10.10.4 Rendering Domain Classes with JSON Views

Typically your model may involve one or many domain instances. JSON views provide a render method for rendering these.

For example given the following domain class:

class Book {
    String title
}

And the following template:

model {
    Book book
}
json g.render(book)

The resulting output is:

{id:1, title:"The Stand"}

You can customize the rendering by including or excluding properties:

json g.render(book, [includes:['title']])

Or by providing a closure to add additional JSON output:

json g.render(book) {
    pages 1000
}