Model.create() throws errors with readonly attributes

Question

I have the following model in rails (simplified):

class Phone < ActiveRecord::Base
  include ActiveModel::Validations
  belongs_to :user
  belongs_to :brand
  attr_readonly :user, :brand
  attr_accessible :model, :phone_number

  validates :user, :presence => true
  validates :brand, :presence => true
  validates :model, :presence => true
  validates :phone_number, :presence => true
end

According to the documentation, attr_readonly should allow attributes to be set at creation, but not at update.

However, when I do this:

Phone.create(:user => <existing_user>, :brand => <existing_brand>, :model => "Galaxy", :phone_number => "555-433-5678")

I get this error:

Can't mass-assign protected attributes user, brand

What am I missing?

Ryan Bigg · Accepted Answer · 2012-12-14 03:21:25Z

3

If you want to assign a user and a brand association like that, you must define them as being accessible attributes:

attr_accessible :user, :brand

Otherwise, you can assign them like this:

Model.create({:user => user, :brand => brand }, :without_protection => true)

edited Dec 14, 2012 at 3:21

answered Dec 14, 2012 at 2:03

Ryan Bigg

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2 Comments

Bryce Over a year ago

Ryan, it's a bit more complicated than that, since the model has two associations (I updated the example). Even if I use the association builder for one of the belongs_to associations, I get the error for the other association.

Bryce Over a year ago

Ryan - setting them as accessible defeats the purpose a bit. I want the associations to be set at creation and then never altered; how would I achieve that if not via a attr_readonly setting?

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