>
<input type="text" name="carro.name" value="${carroInstance?.name}" /><br>

<label>Marca
<span class="small">Add your name</span>
</label>
<input type="text" name="carro.marca" value="${carroInstance?.marca}" /><br

  <label>Matricula
<span class="small">Add your name</span>
</label>
<input type="text" name="carro.matricula" value="${carroInstance?.matricula}" /><br>

<label>Move
<span class="small">Add your name</span>
</label>
<input type="text" name="carroMovel.move" value="${carroMovelInstance?.move}" /><br>

<label>Rodas
<span class="small">Add your name</span>
</label>
<input type="text" name="carroMovel.rodas" value="${carroMovelInstance?.rodas}" /><br>

<label>Espelho
<span class="small">Add your name</span>
</label>
<input type="text" name="carroMovel.espelhos" value="${carroMovelInstance?.espelho}" /><br>

<g:submitButton name="save" value="Save" id="addConference"/>


<div class="spacer"></div>
  </g:form>

                <g:hasErrors bean="${carroInstance}">
            <div class="errors">
                <g:renderErrors bean="${carroInstance}" as="list" />
            </div>
            </g:hasErrors>

Answer 1

Grails验证错误入门

域对象的错误存储在errors属性中，该属性在验证后添加到对象中。此属性是Spring Errors接口的实现。

您可以通过直接调用此接口的方法来获取错误，例如显示move实例的Carro字段的错误：

List<FieldError> moveErrors = carroMovelInstance.errors?.getFieldErrors('move')

要获取每个错误的错误消息，您需要参考Grails创建的messageSource bean。您可以通过以下方式获取上述每个错误的消息：

List<String> errorMessages = moveErrors.collect {error -> 
    messageSource.getMessage(error, Locale.default) 
}

或者，Grails提供eachError和renderErrors标记，以简化在GSP中显示错误及其相应的消息。

您的代码的具体问题

在您的控制器代码中，只要save因验证错误而失败，就会抛出异常，因此视图无法显示错误。要解决此问题，请更改控制器，以便在保存失败时返回域对象（及其错误）

def save3 = {

    def carroInstance = new Carro( )
    def carroMovelInstance = new CarroMovel( )

    carroInstance.name = params.carro.name
    carroInstance.marca = params.carro.marca
    carroInstance.matricula = params.carro.matricula

    carroMovelInstance.move = params.carroMovel.move
    carroMovelInstance.rodas = params.carroMovel.rodas
    carroMovelInstance.espelhos = params.carroMovel.espelhos

    // I'm assuming in the code below that the view that displays the form is 'create.gsp'
    if (!carroInstance.save()) {
        render view: 'create', model : [carro: carroInstance, carroMovel: carroMovelInstance]
        return
    }

    carroMovelInstance.carro = carroInstance

    if (!carroMovelInstance.save()) {
        render view: 'create', model : [carro: carroInstance, carroMovel: carroMovelInstance]
    }

}

还需要更改GSP以使用Errors API直接显示这些错误或使用其中一个Grails标记（参见上文）

grails控制器渲染错误多个域类

1 个答案:

Grails验证错误入门

您的代码的具体问题