通知

Question

我有以下型号：

通知

class Notification < ActiveRecord::Base
  belongs_to :notification_path
  before_save :set_default

  def set_default
      self.resolved = false unless self.resolved
  end
end

notification_path

class NotificationPath < ActiveRecord::Base
  has_many :notifications
end

然后这段代码：

notification = Notification.new（{＆＃34; area＆＃34; =＆gt;＆＃34; test＆＃34;，＆＃34; severity＆＃34; =＆gt;＆＃34; 10＆＃34;，＆＃34;消息＆＃34; =＆gt;＆＃34;测试＆＃34;，＆＃34; notification_path_id＆＃34; =＆gt; 3}）

 <Notification id: nil, area: "test", severity:
 10, message: "Test", created_at: nil, updated_at: nil,
 notification_path_id: 3, resolved: nil>

notification.valid？

真

notification.errors.full_messages

[]

因此，正如您所看到的 - 通知有效并且没有错误。通知模型上的验证为零。但是，当我保存模型时：

notification.save

假

它不会拯救。是什么造成的？值得注意的是set_default确实成功运行，即使模型没有保存，{I}}属性在尝试保存时也会设置为false。

修改

以下完整错误跟踪，在IRB中执行以上操作时：

notification.save！ ActiveRecord :: RecordNotSaved：ActiveRecord :: RecordNotSaved来自       /Users/Jonathan/.rvm/gems/ruby-2.1.1@steel_notify/gems/activerecord-4.1.0.rc1/lib/active_record/persistence.rb:125:in       resolved保存＆＃39！;从       /Users/Jonathan/.rvm/gems/ruby-2.1.1@steel_notify/gems/activerecord-4.1.0.rc1/lib/active_record/attribute_methods/dirty.rb:29:in       save!' from /Users/Jonathan/.rvm/gems/ruby-2.1.1@steel_notify/gems/activerecord-4.1.0.rc1/lib/active_record/validations.rb:57:in阻止保存！＆＃39;从       /Users/Jonathan/.rvm/gems/ruby-2.1.1@steel_notify/gems/activerecord-4.1.0.rc1/lib/active_record/transactions.rb:329:in       交易中save!' from /Users/Jonathan/.rvm/gems/ruby-2.1.1@steel_notify/gems/activerecord-4.1.0.rc1/lib/active_record/transactions.rb:273:in阻止＆＃39;从       /Users/Jonathan/.rvm/gems/ruby-2.1.1@steel_notify/gems/activerecord-4.1.0.rc1/lib/active_record/connection_adapters/abstract/database_statements.rb:219:in       block in with_transaction_returning_status' from /Users/Jonathan/.rvm/gems/ruby-2.1.1@steel_notify/gems/activerecord-4.1.0.rc1/lib/active_record/connection_adapters/abstract/database_statements.rb:211:in交易＆＃39;从       /Users/Jonathan/.rvm/gems/ruby-2.1.1@steel_notify/gems/activerecord-4.1.0.rc1/lib/active_record/transactions.rb:208:in       within_new_transaction' from /Users/Jonathan/.rvm/gems/ruby-2.1.1@steel_notify/gems/activerecord-4.1.0.rc1/lib/active_record/connection_adapters/abstract/database_statements.rb:211:in with_transaction_returning_status＆＃39;从       /Users/Jonathan/.rvm/gems/ruby-2.1.1@steel_notify/gems/activerecord-4.1.0.rc1/lib/active_record/transactions.rb:273:in       transaction' from /Users/Jonathan/.rvm/gems/ruby-2.1.1@steel_notify/gems/activerecord-4.1.0.rc1/lib/active_record/transactions.rb:326:in开始＆＃39;从       /Users/Jonathan/.rvm/gems/ruby-2.1.1@steel_notify/gems/railties-4.1.0.rc1/lib/rails/commands/console.rb:9:in       save!' from (irb):23 from /Users/Jonathan/.rvm/gems/ruby-2.1.1@steel_notify/gems/railties-4.1.0.rc1/lib/rails/commands/console.rb:90:in控制台＆＃39;从       /Users/Jonathan/.rvm/gems/ruby-2.1.1@steel_notify/gems/railties-4.1.0.rc1/lib/rails/commands/commands_tasks.rb:40:in       start' from /Users/Jonathan/.rvm/gems/ruby-2.1.1@steel_notify/gems/railties-4.1.0.rc1/lib/rails/commands/commands_tasks.rb:69:in＆＃39;从       /Users/Jonathan/.rvm/gems/ruby-2.1.1@steel_notify/gems/activesupport-4.1.0.rc1/lib/active_support/dependencies.rb:247:in       run_command!' from /Users/Jonathan/.rvm/gems/ruby-2.1.1@steel_notify/gems/railties-4.1.0.rc1/lib/rails/commands.rb:17:in阻止了要求＆＃39;从       /Users/Jonathan/.rvm/gems/ruby-2.1.1@steel_notify/gems/activesupport-4.1.0.rc1/lib/active_support/dependencies.rb:232:in       require' from /Users/Jonathan/.rvm/gems/ruby-2.1.1@steel_notify/gems/activesupport-4.1.0.rc1/lib/active_support/dependencies.rb:247:in需要＆＃39; from / Users / Jonathan / steel_notify / bin / rails：8：in load_dependency' from /Users/Jonathan/.rvm/gems/ruby-2.1.1@steel_notify/gems/activesupport-4.1.0.rc1/lib/active_support/dependencies.rb:247:in load＆＃39;从       /Users/Jonathan/.rvm/gems/ruby-2.1.1@steel_notify/gems/activesupport-4.1.0.rc1/lib/active_support/dependencies.rb:241:in       <top (required)>' from /Users/Jonathan/.rvm/gems/ruby-2.1.1@steel_notify/gems/activesupport-4.1.0.rc1/lib/active_support/dependencies.rb:241:in load_dependency＆＃39;从       /Users/Jonathan/.rvm/gems/ruby-2.1.1@steel_notify/gems/activesupport-4.1.0.rc1/lib/active_support/dependencies.rb:241:in       block in load' from /Users/Jonathan/.rvm/gems/ruby-2.1.1@steel_notify/gems/activesupport-4.1.0.rc1/lib/active_support/dependencies.rb:232:in需要＆＃39;从       /Users/Jonathan/.rvm/rubies/ruby-2.1.1/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:55:in       load' from /Users/Jonathan/.rvm/rubies/ruby-2.1.1/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:55:in＆＃39;

Answer 1

在Ruby中，赋值返回指定的值。在您的情况下，您将self.resolved设置为false。当您从before_ *回调中准确返回false时，它将取消保存操作。在完成作业后，您需要返回不是false的内容。

Rails 4模型有效，但不会保存？

通知

notification_path

修改

1 个答案: