Connection between three controllers rails - ruby-on-rails

Question

I have three controllers - users, stories, categories. I want when I am logged in as a administrator to create categories and then to write stories for every category. I did part of the task but in DB in table Stories category_id is empty and I cannot understand how to fix it. Here is part of my code:
stories/new.html.erb:
<%= form_for(#story) do |f| %>
<div class="field">
<%= f.label :title %><br />
<%= f.text_field :title %>
</div>
<div class="field">
<%= f.label :category %><br />
<%= f.collection_select :category_id, #categories, :id, :title %>
</div>
<div class="field">
<%= f.label :content %><br />
<%= f.text_area :content %>
</div>
<div class="actions">
<%= f.submit "Add" %>
</div>
<% end %>
stories_controller.rb:
class StoriesController < ApplicationController
before_filter :admin_user
def new
#story = Story.new
#categories = Category.all
#title = "Add news"
end
def create
#categories = Category.all
#story = current_user.stories.build(params[:story])
if #story.save
flash[:success] = "Successfullly added news"
redirect_to #story
else
#title = "Add news"
render 'new'
end
end
private
def admin_user
redirect_to(root_path) unless current_user.admin?
end
end
story.rb:
class Story < ActiveRecord::Base
attr_accessible :title, :content
belongs_to :user
belongs_to :category
validates :title, :presence => true
validates :content, :presence => true
validates :user_id, :presence => true
default_scope :order => 'stories.created_at DESC'
end
category.rb:
class Category < ActiveRecord::Base
attr_accessible :title
has_many :stories
validates :title, :presence => true,
:length => { :within => 6..40 }
end
user.rb:
class User < ActiveRecord::Base
attr_accessor :password
attr_accessible :name, :email, :password, :password_confirmation
has_many :stories
validates :name, :presence => true,
:length => { :maximum => 50 }
validates :email, :presence => true
email_regex = /\A[\w+\-.]+#[a-z\d\-.]+\.[a-z]+\z/i
validates :email, :presence => true,
:format => { :with => email_regex },
:uniqueness => true
validates :password, :presence => true,
:confirmation => true,
:length => { :within => 6..40 }
before_save :encrypt_password
def has_password?(submitted_password)
encrypted_password == encrypt(submitted_password)
end
def self.authenticate(email, submitted_password)
user = find_by_email(email)
return nil if user.nil?
return user if user.has_password?(submitted_password)
end
def self.authenticate_with_salt(id, cookie_salt)
user = find_by_id(id)
(user && user.salt == cookie_salt) ? user : nil
end
private
def encrypt_password
self.salt = make_salt unless has_password?(password)
self.encrypted_password = encrypt(password)
end
def encrypt(string)
secure_hash("#{salt}--#{string}")
end
def make_salt
secure_hash("#{Time.now.utc}--#{password}")
end
def secure_hash(string)
Digest::SHA2.hexdigest(string)
end
end

Answer 1

You need add attr_accessible :category_id to your story model
Its preventing mass assignment in your controllers create method. Alternatively you could pull out the category_id from your params hash and assign it on a separate line.