Adds touch option to has_one association

activerecord/CHANGELOG.md

+*   Add `touch` option to `has_one` association.
+
+    *Abhay Nikam*
+
 *   Deprecate `where.not` working as NOR and will be changed to NAND in Rails 6.1.
 
     ```ruby

activerecord/lib/active_record/associations/builder/has_one.rb

@@ -7,7 +7,7 @@ def self.macro
     end
 
     def self.valid_options(options)
-      valid = super + [:as]
+      valid = super + [:as, :touch]
       valid += [:through, :source, :source_type] if options[:through]
       valid
     end
@@ -16,6 +16,11 @@ def self.valid_dependent_options
       [:destroy, :delete, :nullify, :restrict_with_error, :restrict_with_exception]
     end
 
+    def self.define_callbacks(model, reflection)
+      super
+      add_touch_callbacks(model, reflection) if reflection.options[:touch]
+    end
+
     def self.add_destroy_callbacks(model, reflection)
       super unless reflection.options[:through]
     end
@@ -27,6 +32,33 @@ def self.define_validations(model, reflection)
       end
     end
 
-    private_class_method :macro, :valid_options, :valid_dependent_options, :add_destroy_callbacks, :define_validations
+    def self.touch_record(o, name, touch)
+      record = o.send name
+
+      return unless record && record.persisted?
+
+      if touch != true
+        record.touch(touch)
+      else
+        record.touch
+      end
+    end
+
+    def self.add_touch_callbacks(model, reflection)
+      name  = reflection.name
+      touch = reflection.options[:touch]
+
+      callback = lambda { |record|
+        HasOne.touch_record(record, name, touch)
+      }
+
+      model.after_create callback, if: :saved_changes?
+      model.after_update callback, if: :saved_changes?
+      model.after_destroy callback
+      model.after_touch callback
+    end
+
+    private_class_method :macro, :valid_options, :valid_dependent_options, :add_destroy_callbacks,
+      :define_callbacks, :define_validations, :add_touch_callbacks
   end
 end

activerecord/test/cases/associations/has_one_associations_test.rb

@@ -15,10 +15,13 @@
 require "models/drink_designer"
 require "models/chef"
 require "models/department"
+require "models/club"
+require "models/membership"
 
 class HasOneAssociationsTest < ActiveRecord::TestCase
   self.use_transactional_tests = false unless supports_savepoints?
-  fixtures :accounts, :companies, :developers, :projects, :developers_projects, :ships, :pirates, :authors, :author_addresses
+  fixtures :accounts, :companies, :developers, :projects, :developers_projects,
+           :ships, :pirates, :authors, :author_addresses, :memberships, :clubs
 
   def setup
     Account.destroyed_account_ids.clear
@@ -706,6 +709,40 @@ def test_with_polymorphic_has_one_with_custom_columns_name
     end
   end
 
+  def test_has_one_with_touch_option_on_create
+    assert_queries(3) {
+      Club.create(name: "1000 Oaks", membership_attributes: { favourite: true })
+    }
+  end
+
+  def test_has_one_with_touch_option_on_update
+    new_club = Club.create(name: "1000 Oaks")
+    new_club.create_membership
+
+    assert_queries(2) { new_club.update(name: "Effingut") }
+  end
+
+  def test_has_one_with_touch_option_on_touch
+    new_club = Club.create(name: "1000 Oaks")
+    new_club.create_membership
+
+    assert_queries(1) { new_club.touch }
+  end
+
+  def test_has_one_with_touch_option_on_destroy
+    new_club = Club.create(name: "1000 Oaks")
+    new_club.create_membership
+
+    assert_queries(2) { new_club.destroy }
+  end
+
+  def test_has_one_with_touch_option_on_empty_update
+    new_club = Club.create(name: "1000 Oaks")
+    new_club.create_membership
+
+    assert_no_queries { new_club.save }
+  end
+
   class SpecialBook < ActiveRecord::Base
     self.table_name = "books"
     belongs_to :author, class_name: "SpecialAuthor"

activerecord/test/models/club.rb

 # frozen_string_literal: true
 
 class Club < ActiveRecord::Base
-  has_one :membership
+  has_one :membership, touch: true
   has_many :memberships, inverse_of: false
   has_many :members, through: :memberships
   has_one :sponsor
@@ -12,6 +12,8 @@ class Club < ActiveRecord::Base
 
   scope :general, -> { left_joins(:category).where(categories: { name: "General" }).unscope(:limit) }
 
+  accepts_nested_attributes_for :membership
+
   private
 
     def private_method

activerecord/test/schema/schema.rb

@@ -524,6 +524,8 @@
     t.integer :club_id, :member_id
     t.boolean :favourite, default: false
     t.integer :type
+    t.datetime :created_at
+    t.datetime :updated_at
   end
 
   create_table :member_types, force: true do |t|