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@Mohammed Faisal Try this, this code works for me, but I'm not clear about your front-end operation.

class AuthorController {

    def removeBook(Long authorId, Long bookId) {
        def author = authorService.get(bookId)
        def bookToRemove = bookService.get(bookId)

        if (bookToRemove) {
            author.removeFromBooks(bookToRemove)

            authorService.save(author)
        }

        request.withFormat {
            '*'{ render status: NO_CONTENT }
        }
    }

}

@Michael Yan Thanks for your reply. Your suggested approach works, but I want to remove Books in the

def update(Author author)

method of

AuthorController

generated by the dynamic scaffolding, upon data binding the request parameters - as it correctly does for creating and updating Books. This is the method

def update(Author author) {
        if (author == null) {
            notFound()
            return
        }

        try {
            authorService.save(author)
        } catch (ValidationException e) {
            respond author.errors, view:'edit'
            return
        }

        request.withFormat {
            form multipartForm {
                flash.message = message(code: 'default.updated.message', args: [message(code: 'author.label', default: 'Author'), author.id])
                redirect author
            }
            '*'{ respond author, [status: OK] }
        }
    }

I have attached a screenshot of the UI, where • Add Book button will add a new row to the books table - a simple DOM operation only (book is not added to the database at this point) • Remove Book button will remove a row from the books table - a simple DOM operation only (book is not removed from the database at this point) • Update button will submit the author fields and list of books to the server and this request is handling by the above mentioned

def update(Author author)

of

AuthorController

.

@Mohammed Faisal Your question is too big for me to reply to in detail here. I think what you need is a complete tutorial and real-world solution.