如何對Grails中的域屬性進行變量插值？

Question

我是Grails的新手，一直在研究如何對服務調用的域屬性進行變量插值。

我的域名看起來是這樣的：

class MonthlyResult { 

FilterType type 
String typeId 
Integer year 
Integer january = 0 
Integer february = 0 
Integer march = 0 
Integer april = 0 
Integer may = 0 
Integer june = 0 
Integer july = 0 
Integer august = 0 
Integer september = 0 
Integer october = 0 
Integer november = 0 
Integer december = 0 

，我試圖做到這一點對我MonthlyResult monthlyResult： monthlyResult $ {MONTHNAME} 其中MONTHNAME是該月的名稱的字符串，我想。

Answer 1

就這麼簡單

String monthName = 'january' 
assert 42 == new MonthlyResult(january:42)[ monthName ] 

而且，我寧願在這樣的域中使用map類，鍵入一些枚舉值：

class MonthlyResult { 

    Enum Month { january, february, .... } 

    Map<Month,Integer> months 
} 

Answer 2

你只需要添加雙引號：

def monthName = 'january' 
def monthlyResult = new MonthlyResult​() 
println monthlyResult."​${monthName}​​"​ 

輸出：

0