我想允许用户遍历域类并打印出垃圾堆。我的第一个问题:假设以下工作正常:
//this works
class EasyStuffController{
def quickStuff = {
def findAThing = MyDomainClass.findByStuff(params.stuff)
[foundThing:findAThing]
}
}
写下我想说的内容的正确方法是什么:
//this doesn't
class EasyStuffController{ servletContext ->
def quickStuff = {
def classNameString = "MyDomainClass" //or params.whichOne something like that
def domainHandle = grailsApplication.domainClasses.findByFullName(classNameString)
//no such property findByFullName
def findAThing = domainHandle.findByStuff(params.stuff)
[foundThing:findAThing]
}
}
//this also doesn't
class EasyStuffController{ servletContext ->
def quickStuff = {
def classNameString = "MyDomainClass" //or params.whichOne something like that
def domainHandle
grailsApplication.domainClasses.each{
if(it.fullName==classNameString)domainHandle=it
}
def findAThing = domainHandle.findByStuff(params.stuff)
//No signature of method: org.codehaus.groovy.grails.commons.DefaultGrailsDomainClass.list() is applicable
[foundThing:findAThing]
}
}
上面的那些行根本不起作用。我试图让用户能够选择任何域类,并用“东西”取回东西。假设:所有域类都有一个相同类型的Stuff字段。
答案 0 :(得分:44)
如果您知道整个包裹,可以使用:
String className = "com.foo.bar.MyDomainClass"
Class clazz = grailsApplication.getDomainClass(className).clazz
def findAThing = clazz.findByStuff(params.stuff)
如果你不使用包,这也会有效。
如果您使用套餐但用户只提供没有套餐的类名,并且名称在所有套餐中都是唯一的,那么您可以使用:
String className = "MyDomainClass"
Class clazz = grailsApplication.domainClasses.find { it.clazz.simpleName == className }.clazz
def findAThing = clazz.findByStuff(params.stuff)