Ruby on rails 无法为rails控制台中的每个用户调用before_save回调

我正在学习有关RubyonRails的Michael Haartl教程。在开发登录功能之前创建的用户需要分配一个记忆令牌。为此，我在console中使用以下代码：

User.all.each { |user| user.save(validate: false) }

因为我：

before save :create remember token

在

app/models/user.rb

中，这应该会创建一个记忆令牌，但我在运行此操作时遇到以下错误：

NameError: undefined local variable or method `base64' for     #<User:0x00559aefda7f20>
from /home/shivani/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activemodel-4.2.4/lib/active_model/attribute_methods.rb:433:in `method_missing'
from /home/shivani/myapp/app/models/user.rb:13:in `create_remember_token'
from /home/shivani/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activesupport-4.2.4/lib/active_support/callbacks.rb:432:in `block in make_lambda'
from /home/shivani/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activesupport-4.2.4/lib/active_support/callbacks.rb:164:in `call'
from /home/shivani/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activesupport-4.2.4/lib/active_support/callbacks.rb:164:in `block in halting'
from /home/shivani/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activesupport-4.2.4/lib/active_support/callbacks.rb:504:in `call'
from /home/shivani/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activesupport-4.2.4/lib/active_support/callbacks.rb:504:in `block in call'
from /home/shivani/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activesupport-4.2.4/lib/active_support/callbacks.rb:504:in `each'
from /home/shivani/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activesupport-4.2.4/lib/active_support/callbacks.rb:504:in `call'
from /home/shivani/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activesupport-4.2.4/lib/active_support/callbacks.rb:92:in `__run_callbacks__'
from /home/shivani/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activesupport-4.2.4/lib/active_support/callbacks.rb:778:in `_run_save_callbacks'
from /home/shivani/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/callbacks.rb:302:in `create_or_update'
from /home/shivani/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/persistence.rb:120:in `save'
from /home/shivani/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/validations.rb:37:in `save'
from /home/shivani/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/attribute_methods/dirty.rb:21:in `save'
from /home/shivani/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/transactions.rb:286:in `block (2 levels) in save'
... 14 levels...
from /home/shivani/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/railties-4.2.4/lib/rails/commands/console.rb:9:in `start'
from /home/shivani/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/railties-4.2.4/lib/rails/commands/commands_tasks.rb:68:in `console'
from /home/shivani/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/railties-4.2.4/lib/rails/commands/commands_tasks.rb:39:in `run_command!'
from /home/shivani/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/railties-4.2.4/lib/rails/commands.rb:17:in `<top (required)>'
from /home/shivani/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activesupport-4.2.4/lib/active_support/dependencies.rb:274:in `require'
from /home/shivani/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activesupport-4.2.4/lib/active_support/dependencies.rb:274:in `block in require'
from /home/shivani/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activesupport-4.2.4/lib/active_support/dependencies.rb:240:in `load_dependency'
from /home/shivani/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activesupport-4.2.4/lib/active_support/dependencies.rb:274:in `require'
from /home/shivani/myapp/bin/rails:9:in `<top (required)>'
from /home/shivani/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activesupport-4.2.4/lib/active_support/dependencies.rb:268:in `load'
from /home/shivani/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activesupport-4.2.4/lib/active_support/dependencies.rb:268:in `block in load'
from /home/shivani/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activesupport-4.2.4/lib/active_support/dependencies.rb:240:in `load_dependency'
from /home/shivani/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activesupport-4.2.4/lib/active_support/dependencies.rb:268:in `load'
from /home/shivani/.rbenv/versions/2.2.3/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in `require'
from /home/shivani/.rbenv/versions/2.2.3/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in `require'

NameError:未定义的局部变量或方法'base64'#
来自/home/shivani/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activemodel-4.2.4/lib/active\u model/attribute\u methods.rb:433:在“method\u missing”中
from/home/shivani/myapp/app/models/user.rb:13:in“create\u memory\u token”
from/home/shivani/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activesupport-4.2.4/lib/active\u support/callbacks.rb:432:in'block in make\u lambda'
from/home/shivani/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activesupport-4.2.4/lib/active\u support/callbacks.rb:164:in'call'
from/home/shivani/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activesupport-4.2.4/lib/active\u support/callbacks.rb:164:在“停止中的块”中
from/home/shivani/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activesupport-4.2.4/lib/active\u support/callbacks.rb:504:in'call'
from/home/shivani/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activesupport-4.2.4/lib/active\u support/callbacks.rb:504:in'block in call'
from/home/shivani/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activesupport-4.2.4/lib/active\u support/callbacks.rb:504:在'each'中
from/home/shivani/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activesupport-4.2.4/lib/active\u support/callbacks.rb:504:in'call'
from/home/shivani/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activesupport-4.2.4/lib/active\u support/callbacks.rb:92:在“运行回调”中
来自/home/shivani/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activesupport-4.2.4/lib/active\u support/callbacks.rb:778:在“运行保存\u回调”中
来自/home/shivani/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active\u record/callbacks.rb:302:在“创建或更新”中
from/home/shivani/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active\u record/persistence.rb:120:在“保存”中
from/home/shivani/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active\u record/validations.rb:37:在“保存”中
来自/home/shivani/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active\u record/attribute\u methods/dirty.rb:21:在“保存”中
from/home/shivani/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/transactions.rb:286:在“保存中的块（两个级别）”中
... 14级。。。
来自/home/shivani/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/railties-4.2.4/lib/rails/commands/console.rb:9:在“开始”中
来自/home/shivani/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/railties-4.2.4/lib/rails/commands/commands_tasks.rb:68:在“控制台”中
from/home/shivani/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/railties-4.2.4/lib/rails/commands/commands_tasks.rb:39:in'run_command！'
from/home/shivani/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/railties-4.2.4/lib/rails/commands.rb:17:in`'
来自/home/shivani/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activesupport-4.2.4/lib/active\u support/dependencies.rb:274:in“require”
来自/home/shivani/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activesupport-4.2.4/lib/active\u support/dependencies.rb:274:“请求中的块”
来自/home/shivani/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activesupport-4.2.4/lib/active\u support/dependencies.rb:240:在“加载\u依赖项”中
来自/home/shivani/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activesupport-4.2.4/lib/active\u support/dependencies.rb:274:in“require”
from/home/shivani/myapp/bin/rails:9:in`'
来自/home/shivani/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activesupport-4.2.4/lib/active\u support/dependencies.rb:268:在“加载”中
from/home/shivani/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activesupport-4.2.4/lib/active\u support/dependencies.rb:268:in'block in load'
来自/home/shivani/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activesupport-4.2.4/lib/active\u support/dependencies.rb:240:在“加载\u依赖项”中
来自/home/shivani/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activesupport-4.2.4/lib/active\u support/dependencies.rb:268:在“加载”中
from/home/shivani/.rbenv/versions/2.2.3/lib/ruby/2.2.0/rubygems/core\u ext/kernel\u require.rb:54:in'require'
from/home/shivani/.rbenv/versions/2.2.3/lib/ruby/2.2.0/rubygems/core\u ext/kernel\u require.rb:54:in'require'

请帮忙！ user.rb的内容：

class User < ActiveRecord::Base 
    has_secure_password
    before_save { self.email = email.downcase }
    before_save :create_remember_token
    private
    def create_remember_token
       self.remember_token = SecureRandom.urlsafe Base64
    end
    validates :name, presence: true, length: { maximum: 50 }
    VALID_EMAIL_REGEX = /\A[\w+\-.]+@[a-z\d\-.]+\.[a-z]+\z/i
    validates :email, presence: true, length: { maximum: 255 },
                format: { with: VALID_EMAIL_REGEX },
                uniqueness: { case_sensitive: false }

    validates :password, presence: true, length: { minimum: 6 }
    end

---

class用户

在

app/models/user.rb

中，更改以下内容：

def create_remember_token 
  self.remember_token = SecureRandom.urlsafe base64 
end

为此：

def create_remember_token 
  self.remember_token = SecureRandom.urlsafe_base64 
end

urlsafe\u base54

---

来源：

你能分享你的

app/models/user.rb

文件的内容吗？类用户

---

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