无法在 rails 的控制台中为每个用户调用 before_save 回调

Question

我正在 Rails 上关注 Ruby 上的 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住令牌。为此，我在控制台中使用以下代码：

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

因为我有：

before save :create remember token

在 app/models/user.rb 中，这应该创建一个记忆标记，但我在运行上收到以下错误：

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'

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

Answer 1

在 app/models/user.rb 中，更改为：

def create_remember_token 
  self.remember_token = SecureRandom.urlsafe base64 
end

对此：

def create_remember_token 
  self.remember_token = SecureRandom.urlsafe_base64 
end

您在 urlsafe_base54

中缺少下划线 (_)

来源：http://ruby-doc.org/stdlib-2.2.2/libdoc/securerandom/rdoc/SecureRandom.html#method-c-urlsafe_base64

无法在 rails 的控制台中为每个用户调用 before_save 回调

Unable to invoke the before_save callback for each user in console in rails

ruby

ruby-on-rails

ruby-on-rails-3

ruby-on-rails-3.2

ruby-on-rails-4