Added :touch option to belongs_to associations that will touch the parent record when the current record is saved or destroyed [DHH]

3 files changed, 49 insertions, 2 deletions

diff --git a/activerecord/test/cases/timestamp_test.rb b/activerecord/test/cases/timestamp_test.rb
index e5f8fb9c1d..24b237a72b 100644
--- a/activerecord/test/cases/timestamp_test.rb
+++ b/activerecord/test/cases/timestamp_test.rb
@@ -1,8 +1,10 @@
 require 'cases/helper'
 require 'models/developer'
+require 'models/owner'
+require 'models/pet'
 
 class TimestampTest < ActiveRecord::TestCase
-  fixtures :developers
+  fixtures :developers, :owners, :pets
 
   def setup
     @developer = Developer.first
@@ -27,4 +29,47 @@ class TimestampTest < ActiveRecord::TestCase
     
     assert @previously_updated_at != @developer.updated_at
   end
+  
+  def test_touching_a_different_attribute
+    previously_created_at = @developer.created_at
+    @developer.touch(:created_at)
+
+    assert previously_created_at != @developer.created_at
+  end
+  
+  def test_saving_a_record_with_a_belongs_to_that_specifies_touching_the_parent_should_update_the_parent_updated_at
+    pet   = Pet.first
+    owner = pet.owner
+    previously_owner_updated_at = owner.updated_at
+    
+    pet.name = "Fluffy the Third"
+    pet.save
+    
+    assert previously_owner_updated_at != pet.owner.updated_at
+  end
+
+  def test_destroying_a_record_with_a_belongs_to_that_specifies_touching_the_parent_should_update_the_parent_updated_at
+    pet   = Pet.first
+    owner = pet.owner
+    previously_owner_updated_at = owner.updated_at
+    
+    pet.destroy
+    
+    assert previously_owner_updated_at != pet.owner.updated_at
+  end
+  
+  def test_saving_a_record_with_a_belongs_to_that_specifies_touching_a_specific_attribute_the_parent_should_update_that_attribute
+    Pet.belongs_to :owner, :touch => :happy_at
+
+    pet   = Pet.first
+    owner = pet.owner
+    previously_owner_happy_at = owner.happy_at
+    
+    pet.name = "Fluffy the Third"
+    pet.save
+    
+    assert previously_owner_happy_at != pet.owner.happy_at
+  ensure
+    Pet.belongs_to :owner, :touch => true
+  end
 end
\ No newline at end of file
diff --git a/activerecord/test/models/pet.rb b/activerecord/test/models/pet.rb
index dc1a3c5e94..a8bf94dd86 100644
--- a/activerecord/test/models/pet.rb
+++ b/activerecord/test/models/pet.rb
@@ -1,5 +1,5 @@
 class Pet < ActiveRecord::Base
   set_primary_key :pet_id
-  belongs_to :owner
+  belongs_to :owner, :touch => true
   has_many :toys
 end
diff --git a/activerecord/test/schema/schema.rb b/activerecord/test/schema/schema.rb
index ea848a2940..5640510c96 100644
--- a/activerecord/test/schema/schema.rb
+++ b/activerecord/test/schema/schema.rb
@@ -281,6 +281,8 @@ ActiveRecord::Schema.define do
 
   create_table :owners, :primary_key => :owner_id ,:force => true do |t|
     t.string :name
+    t.column :updated_at, :datetime
+    t.column :happy_at,   :datetime
   end