我是grails的新手，我试图在grails中实现存档。也就是说，当我尝试从列表中删除项目时，它必须在列表中删除，但不能在数据库中删除。并且在数据库中，标记将出现在列表中的已删除项目上。
请指导我解决这个问题。

请您参考如下方法:

您将在相关域中添加一个active bool(boolean) 值字段，以便可以将相关对象标记为 Activity 或不 Activity 。您还必须在适当的域 Controller 中自定义delete Action ，以便不删除该对象，因为要删除而不是删除，您只想将active bool(boolean) 值更改为false即可。然后，在适当的域 Controller 的列表操作中，您必须在列出所有非 Activity 对象之前将其过滤掉。

更新:

请参阅下面的代码，以对我的建议进行简单说明。

//The User domain class 
class User { 
    String username 
    boolean active = true     
} 
 
//The delete action of the User controller 
def delete = { 
        def userInstance = User.get(params.id) 
        if (userInstance) { 
            //Here instead of deleting the user, we just mark the user as inactive. 
            userInstance?.active = false 
            //You may choose to change this message to something that indicates the user is 
            //now inactive instead of deleted since the user is not really being deleted. 
            flash.message = "${message(code: 'default.deleted.message', args: [message(code: 'user.label', default: 'User'), params.id])}" 
            redirect(action: "list") 
        } 
        else { 
                flash.message = "${message(code: 'default.not.found.message', args: [message(code: 'user.label', default: 'User'), params.id])}" 
                redirect(action: "list") 
        } 
}    
 
//The list action of the User controller 
def list = { 
        def users = User.findAll("from User as users where users.active=false") 
        //Instead of writing "userInstance: User.list()" I filtered out all inactive users 
        //and created the "users" object then wrote "userInstance: users". Build in other 
        //parameters as you see fit. 
        [userInstanceList: users]     
}