The Grails Framework 5.2.3

(Quick Reference) ## defaultAction ### Purpose Specifies the default action to be executed if none is specified in the URI. This is unnecessary if you have an action named "index" and want it to be the default, since that happens automatically. ### Examples
    class BookController {

        static defaultAction = "list"

        def list() {
            [books: Book.list()]
        }

        def show() {
            [bookInstance: Book.get(params.id)]
        }
    }
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