NoMethodError in Devise::SessionsController#create undefined method `current_sign_in_at' - ruby-on-rails

Question

I am getting the following error when I try to sign in in my rails app. I used devise for authentication. My error is
NoMethodError in Devise::SessionsController#create
undefined method `current_sign_in_at'
My user model is
models/user.rb
devise :database_authenticatable, :registerable,
:recoverable, :rememberable, :trackable, :validatable, :omniauthable
attr_accessible :admin,:first_name, :last_name, :profile_name, :college_name, :email, :password, :password_confirmation, :remember_me, :provider, :uid
def admin?
end
def self.find_for_facebook_oauth(auth)
where(auth.slice(:provider, :uid)).first_or_initialize.tap do |user|
user.provider = auth.provider
user.uid = auth.uid
user.email = auth.info.email
user.password = Devise.friendly_token[0,20]
#user.name = auth.info.name # assuming the user model has a name
#user.image = auth.info.image # assuming the user model has an image
user.save!
end
end
end
My schema is
db/schema.rb
ActiveRecord::Schema.define(:version => 20140126101946) do
create_table "levels", :force => true do |t|
t.datetime "created_at", :null => false
t.datetime "updated_at", :null => false
end
create_table "users", :force => true do |t|
t.string "first_name"
t.string "last_name"
t.string "profile_name"
t.string "college_name"
t.string "email", :default => "", :null => false
t.string "encrypted_password", :default => "", :null => false
t.string "reset_password_token"
t.datetime "reset_password_sent_at"
t.datetime "remember_created_at"
t.datetime "created_at", :null => false
t.datetime "updated_at", :null => false
t.string "provider"
t.string "uid"
t.boolean "admin", :default => false
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
The code in my devise_create_users.rb is
class DeviseCreateUsers < ActiveRecord::Migration
def change
create_table(:users) do |t|
t.string :first_name
t.string :last_name
t.string :profile_name
t.string :college_name
## Database authenticatable
t.string :email, :null => false, :default => ""
t.string :encrypted_password, :null => false, :default => ""
## Recoverable
t.string :reset_password_token
t.datetime :reset_password_sent_at
## Rememberable
t.datetime :remember_created_at
## Trackable
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
My trackable was commented and I removed the comments and then ran rake db:migrate but nothing happened. Now I cannot remove trackable as I need it. What I need is that somehow I can keep my devise as it is and also add trackable to it in such a way that it gets added to the schema.rb as well.

Answer 1

To add new columns to existing tables, simply updating already run migration is not going to work as the schema is at a later version than your existing migration's version. If you wish to modify the existing migration, you could run a down migration with:
rake db:migrate:down VERSION=20140126101944 # use version of the user migration
Then modify the migration adding the new columns as you've already done, then run up migration using:
rake db:migrate:up VERSION=20140126101944 # use version of the user migration
A better approach is to add a new migration with the change if your application is already in production.
To add the trackable columns to existing users table:
class AddTrackableColumnsToUser < ActiveRecord::Migration
def change
change_table :users do |t|
## Trackable
t.add_column :sign_in_count, :integer, :default => 0
t.add_column :current_sign_in_at, :datetime
t.add_column :last_sign_in_at, :datetime
t.add_column :current_sign_in_ip, :string
t.add_column :last_sign_in_ip, :string
end
end
end
Then run db:migrate:
rake db:migrate

Answer 2

In your models/user.rb
Change
devise :database_authenticatable, :registerable, :recoverable, :rememberable,
:trackable, :validatable, :omniauthable
to
devise :database_authenticatable, :registerable, :recoverable, :rememberable,
:validatable, :omniauthable
i.e. remove :trackable