Grails域:如何访问父域数据? [英] Grails Domain: How to access parent domain data?
问题描述
我有一个父子域结构,并且我想在验证器的子域中访问父域数据。例如,在下面的代码示例中,child1有一个变量'name',为了验证器的目的,我需要child2数据。
我该如何实现这种情况?
我有这样的域名结构:
class Parent {
Child child1
Child child2
静态映射= {
child1 lazy:false
child2 lazy:false
}
}
class Child {
字符串名称
//一些其他变量
static belongsTo = [parent:Parent]
static constraints = {
name(nullable:true,validator:{val,obj - >
if(obj.parent){
return true
}
return false
})
}
}
我尝试了
this.parent.child2
,但父项被发现为空。
编辑: 另外在验证器中添加: 仍然返回false。 with 所以孩子知道它的父母 I have a parent child domain structure, and I want access parent domain data in child domain for validator. For example in the code example below, child1 has a variable 'name' and for validator purpose I need child2 data. How can I achieve this situation? I have domain structure like this: I tried
EDIT: Also added in validator: Still it is returning false. Replace with so the child know its parent 这篇关于Grails域:如何访问父域数据?的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!
已更改:
static belongsTo = [parent:Parent] $ c
$ b
if(obj.parent){
return true
}
返回false
static belongsTo = [Parent]
code>
static belongsTo = [parent:Parent]
class Parent{
Child child1
Child child2
static mapping = {
child1 lazy:false
child2 lazy:false
}
}
class Child{
String name
// some other variables
static belongsTo = [parent:Parent]
static constraints = {
name(nullable:true,validator:{val, obj ->
if(obj.parent){
return true
}
return false
})
}
}
this.parent.child2
but parent is found null.
Changed:
static belongsTo = [parent:Parent]
if(obj.parent){
return true
}
return false
static belongsTo = [Parent]
static belongsTo = [parent: Parent]