Follow all steps properly mentioned in below link:
https://github.com/plataformatec/devise/wiki/How-To:-Add-:confirmable-to-Users
Modifying the User Model
First, add devise :confirmable
to your models/user.rb
file
Create a New Migration
Then, do the migration as:
rails g migration add_confirmable_to_devise
Will generate db/migrate/YYYYMMDDxxx_add_confirmable_to_devise.rb.
Add the following to it in order to do the migration.
class AddConfirmableToDevise < ActiveRecord::Migration
# Note: You can't use change, as User.update_all will fail in the down migration
def up
add_column :users, :confirmation_token, :string
add_column :users, :confirmed_at, :datetime
add_column :users, :confirmation_sent_at, :datetime
# add_column :users, :unconfirmed_email, :string # Only if using reconfirmable
add_index :users, :confirmation_token, unique: true
# User.reset_column_information # Need for some types of updates, but not for update_all.
# To avoid a short time window between running the migration and updating all existing
# users as confirmed, do the following
execute("UPDATE users SET confirmed_at = NOW()")
# All existing user accounts should be able to log in after this.
# Remind: Rails using SQLite as default. And SQLite has no such function :NOW.
# Use :date('now') instead of :NOW when using SQLite.
# => execute("UPDATE users SET confirmed_at = date('now')")
# Or => User.all.update_all confirmed_at: Time.now
end
def down
remove_columns :users, :confirmation_token, :confirmed_at, :confirmation_sent_at
# remove_columns :users, :unconfirmed_email # Only if using reconfirmable
end
end
You can also generate the corresponding Devise views if they have not yet been created:
rails generate devise:views users
Do the migration rake db:migrate
Restart the server.