如何在Grails中将普通对象呈现为JSON，XML？

Question

I have a controller ( RestfulController ) code similar to the following:

def doSomethingAwesome() {
    Domain domainObject = prepareDomainObject()
    //do something on the domain object
    Model model = new Model(name: domainObject.name, description: domainObject.description)
    respond model
}

As can be seen, I'm trying to respond with data wrapped inside a Model object. However, Model class is not a domain class; it's just a plain Groovy class. When I try to test this code in isolation, I get it to pass, but when I test it with all the other tests, I get GroovyCastException saying the object cannot be cast to JSON.

Some of the articles that came up of my searches suggest I put the model object inside a map then have that map get rendered. Something like:

render ['model': model] as JSON

However, this isn't how I'd like the response message to be. In addition, the XML message would look very different.

Answer 1

The Grails 2.4.3 demo project at https://github.com/jeffbrown/pogorespond demonstrates passing a POGO (not a domain class) to the respond method. https://github.com/jeffbrown/pogorespond/blob/1646c64fe2b37856fc87b64ae1cf5a6c4fd44cb1/grails-app/controllers/demo/DemoController.groovy contains the following:

package demo

class DemoController {

    static responseFormats = ['json']

    def index() {
        def m = new Model(name: 'Some Name', description: 'Some Description')
        respond m
    }
}

class Model {
    String name
    String description
}