Question

我正在尝试创建一个只存储散列密码的User类

class User
  # Password should be stored only as hash in @password_hash,
  # crypted by that function:
  def self.crypt(password)
    # Returns password hash
  end

  # Crypt password and store it in @password_hash
  def password=(str)
    @password_hash = crypt(str)
  end

  # Crypt given password and compare it with stored @password_hash
  def password==(str)
    @password_hash == crypt(str)
  end
end

me = User.new
me.password = 'qwerty'

if me.password == 'qwerty'
  puts 'Ok'
else
  puts 'Error'
end

但我在第14行获得syntax error, unexpected tEQ, expecting '\n' or ';'

Answer 1

您无法定义名为password==的方法。作业很特别;比较不是。如果您真的想使用User.password == "something"语法，可以这样做：

class User
  attr_reader :password
  def password=(str)
    @password = Password.new(str)
  end

  class Password < String
    def encrypt(str)
      "foo" + str # TODO make stronger
    end

    def initialize(str)
      super(encrypt(str))
    end

    def ==(other)
      super(encrypt(other))
    end
  end
end

Answer 2

尝试：

def == str
   @password_hash == crypt(str)
end

Comparable模块也是take a look。

在Ruby中使用equals符号定义方法

2 个答案: