对于具有复合键的Domain类，获取“ MissingPropertyException：无此类属性”错误

Question

I am using Groovy/Grails Tool Suite Version: 3.6.4.RELEASE with Grails2.4.4 and JRE1.8 . In a very simple scaffold project, I have a domain class called Book and trying to create a composite key. But after I run the project and as I click on 'Create New Book' link, I get error : "Caused by MissingPropertyException: No such property: generator for class: org.codehaus.groovy.grails.orm.hibernate.cfg.CompositeIdentity"

My Book class looks as below:

class Book implements Serializable{
    String title;
    String author;

    static constraints = {
        title (blank: false)
        author (blank: false)
    }
    static mapping = {
        id composite: ['title','author']
    }
}

Any help is appreciated.

Answer 1

It looks like, it is looking for generator . Try this:

id composite: ['title','author'], generator: 'assigned'