有没有一种简单的方法可以将Rails ActiveRecord模型设置为只读？ [英] Is there an easy way to make a Rails ActiveRecord model read-only?

问题描述

我希望能够在数据库中创建一条记录，但是从那以后阻止Rails进行更改。我知道在数据库级别仍然可以进行更改。

I want to be able to create a record in the DB but then prevent Rails from making changes from that point on. I understand changes will still be possible at the DB level.

我相信attr_readonly可以满足我在属性级别上的要求，但是我不想手动指定字段...我宁愿有更多的白名单方法。

I believe attr_readonly does what I want on an attribute level, but I don't want to have to manually specify fields... I would rather have more of a white-list approach.

此外，我知道关联有一个：read_only选项，但我不想将对象的只读性限制为是否通过关联获取。

Also, I know there is a :read_only option for associations, but I don't want to limit the "readonlyness" of the object to if it was fetched via an association or not.

最后，我希望仍然能够销毁记录，因此：depend =>：destroy在关联中起作用。

Finally, I want to be able to still destroy a record so stuff like :dependent => :destroy works in the associations.

因此，总结一下：1）允许创建记录，2）允许删除记录，和3）防止更改已保留的记录。

So, to summarize: 1) allow the creation of records, 2) allow the deletion of records, and 3) prevent changing records that have been persisted.

推荐答案

查看 ActiveRecord :: Persistence ，一切最终都在幕后调用 create_or_update 。

def create_or_update
  raise ReadOnlyRecord if readonly?
  result = new_record? ? create : update
  result != false
end

所以！只是：

def readonly?
  !new_record?
end

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