Rails 4模型是有效的，但不會保存？

Question

我有以下模型：

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 

然後，代碼：

通知= Notification.new（{ 「區域」 >「test」，「severity」=>「10」，「mess年齡 「=>」 測試」， 「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，你可以看到 - 通知是有效的，沒有錯誤。通知模型上沒有驗證。但是，當我保存模型：

notification.save

假

它不會保存。這是什麼造成的？可能值得注意的是，set_default確實成功運行，並且即使該模型未保存，resolved屬性在嘗試保存時也被設置爲false。

編輯

低於完整的錯誤跟蹤，按照IRB以上時：

notification.save！ ActiveRecord :: RecordNotSaved：ActiveRecord :: RecordNotSaved從 /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 保存！'從 /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！'從 /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 交易中的塊'從 /用戶/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：在 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 交易'從 /用戶/Jonathan/.rvm/gems/ruby-2.1。1@steel_notify/gems/activerecord-4.1.0.rc1/lib/active_record/transactions.rb：208： 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 /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'from /Users/Jonathan/.rvm/gems/ruby-2.1.1@steel_notify/gems/activesupport-4.1.0.rc1/lib/active_support /dependencies.rb:247 ： 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'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' from /Users/Jonathan/.rvm/gems/ruby-2.1.1@steel_notify/gems/activesupport-4.1.0.rc1/lib/active_support/dependencies.rb:247:in 要求'從/ Users/Jonathan/steel_notify/bin/rails：8：在<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 加載'從 /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 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： load' from /Users/Jonathan/.rvm/rubies/ruby-2.1.1/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:55:in 要求'from /Users/Jonathan/.rvm/rubies/ruby-2.1.1/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb ：55：在 require' from -e:1:in'

Answer 1

在Ruby，作業返回被分配的值。在你的情況下，你將self.resolved設置爲false。當您從before_ *回調中精確返回false時，它將取消保存操作。完成作業後，您需要返回不是false的內容。