module ActiveModel::SecurePassword::InstanceMethodsOnActivation

user.authenticate('mUc3m00RsqyRe') # => user
user.authenticate('notright') # => false
user.save
user = User.new(name: 'david', password: 'mUc3m00RsqyRe')

end
has_secure_password validations: false
class User < ActiveRecord::Base

Returns +self+ if the password is correct, otherwise +false+.

def authenticate(unencrypted_password)
  BCrypt::Password.new(password_digest).is_password?(unencrypted_password) && self
end