Grails:按名称查找域类

Question

我想允许用户遍历域类并打印出转储的东西.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]
  }
}

上面的这些行根本不起作用.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.

Answer 1

如果你知道完整的包,你可以使用这个:

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.

如果您使用包但用户只提供没有包的类名,并且名称在所有包中都是唯一的,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)