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

然后这个代码：

notification = Notification.new（{“area”=>“test”，“severity”=>“10”，“message”=>“Test”，“notification_path_id”=> 3}）

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

notification.valid？

真正

notification.errors.full_messages

[]

所以，正如你所看到的 - 通知是有效的并且没有错误。 通知模型上没有验证。 但是，当我保存模型时：

notification.save

假

它不会保存。 这是什么造成的？ 值得注意的是， set_default运行成功，即使模型未保存， resolved属性在尝试保存时也被设置为false。

编辑

下面的完整错误跟踪，在IRB中遵循上述内容时：

notification.save！ ActiveRecord :: RecordNotSaved：ActiveRecord :: RecordNotSaved from /Users/Jonathan/.rvm/gems/ruby-2.1.1@steel_notify/gems/activerecord-4.1.0.rc1/lib/active_record/persistence.rb:125: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 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 save！' from /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/transactions.rb:273:in 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在保存中阻止！' from /Users/Jonathan/.rvm/gems/ruby-2.1.1@steel_notify/gems/activerecord-4.1.0.rc1/lib/active_record/transactions.rb:329: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 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 transaction'from /Users/Jonathan/.rvm/gems/ruby-2.1.1 @ steel_notify / gems / activerecord-4.1.0.rc1 / lib / active_record / transactions.rb：208：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 with_transaction_returning_statu s'from /Users/Jonathan/.rvm/gems/ruby-2.1.1@steel_notify/gems/activerecord-4.1.0.rc1/lib/active_record/transactions.rb:273: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 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 start' from /Users/Jonathan/.rvm/gems/ruby-2.1.1@steel_notify/gems/railties-4.1.0.rc1/lib/rails/commands/console.rb:9:in start'from 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 console'from /Users/Jonathan/.rvm/gems/ruby -2.1.1@steel_notify/gems/railties-4.1.0.rc1/lib/rails/commands/commands_tasks.rb：40：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 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 /Users/Jonathan/.rvm/ gems/ruby-2.1.1@steel_notify/gems/activesupport-4.1.0.rc1/lib/active_support/dependencies.rb：247：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从/Users/Jonathan/.rvm/gems/ruby-2.1.1@steel_notify/gems/activesupport- 4.1.0.rc1 / lib / active_support / dependencies.rb：232：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 /Users/Jonathan/.rvm/gems/ruby-2.1.1@open-support/dependents.rb:247：in'require'from / Users / Jonathan / steel_notify / bin / rails：8：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'from /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 从/ Users / Jonathan / 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 load_dependency' .rvm / gems / ruby​​-2.1.1 @ steel_notify / gems / activesupport-4.1.0.rc1 / lib / active_support / dependencies.rb：241：in load' from /Users/Jonathan/.rvm/rubies/ruby-2.1.1/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:55:in in'from /Users/Jonathan/.rvm/rubies/ruby-2.1.1/lib/ruby/2.1.0/rubygems /core_ext/kernel_require.rb:55:in require'from require' from -e:1:in '

---

在Ruby中，赋值返回正在分配的值。 在你的情况下，你正在设置self.resolved为false 。 当您从before_ *回调中返回完全false ，它将取消保存操作。 你需要在完成任务后返回一些不是false东西。

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