Rails plugin for overriding attr_accessible protection.
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Trusted Params

Rails plugin which adds a convenient way to override attr_accessible protection.

If you are unfamiliar with the dangers of mass assignment please check these links


You can install this as a plugin into your Rails app.

script/plugin install git://github.com/ryanb/trusted-params.git


This plugin does several things.

  • Adds “trust” method on hash to bypass attribute protection

  • Disables attr_protected because you should use attr_accessible.

  • Requires attr_accessible be specified in every model

  • Adds :all as option to attr_accessible to allow all attributes to be mass-assignable

  • Raises an exception when assigning a protected attribute (instead of just a log message)


When using this plugin, you must define attr_accessible in every model to allow mass assignment. You can use :all to mark all attributes as accessible.

class Comment < ActiveRecord::Base
  attr_accessible :all

However, only do this if you want all attributes accessible to the public. Many times you will want to limit what the general public can set.

class Comment < ActiveRecord::Base
  attr_accessible :author_name, :email, :content

Administrators should be able to bypass the protected attributes and set anything. This can be done with the “trust” method.

def create
  params[:comment].trust if admin?
  @comment = Comment.new(params[:comment])
  # ...

You can mark certain attributes as trusted for different roles

params[:comment].trust(:spam, :important) if moderator?

Then only those attributes will be allowed to bypass mass assignment.