Fix Error for Array-Based Composite Keys in nested_attribute

lib/composite_primary_keys/nested_attributes.rb

@@ -61,12 +61,12 @@ def assign_nested_attributes_for_collection_association(association_name, attrib
           unless reject_new_record?(association_name, attributes)
             association.reader.build(attributes.except(*UNASSIGNABLE_KEYS))
           end
-        elsif existing_record = existing_records.detect { |record| record.id.to_s == attributes["id"].to_s }
+        elsif existing_record = cpk_detect_record(attributes['id'], existing_records)
           unless call_reject_if(association_name, attributes)
             # Make sure we are operating on the actual object which is in the association's
             # proxy_target array (either by finding it, or adding it if not found)
             # Take into account that the proxy_target may have changed due to callbacks
-            target_record = association.target.detect { |record| record.id.to_s == attributes["id"].to_s }
+            target_record = cpk_detect_record(attributes['id'], association.target)
             if target_record
               existing_record = target_record
             else

test/test_nested_attributes.rb

@@ -64,4 +64,27 @@ def test_nested_atttribute_update_3
     assert_equal(reference_code.code_label, 'XX')
     assert_equal(reference_code.abbreviation, 'Xx')
   end
+
+  def test_nested_atttribute_update_4
+    code_id = 1003
+
+    reference_type = reference_types(:name_prefix)
+    reference_type.update :reference_codes_attributes => [{
+      :reference_code => code_id,
+      :code_label => 'XX',
+      :abbreviation => 'Xx'
+    }]
+    assert_not_nil ReferenceCode.find_by_reference_code(code_id)
+    reference_code = ReferenceCode.find_by_reference_code(code_id)
+    # directly pass :id as a array 
+    reference_type.update :reference_codes_attributes => [{
+      :id => [reference_type.reference_type_id, code_id],
+      :code_label => 'AAA',
+      :abbreviation => 'Aaa'
+    }]
+
+    reference_code = ReferenceCode.find_by_reference_code(code_id)
+    assert_kind_of(ReferenceCode, reference_code)
+    assert_equal(reference_code.code_label, 'AAA')
+  end
 end