ActiveRecord：如何获取可以批量分配的模型的所有属性？ [英] ActiveRecord: How to get all attributes of a model that can be mass-assigned?

问题描述

我想要一个可以批量分配的所有属性名称的列表。对于自定义表单生成器，我将需要它，默认情况下不会添加无法批量分配的输入字段。

I would like to have a list of all attribute names that can be mass assigned. I need this for a custom form builder that will not add input fields by default that cannot be mass assigned.

例如，如果我有以下模型：

For example if I have the following model:

class Post < ActiveRecord::Base
  attr_protected :account

  belongs_to :author

  validates_presence_of :title, :author
end

因此，我希望拥有 [：author，：title] 。

推荐答案

如果您明确定义了attr_accessible，则Post.accessible_attributes将覆盖该问题

Post.accessible_attributes would cover it if you explicitly defined attr_accessible

除非这样做，否则这样做很笨拙，但可以：

Barring, that, doing something like this is clunky but works:

Post.new.attributes.keys - Post.protected_attributes.to_a

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