In nested_attributes when association is not loaded and association record is...

In nested_attributes when association is not loaded and association record is saved then in memory record attributes should be saved

[#5053 state:resolved]
Signed-off-by: NJosé Valim <jose.valim@gmail.com>

activerecord/lib/active_record/associations/association_collection.rb

@@ -352,11 +352,12 @@ def load_target
                 if @target.is_a?(Array) && @target.any?
                   @target = find_target.map do |f|
                     i = @target.index(f)
-                    t = @target.delete_at(i) if i
-                    if t && t.changed?
-                      t
+                    if i
+                      @target.delete_at(i).tap do |t|
+                        keys = ["id"] + t.changes.keys + (f.attribute_names - t.attribute_names)
+                        t.attributes = f.attributes.except(*keys)
+                      end
                     else
-                      f.mark_for_destruction if t && t.marked_for_destruction?
                       f
                     end
                   end + @target
@@ -432,7 +433,14 @@ def add_record_to_target_with_callbacks(record)
           callback(:before_add, record)
           yield(record) if block_given?
           @target ||= [] unless loaded?
-          @target << record unless @reflection.options[:uniq] && @target.include?(record)
+          index = @target.index(record)
+          unless @reflection.options[:uniq] && index
+            if index
+              @target[index] = record
+            else
+             @target << record
+            end
+          end 
           callback(:after_add, record)
           set_inverse_instance(record, @owner)
           record

activerecord/test/cases/associations_test.rb

@@ -18,6 +18,8 @@
 require 'models/reader'
 require 'models/parrot'
 require 'models/pirate'
+require 'models/ship'
+require 'models/ship_part'
 require 'models/treasure'
 require 'models/price_estimate'
 require 'models/club'
@@ -29,6 +31,23 @@ class AssociationsTest < ActiveRecord::TestCase
   fixtures :accounts, :companies, :developers, :projects, :developers_projects,
            :computers, :people, :readers
 
+  def test_loading_the_association_target_should_keep_child_records_marked_for_destruction
+    ship = Ship.create!(:name => "The good ship Dollypop")
+    part = ship.parts.create!(:name => "Mast")
+    part.mark_for_destruction
+    ship.parts.send(:load_target)
+    assert ship.parts[0].marked_for_destruction?
+  end
+
+  def test_loading_the_association_target_should_load_most_recent_attributes_for_child_records_marked_for_destruction
+    ship = Ship.create!(:name => "The good ship Dollypop")
+    part = ship.parts.create!(:name => "Mast")
+    part.mark_for_destruction
+    ShipPart.find(part.id).update_attribute(:name, 'Deck')
+    ship.parts.send(:load_target)
+    assert_equal 'Deck', ship.parts[0].name
+  end
+
   def test_include_with_order_works
     assert_nothing_raised {Account.find(:first, :order => 'id', :include => :firm)}
     assert_nothing_raised {Account.find(:first, :order => :id, :include => :firm)}

activerecord/test/cases/nested_attributes_test.rb

@@ -810,7 +810,13 @@ def setup
     @part = @ship.parts.create!(:name => "Mast")
     @trinket = @part.trinkets.create!(:name => "Necklace")
   end
-  
+
+  test "if association is not loaded and association record is saved and then in memory record attributes should be saved" do
+    @ship.parts_attributes=[{:id => @part.id,:name =>'Deck'}]
+    assert_equal 1, @ship.parts.proxy_target.size
+    assert_equal 'Deck', @ship.parts[0].name
+  end  
+
   test "when grandchild changed in memory, saving parent should save grandchild" do
     @trinket.name = "changed"
     @ship.save