Grails选择不返回对象而是一个字符串 [英] Grails select not returning the object but a string

问题描述

我如何获得一个select标签来返回对象本身而不是一个字符串？
每当我去创建一个新的BusinessArea时，我会收到一个错误消息：

无法将java.lang.String类型的属性值转换为所需的类型bassscheduler.BusinessType属性businessType;嵌套异常是java.lang.IllegalStateException：无法将类型[java.lang.String]的值转换为属性所需的类型[bassscheduler.BusinessType] businessType：没有匹配的编辑器或转换策略找到

我做错了什么？我似乎无法找到关于如何让select标签返回对象本身而不是字符串的任何信息。

感谢您的帮助

我有以下模型

  class BusinessArea {
 
 BusinessType businessType 
 //此次创建的日期和时间
日期dateCreated 
 //上次维护此事件的日期和时间。 
 lastUpdated日期
 //上次维护此操作的OPERATOR或PROGRAM的标识符。 
 int lastMaintainer 
 //商业区域的名称
字符串名称
 $ b $静态约束= {
 lastMaintainer空白：false，可空：false 
名称空白：false，可为空：false 
} 
} 
  

和控制器操作

$ $ p $ code $ def createBusinessArea（）{

def businessArea = new BusinessArea（params）
if（！businessArea.save（flush：true））{
render view：index，model：[businessArea：businessArea，activeTemplate：businessArea]
return
}
redirect controller：admin，action：index，model：[activeTemplate：businessArea]
}

使用此表单提交给控制器操作

 < g：form controller =admin行动= createBusinessArea > 
< div class =row> 
<传说>商业区< /图例> 
< div class =span3> 
< label>商业领域：< / label> 
 < / div> 
< div class =span3> 
< label>商业类型：< / label> 
 < / div> 
< / div> 
 
< div class =buttons> 
< div class =row> 
< div class =span7style =padding-top：2em> 
 < / div> 
< / div> 
< / div> 
< / g：表格> 
  

解决方案

b $ b

 < g：select name =businessTypefrom =$ {businessTypes}optionValue =name/> 
  

应该是：

 < g：select name =businessType.idfrom =$ {businessTypes}optionValue =nameoptionKey =id/> 
  

How can I get a select tag to return the object itself and not a string? Whenever I go to create a new BusinessArea I get an error that says:

"Failed to convert property value of type java.lang.String to required type bassscheduler.BusinessType for property businessType; nested exception is java.lang.IllegalStateException: Cannot convert value of type [java.lang.String] to required type [bassscheduler.BusinessType] for property businessType: no matching editors or conversion strategy found"

Am I doing something wrong? I cant seem to find anything on how to get the select tag to return the object itself and not a string

Thanks for the help

I have the following model

class BusinessArea {

  BusinessType businessType
  // The date and time this occurence was created
  Date dateCreated
  // The date and time that this occurrence was last maintained.
  Date lastUpdated
  // The identifier for the OPERATOR or PROGRAM that last maintained this occurrence.
  int lastMaintainer
  // The name of the business area
  String name

  static constraints = {
    lastMaintainer blank: false, nullable: false
    name blank: false, nullable: false
  }
}

and controller action

def createBusinessArea() {

  def businessArea = new BusinessArea(params)
  if (!businessArea.save(flush: true)) {
    render view: "index", model : [businessArea: businessArea, activeTemplate: "businessArea"]
    return 
  }
  redirect controller: "admin", action: "index", model : [activeTemplate: "businessArea"]
}

With this form submitting to the controller action

<g:form controller="admin" action="createBusinessArea"> 
  <div class="row">
    <legend>Business Area</legend>
<div class="span3">
  <label>Business Area:</label>
  <g:textField name="businessArea"/>
</div>
<div class="span3">
  <label>Business Type:</label>
  <g:select name="businessType" from="${businessTypes}" optionValue="name"/>
</div>
  </div>

  <div class="buttons">
    <div class="row">
      <div class="span7" style="padding-top: 2em">
    <g:submitButton class="btn btn-primary pull-right" name="create" value="Create" />
  </div>
    </div>
  </div>
</g:form>

解决方案

This:

<g:select name="businessType" from="${businessTypes}" optionValue="name"/>

should be:

<g:select name="businessType.id" from="${businessTypes}" optionValue="name" optionKey="id" />

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