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Here is how you have to migrate from restful_authentication to Devise.

You'll need to add two gems in Gemfile:

  gem 'devise'
  gem 'devise-encryptable'

In your model file, add the below lines

  devise :database_authenticatable, :registerable,
         :recoverable, :rememberable, :confirmable, :validatable, 
         :encryptable, :encryptor => :restful_authentication_sha1

Modules :encryptable and :encryptor => :restful_authentication_sha1 are important here. Other modules are optional as per your app's business logic.

In config/initializers/devise.rb, configure as below

  config.stretches = 1

  config.pepper = ""

We are setting empty pepper and stretches to 1. This is how restful authentication works. It does not use stretches or pepper (by default).

( Note: You may find REST_AUTH_SITE_KEY in config/initializers/site_keys.rb )

In other case if You did set the REST_AUTH_SITE_KEY , then configure as below

  config.stretches = 10

  config.pepper = "<YOUR_REST_AUTH_SITE_KEY>"

That is it for configuration. Now we have to change the table column names (without deleting them) to give devise what it wants. Here is the migration file I used. Change it according to your app's business logic.

class ConvertRaToDevise < ActiveRecord::Migration
  def self.up

    #encrypting passwords and authentication related fields
    rename_column :accounts, "crypted_password", "encrypted_password"
    change_column :accounts, "encrypted_password", :string, :limit => 128, :default => "", :null => false
    rename_column :accounts, "salt", "password_salt"
    change_column :accounts, "password_salt", :string, :default => "", :null => false

    #confirmation related fields
    rename_column :accounts, "activation_code", "confirmation_token"
    rename_column :accounts, "activated_at", "confirmed_at"
    change_column :accounts, "confirmation_token", :string
    add_column    :accounts, "confirmation_sent_at", :datetime

    #reset password related fields
    rename_column :accounts, "password_reset_code", "reset_password_token"

    #rememberme related fields
    add_column :accounts, "remember_created_at", :datetime #additional field required for devise.

  end

  def self.down

    #rememberme related fields
    remove_column :accounts, "remember_created_at"

    #reset password related fields
    rename_column :accounts, "reset_password_token", "password_reset_code"

    #confirmation related fields
    rename_column :accounts, "confirmation_token", "activation_code"
    rename_column :accounts, "confirmed_at", "activated_at"
    change_column :accounts, "activation_code", :string
    remove_column :accounts, "confirmation_sent_at"

    #encrypting passwords and authentication related fields
    rename_column :accounts, "encrypted_password", "crypted_password"
    change_column :accounts, "crypted_password", :string, :limit => 40
    rename_column :accounts, "password_salt", "salt" 
    change_column :accounts, "salt", :string, :limit => 40

  end
end

Migrate the database using the above migration file and you are done with restful_authentication to devise migration.

Restart your server to get the config changes take effect.

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