Methods

Included Modules

Instance Public methods

has_secure_password(options = {})

Adds methods to set and authenticate against a BCrypt password. This mechanism requires you to have a password_digest attribute.

The following validations are added automatically:

  • Password must be present on creation

  • Password length should be less than or equal to 72 bytes

  • Confirmation of password (using a password_confirmation attribute)

If password confirmation validation is not needed, simply leave out the value for password_confirmation (i.e. don't provide a form field for it). When this attribute has a nil value, the validation will not be triggered.

For further customizability, it is possible to suppress the default validations by passing validations: false as an argument.

Add bcrypt (~> 3.1.7) to Gemfile to use has_secure_password:

gem 'bcrypt', '~> 3.1.7'

Example using Active Record (which automatically includes ActiveModel::SecurePassword):

# Schema: User(name:string, password_digest:string)
class User < ActiveRecord::Base
  has_secure_password
end

user = User.new(name: 'david', password: '', password_confirmation: 'nomatch')
user.save                                                       # => false, password required
user.password = 'mUc3m00RsqyRe'
user.save                                                       # => false, confirmation doesn't match
user.password_confirmation = 'mUc3m00RsqyRe'
user.save                                                       # => true
user.authenticate('notright')                                   # => false
user.authenticate('mUc3m00RsqyRe')                              # => user
User.find_by(name: 'david').try(:authenticate, 'notright')      # => false
User.find_by(name: 'david').try(:authenticate, 'mUc3m00RsqyRe') # => user
📝 Source code 
# File activemodel/lib/active_model/secure_password.rb, line 55
      def has_secure_password(options = {})
        # Load bcrypt gem only when has_secure_password is used.
        # This is to avoid ActiveModel (and by extension the entire framework)
        # being dependent on a binary library.
        begin
          require "bcrypt"
        rescue LoadError
          $stderr.puts "You don't have bcrypt installed in your application. Please add it to your Gemfile and run bundle install"
          raise
        end

        include InstanceMethodsOnActivation

        if options.fetch(:validations, true)
          include ActiveModel::Validations

          # This ensures the model has a password by checking whether the password_digest
          # is present, so that this works with both new and existing records. However,
          # when there is an error, the message is added to the password attribute instead
          # so that the error message will make sense to the end-user.
          validate do |record|
            record.errors.add(:password, :blank) unless record.password_digest.present?
          end

          validates_length_of :password, maximum: ActiveModel::SecurePassword::MAX_PASSWORD_LENGTH_ALLOWED
          validates_confirmation_of :password, allow_blank: true
        end
      end
🔎 See on GitHub