(Quick Reference) # 10.1.9.5 JSON Views by Convention Version: 3.2.8 ## 10.1.9.5 JSON Views by Convention There are a few useful conventions you can follow when creating JSON views. For example if you have a domain class called `Book`, then creating a template located at `grails-app/views/book/_book.gson` and using the respond method will result in rendering the template:
    def show(Long id) {
        respond Book.get(id)
    }
In addition if an error occurs during validation by default Grails will try to render a template called `grails-app/views/book/_errors.gson`, otherwise it will try to render `grails-app/views/errors/_errors.gson` if the former doesn’t exist. This is useful because when persisting objects you can `respond` with validation errors to render these aforementioned templates:
    @Transactional
    def save(Book book) {
        if (book.hasErrors()) {
            transactionStatus.setRollbackOnly()
            respond book.errors
        }
        else {
            // valid object
        }
    }
If a validation error occurs in the above example the `grails-app/views/book/_errors.gson` template will be rendered. For more information on JSON views (and Markup views), see the JSON Views user guide. | Quick Reference (hide)