java - grails one-to-many relationship - Stack Overflow

java - grails one-to-many relationship - Stack Overflow

For testing purpose you can load some data into the bootstrap:

class BootStrap {
  def init = { servletContext ->
    def writer = new Author(name:"Jane")
    writer.save()
    if(writer.hasErrors()){
       println writer.errors
    }
    def comic = new Book(name: "superman", Author: writer)
    comic.save()
    if(comic.hasErrors()){
       println comic.errors
    }
  }
def destroy = {}
}

This way your app will have an Author and a Book in it.

Also this tutorial helped me very much.