Getting "Can't mass-assign protected attributes:" for nested_attributes

Question

I am on Rails3, I have two model, User, and Post. User has Posts as nested attributes. when I try to save user then I am getting Can't mass-assign protected attributes:.....

Answer 1

if the model definitions are like as follows:

user.rb

class User < ActiveRecord::Base
  attr_accessible  :name, :posts_attributes
  has_many :posts
  accepts_nested_attributes_for :posts
end

post.rb

class Post < ActiveRecord::Base
  attr_accessible :title, :content :user_id
end

then everything should be fine. You can save user with posts as nested attributes.

Here is a sample codes for the beginners :)

https://github.com/railscash/sample_change_user_role