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字段之间关系的Grails域类约束

[英]Grails domain class constraints for relation between fields

I need to write Domain class constraint in Grails which says that one integer field must be greater or equal than the other. 我需要在Grails中编写Domain类约束,它表示一个整数字段必须大于或等于另一个整数字段。

When I write the code like this: 当我写这样的代码时:

class MyDomain {

 String title
 int valueMin = 1
 int valueMax = 1

 static constraints = {
  valueMin(min:1)
  valueMax(min:valueMin)
 }
}

I'm getting error: 我收到错误:

Caused by: groovy.lang.MissingPropertyException: No such property: valueMin for class: MyDomain

Any idea, please? 好吗,拜托?

http://grails.org/doc/latest/ref/Constraints/validator.html http://grails.org/doc/latest/ref/Constraints/validator.html

This should more or less work (not tested) 这应该或多或少的工作(未测试)

class MyDomain {

 String title
 int valueMin = 1
 int valueMax = 1

 static constraints = {
  valueMin(min:1)
  valueMax(validator:{
    value, reference ->
    return value > reference.valueMin
  })
 }
}

This wont work, because the constraints are a static block of code which will only have access to static variables. 这不会起作用,因为约束是一个静态的代码块,只能访问静态变量。

So, you could write your own customized cosntraint if you want: take a look at this link: http://grails.org/doc/latest/guide/single.html#7 . 因此,如果需要,您可以编写自己的自定义cosntraint:查看此链接: http ://grails.org/doc/latest/guide/single.html#7。 Validation 验证

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