grails hiberate discard（）被忽略了(grails hiberate discard() being ignored)

grails hiberate discard（）被忽略了(grails hiberate discard() being ignored)

我有一个修改和实例然后链接到另一个动作的动作。 如果实例上有错误，我想忽略我所做的更改。 但是，discard（）方法不起作用。 状态更改始终保持不变。 我究竟做错了什么？

def reject={ def notice=Notice.get(params['id']); if(!notice){ flash.message="Could Not Find Notice With ID:"+params.id; redirect(action:'list'); return; } flash.messages=[:]; flash.errors=[:]; notice.status=NoticeType.REJECTED; if(!notice.hasErrors() && notice.save(flush:true)){ //success message flash.messages.notice_tab=["Notice Was Successfully Flagged As Rejected"]; } } else{ //error message flash.errors.notice_tab=[]; notice.errors.allErrors.each{ flash.errors.notice_tab.push(it); } notice.discard(); //THIS DOES NOTHING???? } chain(action:'edit', id:params['id'] ) return; }

我也试过notice.refresh（）将值设置回原始值。 没关系。 仍然坚持我设定的新价值观。 我将链改为重定向，同样的事情发生了。

I have an action which modifies and instance and then chains to another action. If there are errors on the instance I want to ignore changes I have made. However, the discard() method doesn't work. The status change is always persisted. What am I doing wrong?

def reject={ def notice=Notice.get(params['id']); if(!notice){ flash.message="Could Not Find Notice With ID:"+params.id; redirect(action:'list'); return; } flash.messages=[:]; flash.errors=[:]; notice.status=NoticeType.REJECTED; if(!notice.hasErrors() && notice.save(flush:true)){ //success message flash.messages.notice_tab=["Notice Was Successfully Flagged As Rejected"]; } } else{ //error message flash.errors.notice_tab=[]; notice.errors.allErrors.each{ flash.errors.notice_tab.push(it); } notice.discard(); //THIS DOES NOTHING???? } chain(action:'edit', id:params['id'] ) return; }

I also tried notice.refresh() to set values back to original. Didn't matter. Still persisted the new values I set. I changed the chain to a redirect and the same things happened.

最满意答案

一种解决方案是使用命令对象而不是域对象。 然后，在命令对象上成功完成验证后，您可以将值复制到域对象，然后保存以避免Hibernate丢弃。

One solution would be to use a Command Object instead of a Domain Object. Then once validation is done successfully on your Command Object you can copy the values to the Domain Object and then save to avoid the Hibernate discard.