Question

Grails中render obj as JSON时出现的问题：obj中有一个属性为另一个实体类对象，为什么不能把它转换完全？

实体类：
class SuperHello {
String sex
int age
}

class Hello {
String name
double weight
double height
SuperHello sp
}

转换代码：
Hello p = new Hello(name:"luobo")
SuperHello spp = new SuperHello()
spp.id = 2
spp.sex = "man"
p.sp = = new SuperHello()
render p as JSON

运行结果：
{"class":"hellotest.Hello","id":null,"height":0,"name":"luobo","sp":{"class":"SuperHello","id":2},"weight":0}

Answer 1

Hello p = new Hello(name:"luobo")
SuperHello spp = new SuperHello()
spp.age = 2 //id通常是自增的，不能指定。

spp.sex = "man"
spp.save(flush:true);//保存之后才会存到数据库中。
p.sp = spp
p.save(flush:true)

render p as JSON

Answer 2

p.sp = new SuperHello()换成 = p.spspp

追问

这里是我打错了 我用的是 p.sp = spp

追答

昂 这个是有个设置全加载的 默认是只记id 跟hb的懒加载差不多 至于怎么写 忘了 以前用过grails