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我正在使用Grails 1.3.6,并且遇到保存级联问题时出现问题。问题是具有两个父类的类。什么我试图简化版本是这样的:Grails/GORM以错误的顺序保存
class Location {
String city
static hasMany = [authors: Author, publishers: Publisher]
}
class Author {
String name
static belongsTo = [location: Location]
static hasMany = [books: Book]
}
class Publisher {
String name
static belongsTo = [location: Location]
static hasMany = [books: Book]
}
class Book {
String title
static belongsTo = [author: Author, publisher: Publisher]
}
class Srv1Service {
static transactional = true
def loadData() {
def l1 = new Location(city: "London")
def a1 = new Author(name: "Graham Greene")
l1.addToAuthors(a1)
def p1 = new Publisher(name: "Some Press")
l1.addToPublishers(p1)
def b1 = new Book(title: "The Comedians")
a1.addToBooks(b1)
p1.addToBooks(b1)
l1.save()
}
}
如果我运行上面的loadData,图书实例被保存在发布实例之前,导致错误“不空属性引用null或瞬时值:adhoc.Book.publisher“。
我已经尝试了各种不同的方式来定义关系,但很少成功。我已经尝试过临时保存,这确实有效,但是我可以看到,父表被更新为我保存子数据 - 即位置,作者和发布者都更新到版本1.(并且我想保留代码尽可能简单。)我想避免链接表。
任何建议感激地收到!