/* Book domain class */
class Book {
	int pages
	String title
}

/* Author domain class */
class Author {
	String name
	Date birthDate
}

/* registering custom marshallers in Bootstrap.groovy */
import grails.converters.JSON

class BootStrap {

	def init = { servletContext ->
		JSON.registerObjectMarshaller(Author){	author, json ->
			def birthday = author.birthDate
			json.build{
				"class(author)"
				id(author.id)
				name(author.name)
				info{
					birthdate(year: birthday.year, month: birthday.month, day: birthday.day)
				}
			}
		}
		
		JSON.registerObjectMarshaller(Book){	book, json ->
			json.build{
				"class(book)"
				id(book.id)
				info{
					pages(book.pages)
				}
			}
		}
	}
}

/* code for output in controller */
def list = {
	params.max = Math.min( params.max ? params.max.toInteger() : 10,  100)
	def authors = Author.list( params )
	withFormat{
		json{
			render authors as JSON
		}
		html{
			[ authorInstanceList: authors, authorInstanceTotal: Author.count() ]
		}
	}
}

/* Book domain class */
class Book {
	int pages
	String title
}

/* Author domain class */
class Author {
	String name
	Date birthDate
}

/* registering custom marshallers in Bootstrap.groovy */
import grails.converters.JSON

class BootStrap {

	def init = { servletContext ->
		JSON.registerObjectMarshaller(Author){	author, json ->
			def birthday = author.birthDate
			json.build{
				"class(author)"
				id(author.id)
				name(author.name)
				info{
					birthdate(year: birthday.year, month: birthday.month, day: birthday.day)
				}
			}
		}
		
		JSON.registerObjectMarshaller(Book){	book, json ->
			json.build{
				"class(book)"
				id(book.id)
				info{
					pages(book.pages)
				}
			}
		}
	}
}

/* code for output in controller */
def list = {
        params.max = Math.min( params.max ? params.max.toInteger() : 10,  100)
				def authors = Author.list( params )
				withFormat{
					json{
						render authors as JSON
					}
					html{
						[ authorInstanceList: authors, authorInstanceTotal: Author.count() ]
					}
				}
    }

Expected Behaviour
==================

*	Both classes should be rendered in the specified custom format when `store/book/list.json` is loaded.
*	Order of how the marshallers are added should not matter.
*	It should be possible to register more than one custom object marshallers.


Bug
===

*	Only the first registered marshaller is picked up as expected.
*	The second one is ignored and the default JSON generated by Grails is returned.
*	The order of the calls to `registerObjectMarshaller` matters, such that if the Book marshaller is added first, that one works. However if the Author marshaller is first, that one works.

registerObjectMarshaller in Grails 1.1, suspected Bug

groovy

Groovy