Question

I want to reuse the same logic in controllers for both html-view and RESTful API.
What is the best way to do this in Grails?

Answer 1

I believe you’re looking for the withFormat method:

(code here taken from that link with JSON added)

import grails.converters.XML
import grails.converters.JSON

class BookController {

    def list() {
        def books = Book.list()

        withFormat {
            html bookList:books
            js { render books as JSON }
            xml { render books as XML }
        }
    }
}