{"id":850,"date":"2014-01-10T22:26:10","date_gmt":"2014-01-10T16:56:10","guid":{"rendered":"http:\/\/www.allerin.com\/blog\/?p=850"},"modified":"2014-01-17T12:38:47","modified_gmt":"2014-01-17T07:08:47","slug":"save-an-object-skipping-callbacks-in-rails-3-application","status":"publish","type":"post","link":"https:\/\/www.allerin.com\/blog\/save-an-object-skipping-callbacks-in-rails-3-application\/","title":{"rendered":"SAVE AN OBJECT SKIPPING CALLBACKS IN RAILS 3 APPLICATION"},"content":{"rendered":"

Many times, we need to skip validation as well as callbacks while saving the object, due to the requirement of a Ruby on Rails application. In Rails 3.x, to skip validation we can use (:validate => false) and to skip callbacks we tend to use ActiveSupport::Callbacks::ClassMethods#skip_callback (http:\/\/apidock.com\/rails\/ActiveSupport\/Callbacks\/ClassMethods\/skip_callback).<\/p>\n

ActiveSupport::Callbacks::ClassMethods#skip_callback<\/p>\n

This method can get us into trouble, as it is not thread-safe. So to skip callbacks, there is no option as (:callbacks => false) or (:skip_callbacks => true) . In order to achieve similar functionality of skipping callbacks following gems\/code snippets are widely referred:<\/p>\n

    \n
  1. gem ‘skip_activerecord_callbacks’\u00a0(https:\/\/github.com\/dball\/skip_activerecord_callbacks)<\/li>\n
  2. Blog:Disabling ActiveModel callbacks\u00a0(http:\/\/jeffkreeftmeijer.com\/2010\/disabling-activemodel-callbacks\/)<\/li>\n
  3. Activate\/deactivate callbacks snippet\u00a0(https:\/\/gist.github.com\/Tei\/670283)<\/li>\n
  4. Providing (:callbacks => false) option\u00a0(https:\/\/github.com\/rails\/rails\/pull\/4885,\u00a0Commit: https:\/\/github.com\/patrick99e99\/rails\/commit\/d7787d7220a8935d5ee3765824ef0c138b51a4f5)<\/li>\n
  5. gem ‘sneaky-save’\u00a0(https:\/\/github.com\/partyearth\/sneaky-save)<\/li>\n<\/ol>\n

    Since I have been working with Rails for quite some time now, and been observing this situation quite frequently. Based on my observations, I tend to conclude the following on above references and methods,<\/p>\n

      \n
    1. gem ‘skip_activerecord_callbacks’ : Class Methods are provided which functions similar to *_without_callbacks methods(form Rails 2.x)<\/li>\n
    2. Blog:Disabling ActiveModel callbacks : Method given sets skipped callbacks after the necessary work is done but again this is using skip_callback method<\/li>\n
    3. Activate\/deactivate callbacks snippet : These are also class methods which are removing callbacks definitions<\/li>\n
    4. Providing (:callbacks => false) option : This a decent option and also provides same format as (:validate => false) but due to a large number of changes in core rails part it is very difficult to use in application.<\/li>\n
    5. gem ‘sneaky-save’ : This is quite a simple solution. It generates raw SQL query to save the record. Hence, no callbacks or validations are triggered. Out of above mentioned references gem ‘sneaky-save’ found to be meeting the requirement of the Ruby on Rails Application. This gem skips all validation as well as all callbacks.<\/li>\n<\/ol>\n

      INSTALLATION<\/p>\n

      $ gem install sneaky-save<\/pre>\n
      Now add it to your Gemfile with:<\/p>\n
      gem 'sneaky-save'<\/pre>\n
      Run the bundle command to install it.<\/p>\n
      Once you install sneaky-save and add it to your Gemfile, you are ready to use it in your application.<\/p>\n
      USAGE<\/p>\n
      # Create\r\n\r\n@user = User.new\r\n@user.first_name = 'UserFirstName'\r\n@user.last_name = 'UserLastName'\r\n@user.sneaky_save\r\n\r\n# Update\r\n\r\n@user = User.find(123) # say record id = 123 \r\n@user.first_name = 'NewUserFirstName'\r\n@user.last_name = 'NewUserLastName'\r\n@user.sneaky_save<\/pre>\n
      LOGIC<\/p>\n
      All the logic is in SneakySave module (https:\/\/github.com\/partyearth\/sneaky-save\/blob\/master\/lib\/sneaky-save.rb)<\/p>\n
      def sneaky_save\r\n  begin\r\n    # If it is a new record then create a new record else update changed attributes\r\n    new_record? ? sneaky_create : sneaky_update\r\n  rescue ActiveRecord::StatementInvalid\r\n    false\r\n  end\r\nend<\/pre>\n
      We can use sneaky_save on new or existing object. Depending on the object, if it is a new object then to create object sneaky_create is used to generate SQL insert query. If the object is an existing object then SQL update query is generated.<\/p>\n
      # File https:\/\/github.com\/partyearth\/sneaky-save\/blob\/master\/lib\/sneaky-save.rb, line 26<\/p>\n
      def sneaky_create\r\n\r\n  if self.id.nil? && connection.prefetch_primary_key?(self.class.table_name) \r\n    self.id = connection.next_sequence_value(self.class.sequence_name) \r\n  end\r\n\r\n  attributes_values = send :arel_attributes_values\r\n\r\n  # Remove the id field for databases like Postgres which will raise an error on id being NULL \r\n  if self.id.nil? && !connection.prefetch_primary_key?(self.class.table_name) \r\n    attributes_values.reject! { |key,_| key.name == 'id' }\r\n  end\r\n\r\n  # Uses ActiveRecord's insert() method to generate insert SQL query \r\n  new_id = if attributes_values.empty?\r\n    self.class.unscoped.insert connection.empty_insert_statement_value \r\n  else\r\n    self.class.unscoped.insert attributes_values\r\n  end\r\n\r\n  @new_record = false\r\n  !!(self.id ||= new_id)\r\n\r\nend<\/pre>\n
      Here the main functioning is done by Model.insert(). It is ActiveRecord::ConnectionAdapters::DatabaseStatements#insert method that generates SQL insert query for creating a new record.<\/p>\n
      # File https:\/\/github.com\/partyearth\/sneaky-save\/blob\/master\/lib\/sneaky-save.rb, line 50<\/p>\n
      def sneaky_update\r\n  # Handle no changes.\r\n  return true if changes.empty?\r\n  # Here we have changes --> save them.\r\n  pk = self.class.primary_key\r\n  original_id = changed_attributes.has_key?(pk) ? changes[pk].first : send(pk) \r\n  !self.class.update_all(attributes, pk => original_id).zero?\r\nend<\/pre>\n
      Here Model.update_all() is called for generating SQL update query and update the given record. These methods are called from ActiveRecord::Base#update_all<\/p>\n
      HOW IT WORKS?<\/p>\n
      ‘sneaky_save’ method internally calls ‘sneaky_create’ and ‘sneaky_update’ as per object state. In ‘sneaky_create’ method, INSERT SQL query is generated and executed. Direct INSERT SQL is executed without involving Model, thus no validation or callback is triggered. In ‘sneaky_update’ method, UPDATE SQL query are generated and executed to manipulate database. Here it does not instantiate Model object, hence does not trigger any validation or callback.<\/p>\n
      ADVANTAGE<\/p>\n
      Following existing methods which are available for an update but with their own limitations.<\/p>\n
      update_attributes : Validation is invoked. Callbacks are invoked.<\/p>\n
      update_attribute : Validation is skipped. Callbacks are invoked.<\/p>\n
      update_column : Validation is skipped. Callbacks are skipped.<\/p>\n
      update_columns : Validation is skipped. Callbacks are skipped. (available in Rails4)<\/p>\n
      update_all : Validation is skipped. Callbacks are skipped.<\/p>\n
      sneaky_save: sneaky-save is easy to use and have clean syntax. It can be called directly on the object without passing any parameters to it.<\/p>\n
      DRAWBACKS: Does not reload updated record by default. Does not save associated collections. Saves only belongs_to relations. All the callbacks are skipped, does not have any option to trigger\/skip selected callbacks<\/p>\n
      These are mostly my observations so pros and cons may not be limited to what I have posted above \ud83d\ude42 . I am willing to learn the feedback of other community guys, ————————-<\/p>\n","protected":false},"excerpt":{"rendered":"
      In a Ruby on Rails application, we need to skip validation as well as callbacks while saving the object.
      \nIn Rails 3.x, commonly used method to skip callbacks is ActiveSupport’s skip_callback method, but this method could cause problems as its not thread-safe. This post talks about alternative way to achieve the purpose.<\/p>\n","protected":false},"author":9192191,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[3],"tags":[14,20,98],"class_list":["post-850","post","type-post","status-publish","format-standard","hentry","category-technology","tag-rails-3","tag-ruby-on-rails","tag-skip-callback"],"yoast_head":"\nSave an object skipping callbacks in Rails<\/title>\n<meta name=\"description\" content=\"Advanced methods of saving an object in Rails 3 applications without using skip_callback\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.allerin.com\/blog\/save-an-object-skipping-callbacks-in-rails-3-application\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"SAVE AN OBJECT SKIPPING CALLBACKS IN RAILS 3 APPLICATION\" \/>\n<meta property=\"og:description\" content=\"In a Ruby on Rails application, we need to skip validation as well as callbacks while saving the object.  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