If a nested_attribute is being marked for destruction and at the same time an attr_accessor value is being assigned then the value being assigned is being ignored. This patch is a fix for that issue.

[#5939 state:resolved]

Signed-off-by: José Valim <jose.valim@gmail.com>

activerecord/lib/active_record/nested_attributes.rb

@@ -417,11 +417,8 @@ module ActiveRecord
     # Updates a record with the +attributes+ or marks it for destruction if
     # +allow_destroy+ is +true+ and has_destroy_flag? returns +true+.
     def assign_to_or_mark_for_destruction(record, attributes, allow_destroy)
-      if has_destroy_flag?(attributes) && allow_destroy
-        record.mark_for_destruction
-      else
-        record.attributes = attributes.except(*UNASSIGNABLE_KEYS)
-      end
+      record.attributes = attributes.except(*UNASSIGNABLE_KEYS)
+      record.mark_for_destruction if has_destroy_flag?(attributes) && allow_destroy
     end
 
     # Determines if a hash contains a truthy _destroy key.

activerecord/test/cases/nested_attributes_test.rb

@@ -827,7 +827,7 @@ class TestNestedAttributesWithNonStandardPrimaryKeys < ActiveRecord::TestCase
   fixtures :owners, :pets
 
   def setup
-    Owner.accepts_nested_attributes_for :pets
+    Owner.accepts_nested_attributes_for :pets, :allow_destroy => true
 
     @owner = owners(:ashley)
     @pet1, @pet2 = pets(:chew), pets(:mochi)
@@ -844,6 +844,19 @@ class TestNestedAttributesWithNonStandardPrimaryKeys < ActiveRecord::TestCase
     @owner.update_attributes(@params)
     assert_equal ['Foo', 'Bar'], @owner.pets.map(&:name)
   end
+
+  def test_attr_accessor_of_child_should_be_value_provided_during_update_attributes
+    @owner = owners(:ashley)
+    @pet1 = pets(:chew)
+    assert_equal nil, $current_user
+    attributes = {:pets_attributes => { "1"=> { :id => @pet1.id,
+                                                :name => "Foo2",
+                                                :current_user => "John",
+                                                :_destroy=>true }}}
+    @owner.update_attributes(attributes)
+    assert_equal 'John', $after_destroy_callback_output
+  end
+
 end
 
 class TestHasOneAutosaveAssociationWhichItselfHasAutosaveAssociations < ActiveRecord::TestCase

activerecord/test/models/pet.rb

@@ -1,5 +1,13 @@
 class Pet < ActiveRecord::Base
+
+  attr_accessor :current_user
+
   set_primary_key :pet_id
   belongs_to :owner, :touch => true
   has_many :toys
+
+  after_destroy do |record|
+    $after_destroy_callback_output = record.current_user
+  end
+
 end