Rails 4模型有效,但不会保存？

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({"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

[]

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

notification.save

假

它不会保存.是什么造成的？可能值得注意的是,set_default运行成功,即使模型未保存,该resolved属性在尝试保存时也会设置为false.

编辑

下面的完整错误跟踪,在IRB中遵循以上内容时:

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 !来自/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 block in save!' 来自/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 block in the 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: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_status'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 start from 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 /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'来自/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 block in require' 来自/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 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/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 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 /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 'from /Users/Jonathan/.rvm/gems/ruby-2.1.1@steel_notify/gems/activesupport-4.1.0.rc1/lib/active_support/dependencies.rb:241:in require'from load' from /Users/Jonathan/.rvm/rubies/ruby-2.1.1/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:55:in / Users/Jonathan /. rvm/rubies/ruby​​-2.1.1/lib/ruby​​/2.1.0/ruby​​gems/core_ext/kernel_require.rb:55:in require' from -e:1:in'

Answer 1

在Ruby中,赋值返回分配的值.在你的情况要设置self.resolved到false.当您false从before_*回调中完全返回时,它将取消保存操作.你需要false在完成作业后返回一些不属于你的东西.