如何获得的activerecord模型，可以是属性列表质量分配 [英] How to get the list of attributes of a activerecord model that can be mass-assigned

问题描述

我想有可大规模分配的所有属性名称的列表。我需要这样一个自定义表单生成器，不会在默认情况下无法大规模分配添加输入字段。例如，如果我有这样一个模型：

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. For example if I have a model like :

class Post < ActiveRecord::Base
  attr_protected :account

  belongs_to :author

  validates_presence_of :title, :author
end

我想有结果包含列表：作者：标题

I would like to have as a result a list containing :author, :title.

如果这样的方法存在任何想法？或者一些对我怎么可以让一个没有这种指引？

Any idea if such a method exists? Or some guidelines on how I can make one that does this?

推荐答案

Post.accessible_attributes将覆盖它，如果你明确定义attr_accessible

Post.accessible_attributes would cover it if you explicitly defined attr_accessible

限制，即，做这样的事情是笨重的，但作品：

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

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

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