Grails创建多对一的belongsTo [英] Grails form creation for many-to-one belongsTo

问题描述

我是 grails 的初学者，我有一个基本问题。我想在创建子类表单时显示父类的实例列表。

My Domain类如下。

  class Company {
字符串名称
静态约束条件= {
 
 
 $ name 
 
 $ b $ 
 
 $ b 
 My Child Class是公司的位置。
  class位置{
字符串名称
字符串地址
 static belongsTo = {companyLocation：Company} 
 
 static constraints = {
 name（blank：false）
 address blank：false 
 
 
 String toString（）{company：+ companyLocation +Location：+ name} 
} 
  
现在在位置视图的 _form模板中，我有 companyLocation下拉菜单的代码
 < div class =fieldcontain $ {hasErrors（bean：locationInstance，field：'companyLocation'，'error'）} required> 
< label for =companyLocation> 
 < span class =required-indicator> *< / span> 
 < / label> 
< / div> 
  
当我进入创建页面时，我收到错误消息：
 错误500：内部服务器错误
 URI / first_project / location / create 
类groovy.lang.MissingPropertyException 
消息否property：companyLocation for class：first_project.Location 
  
为什么当我有一个静态变量时出现这个错误位置域类中定义的 companyLocation 请问一些请让我知道我哪里出了问题？
 
 
 
感谢您提前致谢。
解决方案  
 
 
  static belongsTo = {companyLocation：Company} 
  
实际上应该是 $ b 
  static belongsTo = [companyLocation：Company] 
  
 
I am a beginner in grails and I have a basic question. I want to display a list of instances of a parent class in the child class form creation.


My Domain class are as follows. The Parent class is the Company.
class Company {
    String name
    static constraints = {
        name(blank:false)
    }
    String toString(){name}
}
My Child Class is the Location of the company.
class Location {
    String name
    String address
    static belongsTo= {companyLocation:Company}

    static constraints = {
    name(blank: false)
    address blank:false 
}

    String toString(){"company:"+companyLocation+"Location:"+name}
}
Now in the _form template' of location view I have the code for thecompanyLocation dropdown`
<div class="fieldcontain ${hasErrors(bean: locationInstance, field: 'companyLocation', 'error')} required">
<label for="companyLocation">
<g:message code="location.companyLocation.label" default="companyLocation" />
    <span class="required-indicator">*</span>
    <g:select id="companyLocation" name="companyLocation.id" from="${first_project.Company.list()}" optionKey="id" required="" value="${locationInstance?.companyLocation?.id}" class="many-to-one"/>
</label>
</div>
When I go to the the create page I get the error:
Error 500: Internal Server Error
URI /first_project/location/create
Class  groovy.lang.MissingPropertyException
Message No such property: companyLocation for class: first_project.Location
Why am I getting this error when I have a static variable companyLocation defined in the Location Domain class? Could some please let me know where I have gone wrong?

Thanks in advance.
解决方案
This looks like a syntax issue,
static belongsTo= {companyLocation:Company}
should really be 
static belongsTo= [companyLocation:Company]


                        
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