Save associated records only if the association is already loaded. Closes #8713.

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@7075 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

activerecord/CHANGELOG

@@ -1,5 +1,7 @@
 *SVN*
 
+* Save associated records only if the association is already loaded.  #8713 [blaine]
+
 * MySQL: fix show_variable.  #8448 [matt, Jeremy Kemper]
 
 * Fixtures: correctly delete and insert fixtures in a single transaction.  #8553 [Michael Schuerig]

activerecord/lib/active_record/associations.rb

@@ -1100,8 +1100,8 @@ module ActiveRecord
 
           after_callback = <<-end_eval
             association = instance_variable_get("@#{association_name}")
-            
-            if association.respond_to?(:loaded?)
+
+            if association.respond_to?(:loaded?) && association.loaded?
               if @new_record_before_save
                 records_to_save = association
               else
@@ -1111,7 +1111,7 @@ module ActiveRecord
               association.send(:construct_sql)   # reconstruct the SQL queries now that we know the owner's id
             end
           end_eval
-                
+
           # Doesn't use after_save as that would save associations added in after_create/after_update twice
           after_create(after_callback)
           after_update(after_callback)

activerecord/test/associations_test.rb

@@ -69,7 +69,7 @@ class AssociationsTest < Test::Unit::TestCase
 end
 
 class AssociationProxyTest < Test::Unit::TestCase
-  fixtures :authors, :posts, :categorizations, :categories
+  fixtures :authors, :posts, :categorizations, :categories, :developers, :projects, :developers_projects
 
   def test_proxy_accessors
     welcome = posts(:welcome)
@@ -98,6 +98,14 @@ class AssociationProxyTest < Test::Unit::TestCase
     assert david.categories.include?(categories(:technology))
   end
 
+  def test_save_on_parent_does_not_load_target
+    david = developers(:david)
+
+    assert !david.projects.loaded?
+    david.update_attribute(:created_at, Time.now)
+    assert !david.projects.loaded?
+  end
+
 end
 
 class HasOneAssociationsTest < Test::Unit::TestCase