has_secure_password

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