Having a problem adding a foreign key

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 books
table.So i just installed foreigner plugin and added "
t.integer :user_id, :null => false" and
“add_foreign_key(:books, :users)” in book migration and 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

<%= link_to “Add new Book”,:controller =>“book”, :action =>
‘new’ %>


<% @books.each do |b| %>

<%= b.author%>


<%= b.title%>


<%end%>
HOME CONTROLLER
   class HomeController < ApplicationController
   def index
  @user = current_user
  @user.books||=Book.new
  @[email protected]
  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

Book#new

<%= form_for(:book) do |f| %>

<%= f.text_field :title %>

<%= f.text_field :author %>

<%= 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.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

end

On Jun 11, 1:41am, dave [email protected] wrote:

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 books
table.So i just installed foreigner plugin and added "
t.integer :user_id, :null => false" and
“add_foreign_key(:books, :users)” in book migration and 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.

If you edit a migration that has already been run, rails doesn’t know
that you want to run it again. Either revert the changes to the first
migration and add a second migration that adds the new column, or run
rake db:migrate:redo to tell rails to undo the latest migration and
then run it again (this will drop your books table and recreate it -
don’t do this if you have data you want to keep).

Fred

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