Secure Passwords With Rails And Bcrypt

If you are using bcrypt (at least version 3.1.7), then you can easily add secure password functionality to an ActiveRecord model. First, ensure that the table backing the model has a password_digest column. Then add has_secure_password to your model.

class User < ActiveRecord::Base
  has_secure_password

  # other logic ...
end

You can now instantiate a User instance with any required fields as well as password and password_confirmation. As long as password and password_confirmation match then an encrypted password_digest will be created and stored. You can later check a given password for the user using the authenticate method.

user = User.find_by(email: user_params[:email])

if user.authenticate(user_params[:password])
  puts 'That is the correct password!'
else
  puts 'That password did not match!'
end