Association proxy create

A Feed has many Subscriptions

class Feed < ActiveRecord::Base
  has_many :subscriptions
end

class Subscription < ActiveRecord::Base
  belongs_to :feed, :counter_cache => true
  belongs_to :user
end

This does not work
  ch = Channel.find(:first)
  ch.feeds.create(:user_id => 1, :score => 0.0)

user_id and score columns must be non-null, SQL INSERT sets them NULL.
Nor does it work with string keys instead of symbols.

This does:
  ch = Channel.find(:first)
  ch.feeds.create do |f|
    f.user_id = 1
    f.score = 0.0
  end

According to AWDWR 1st and http://rails.rubyonrails.org/ both should behave
the same. What has changed or I am doing wrong.

TIA,
  Jeffrey

It's possible that the attributes aren't getting assigned because
they're protected. Do you have attr_protected or attr_accessible
declared anywhere in your model?

This is on Rails 2.3.2.

Quoting Jeffrey L. Taylor <ror@abluz.dyndns.org>:

Pat,
  Head slap, yes that is precisely the problem. Thanks for seeing into my
blind spot.

Jeffrey

Quoting Pat Nakajima <patnakajima@gmail.com>:

It's possible that the attributes aren't getting assigned because
they're protected. Do you have attr_protected or attr_accessible
declared anywhere in your model?

[snip]