Adds touch option to has_one association

1 files changed, 34 insertions, 2 deletions

diff --git a/activerecord/lib/active_record/associations/builder/has_one.rb b/activerecord/lib/active_record/associations/builder/has_one.rb
index a17cfcb805..27ebe8cb71 100644
--- a/activerecord/lib/active_record/associations/builder/has_one.rb
+++ b/activerecord/lib/active_record/associations/builder/has_one.rb
@@ -7,7 +7,7 @@ module ActiveRecord::Associations::Builder # :nodoc:
     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 @@ module ActiveRecord::Associations::Builder # :nodoc:
       [: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 @@ module ActiveRecord::Associations::Builder # :nodoc:
       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