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(Quick Reference)



Determines if a domain class instance is an instance of the specified class, resolving the actual class if the instance is a proxy.


Given the domain classes:

class Container {
   static hasMany = [children: Child]
class Child {
   String name
   static belongsTo = [container: Container]
class Thing extends Child {}
class Other extends Child {}

Then you can determine the type of the elements in a Container’s `children collection using

def container = Container.get(id)
for (child in container.children) {
   if (child.instanceOf(Thing)) {
      // process Thing
   else if (child.instanceOf(Other)) {
      // process Other
   else {
      // handle unexpected type



  • clazz - the type to check