Grails2.2.4一对多不使用条件查询

我有一个域结构，如：

class Conversation{
static hasMany=[receivers:User]

}

及

我想找到不属于特定用户的对话（使用标准而不是HQL）

我尝试了以下查询，但得到了空集

def user=User.get(3)

Conversation.createCriteria().list{
       receivers{
 //all options didn't work for me...
 //ne('id',user.id) 
//not{eq('id',user.id)}
not{'inList'('id',[user.id])}

        }
}

任何帮助都将不胜感激

谢谢

我会使用HQL

Conversation.executeQuery("select c from Conversation c left join c.receivers as receivers where :user not in receivers",[user: User.get(3)])

Conversation.executeQuery("select c from Conversation c left join c.receivers as receivers where :user not in receivers",[user: User.get(3)])