0

我在向父母添加子域时遇到了一些困难。这是课程：

  class parent{
String firstName
String lastName
String dobYear
String dobMonth
String dobDay
Date dateCreated
Date lastUpdated
long version

static hasMany = [
    chidlren: Children

]

static mapping = {
    cache true
    id generator: 'assigned'

    columns {
        firstName           type:'text'
        lastName            type:'text'
        dobYear             type:'text'
        dobMonth            type:'text'
        dobDay              type:'text'
    }


}
static constraints = {
    firstName           (nullable:true)
    lastName            (nullable:true)     
    dobYear             (nullable:true)
    dobMonth            (nullable:true)
    dobDay              (nullable:true)     
    id              (nullable:false)

}

}

孩子们：

   class Children{

String skillId
String skillName    
String skillProficiency
String skillYears       
Date dateCreated
Date lastUpdated
long version

static belongsTo = [parent:Parent]
static mapping = {
    cache true
    columns {       
        skillId      type:'text'
        skillName    type:'text'
        skillProficiency type:'text'            
        skillYears   type:'text'
    }
}
static constraints = {

     skillId                    (nullable:true)
     skillName                  (nullable:true)
     skillProficiency           (nullable:true) 
     skillYears                 (nullable:true) 
}

}

然后我像这样实例化父类： //my xml def feed= new XmlSlurper().parseText(linkedinResponse);

     def newParent= new Parent(
        firstName:"${feed.'first-name'}",
        lastName:"${feed.'last-name'}",
        dobYear :"${feed.'date-of-birth'.'year'}",
        dobMonth:"${feed.'date-of-birth'.'month'}",
        dobDay  :"${feed.'date-of-birth'.'day'}"        

       )
      .id="${feed.id}".toString()

在我的 xml 提要中，我有多个子节点，所以我想创建多个域节点并将它们添加到父节点。xml 的东西工作正常：

  feed.skills.skill.each{ mySkill ->
def newChild = new Children(
              skillId:  mySkill.'id',
              skillName:    mySkill.'name',
              skillProficiency: mySkill.'proficiency',
              skillYears    :   mySkill.'years'
              )
          newParent.addToChildren(newChild )
      }

当我尝试添加孩子时，出现错误（方法签名：com.myapp.Children.call() 适用于参数类型：() 值：[]）

除了额外的字段，这与我在 grails 网站上找到的示例有何不同，如下所示：

 def parent = new Parent(name:'Dad')
 parent.addToChildren(new Child(name:'son'))
 parent.addToChildren([name:'daughter'])

谢谢你的帮助

杰森

4

1 回答 1

0

也许是一个错字。在您的示例中，您可以阅读：

static hasMany = [
    chidlren: Children
]

应该：

static hasMany = [
    children: Children
]
于 2012-09-21T03:07:34.223 回答