如何防止在Rails中更新单个属性? [英] How to prevent updating a single attribute in Rails?

问题描述

提交表单后，如何防止在Rails中更新单个属性?其他所有属性都应更新.

When a form is submitted, how to prevent a single attribute from being updated in Rails? All other attributes should be updated.

是before_save，attr_reader还是其他方式?

如果使用before_save，如何访问属性哈希?

If using before_save, how to access to the attributes hash?

Rails 3.0.7

Rails 3.0.7

推荐答案

签出 现在，作为对update_attributes的调用的一部分，您将指定:update角色，例如

Now as part of a call to update_attributes, you'd specify the :update role, for example

klass = YourModel.find(some_id)
klass.update_attributes(params[:your_model], as: :update)

如果在传递给update_attributes的params中设置了:the_one_column，则会引发错误.

If :the_one_column is set in params passed to update_attributes, it will throw an error.

正如@Beerlington在对您的问题的评论中提到的那样，您还应该查看

As @Beerlington mentioned in his comment to your Question, you should also check out attr_accessible. It's generally better to spend the 30 minutes going through all models of your application white-listing attributes using attr_accessible than it is to blacklist specific attributes with attr_protected.

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