adding a foreign key in the table - ruby-on-rails

Question

I keep getting this exception: "SQLite3::SQLException: no such column: books.user_id: SELECT "books".* FROM "books" WHERE ("books".user_id = 4)". Which sounds like there is no user_id in the books table.
So I just installed the Foreigner plugin and added "t.integer :user_id, :null => false" and "add_foreign_key(:books, :users)" in the book migration file. I ran "rake db:migrate", but still it is giving me the same exception.
I am using Rails 3 in Windows and Devise to authenticate user.
HOME VIEW
<p><%= link_to "Add new Book",:controller =>"book", :action => 'new' %></p>
<% #books.each do |b| %>
<p><%= b.author%></p>
<p><%= b.title%></p>
<%end%>
HOME CONTROLLER
class HomeController < ApplicationController
def index
#user = current_user
#user.books||=Book.new
#books=#user.books
end
end
BOOK CONTROLLER
class BookController < ApplicationController
def new
#books = Book.new
# redirect_to :controller=>"home" ,:action=>"index"
end
def create
#books = Book.new(params[:book])
if #books.save
render "home/index"
#redirect_to :controller=>"home" ,:action=>"index"
else
render :action => 'new'
end
end
CREATE TABLE/BOOK MIGRATION
class CreateBooks < ActiveRecord::Migration
def self.up
create_table :books do |t|
t.text :title
t.text :author
t.integer :user_id, :null => false
t.timestamps
end
add_foreign_key(:books, :users)
end
BOOK VIEW
<h1>Book#new</h1>
<%= form_for(:book) do |f| %>
<p><%= f.text_field :title %></p>
<p><%= f.text_field :author %></p>
<p><%= f.submit "Add book"%>
BOOK MODEL
class Book < ActiveRecord::Base
belongs_to :user
end
USER MODEL
class User < ActiveRecord::Base
has_many :books
# Include default devise modules. Others available are:
# :token_authenticatable, :lockable, :timeoutable and :activatable
devise :database_authenticatable, :registerable,
:recoverable, :rememberable, :trackable, :validatable
# Setup accessible (or protected) attributes for your model
attr_accessible :email, :password, :password_confirmation,:firstname,:lastname,:school,:major,:sex,:zipcode
end
ROUTE
Campus::Application.routes.draw do
get "book/index"
get "book/edit"
get "book/new"
get "home/edit"
devise_for :users
resources :book
root :to=> "home#index"
match '/book/new' =>"home#index"
end
DATABASE SCHEMA
ActiveRecord::Schema.define(:version => 20110609055608) do
create_table "books", :force => true do |t|
t.text "title"
t.text "author"
t.integer "user_id", :null => false
t.datetime "created_at"
t.datetime "updated_at"
end
create_table "courses", :force => true do |t|
t.string "name"
t.datetime "created_at"
t.datetime "updated_at"
end
create_table "strong_ins", :force => true do |t|
t.string "subject"
t.string "topic"
t.text "description"
t.datetime "created_at"
t.datetime "updated_at"
end
create_table "users", :force => true do |t|
t.string "email", :default => "", :null => false
t.string "encrypted_password", :limit => 128, :default => "", :null => false
t.string "password_salt", :default => "", :null => false
t.string "reset_password_token"
t.string "remember_token"
t.datetime "remember_created_at"
t.integer "sign_in_count", :default => 0
t.datetime "current_sign_in_at"
t.datetime "last_sign_in_at"
t.string "current_sign_in_ip"
t.string "last_sign_in_ip"
t.datetime "created_at"
t.datetime "updated_at"
t.string "firstname"
t.string "lastname"
t.text "school"
t.text "major"
t.string "sex"
t.integer "zipcode"
end
add_index "users", ["email"], :name => "index_users_on_email", :unique => true
add_index "users", ["reset_password_token"], :name => "index_users_on_reset_password_token", :unique => true
create_table "weak_ins", :force => true do |t|
t.string "subject"
t.string "topic"
t.text "description"
t.datetime "created_at"
t.datetime "updated_at"
end
end

Answer 1

The user_id column should appear in the schema after running the migration. It's not in your listing, so I'd say that's the problem. Make sure rake db:migrate is completing without errors. You can redo the migration with rake db:rollback && rake db:migrate, if necessary.