示例应用程序:https://github.com/Hi-Fi/writetable-example-with-grails
在示例应用程序中,控制器在通过GSP页面使用或使用CURL表单发布时工作正常。带卷曲的命令:
curl "http://localhost:8080/junk/team/save" --data "name=team&players"%"5B0"%"5D.firstName=first&players"%"5B0"%"5D.lastName=last&players"%"5B0"%"5D.position=position&create=Create" --compressed.
问题在于使用JSON的相同请求,它创建相同的(根据dump())对象,但不能保存嵌套值。
使用SOAPUI(localhost:8080 / junk / api / rest)进行POST后:
{
name: "Team name",
players: [
{
firstName: "Player first name",
lastName: "Player last name",
position: "Player position"
}
]
}
我得到错误:
| Error 2014-12-20 21:02:47,050 [http-bio-8080-exec-1] ERROR hibernate.AssertionFailure - an assertion failure occured
(this may indicate a bug in Hibernate, but is more likely due to unsafe use of the session)
Message: null id in junk.Player entry (don't flush the Session after an exception occurs)
Line | Method
->> 1145 | runWorker in java.util.concurrent.ThreadPoolExecutor
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
| 615 | run in java.util.concurrent.ThreadPoolExecutor$Worker
^ 744 | run . . . in java.lang.Thread
即使存在此错误,父对象(团队)仍然保存。使用Hibernate4整个保存失败,因此更新它并没有帮助。
答案 0 :(得分:0)
解决此问题的一种方法是明确地将“团队”与每个“玩家”联系起来,如
team.players.each {it.team = team}
使用表单发布时,此步骤是自动生成的,但由于某些原因不适用于JSON。在JSON中创建Team对象后的Player对象:
<junk.Player@76f8539e firstName=first lastName=last position=position deleted=false errors=grails.validation.ValidationErrors: 0 errors $changedProperties=null id=null version=null team=null>
表格POST:
<junk.Player@1ba14c1b firstName=first lastName=last position=position deleted=false errors=grails.validation.ValidationErrors: 0 errors $changedProperties=null id=null version=null team=junk.Team : (unsaved)>
这可能不是“正确”的解决方案,所以我仍然很高兴听到嵌套的一对多列表是否有更好的解决方案。