本文介绍了使用对象访问属性。“$ {property}”的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
class可筛选{
def statusId
def secondaryFilterable
...
def filter = new Filter（validIds：[1]，fieldName：'statusId'）
...
class Filter {
def validIds = [] as Set
def fieldName
private boolean containsFieldValue（input）{
def fieldValue = input。$ {fieldName}
return fieldValue in validIds
}
}
罚款一个财产。然而，现在我需要通过二次过滤来过滤 - 就像
def filter = new Filter（validIds：[1]， fieldName：'secondaryFilterable.statusId'）
抛出 groovy.lang。 MissingPropertyException 。任何建议？
解决方案
引用的属性假定一个点是属性名称的一部分。 $ b
一个简单的解决方案是：
...
def fieldValue = fieldName.split（/ \ ./）。inject（input）{parent，property - > parent？。$ property}
...
这将递归查找字段值，使用点符号表示子元素。
。
I'm working on some dynamic filtering, and have this:
class Filterable {
def statusId
def secondaryFilterable
}
...
def filter = new Filter(validIds: [1], fieldName: 'statusId')
...
class Filter {
def validIds = [] as Set
def fieldName
private boolean containsFieldValue(input) {
def fieldValue = input."${fieldName}"
return fieldValue in validIds
}
}
Which works just fine for one property. However, now I need to filter by the secondary filterable - something like
def filter = new Filter(validIds: [1], fieldName: 'secondaryFilterable.statusId')
Which throws a groovy.lang.MissingPropertyException. Any advice?
解决方案
Quoted properties assume a dot is part of the property name.
A simple solution would be:
...
def fieldValue = fieldName.split(/\./).inject(input){ parent, property -> parent?."$property" }
...
This will recursively look up the field value using dot notation for child properties.
I put up a working example here on the Groovy web console.
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