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-rw-r--r--activerecord/lib/active_record/attribute.rb4
-rw-r--r--activerecord/test/cases/dirty_test.rb7
2 files changed, 11 insertions, 0 deletions
diff --git a/activerecord/lib/active_record/attribute.rb b/activerecord/lib/active_record/attribute.rb
index 38281158d8..5b4e967e94 100644
--- a/activerecord/lib/active_record/attribute.rb
+++ b/activerecord/lib/active_record/attribute.rb
@@ -231,6 +231,10 @@ module ActiveRecord
false
end
+ def forgetting_assignment
+ dup
+ end
+
def with_type(type)
self.class.new(name, type)
end
diff --git a/activerecord/test/cases/dirty_test.rb b/activerecord/test/cases/dirty_test.rb
index 721861975a..1fc78f8d32 100644
--- a/activerecord/test/cases/dirty_test.rb
+++ b/activerecord/test/cases/dirty_test.rb
@@ -775,6 +775,13 @@ class DirtyTest < ActiveRecord::TestCase
assert person.changed?
end
+ test "attributes not selected are still missing after save" do
+ person = Person.select(:id).first
+ assert_raises(ActiveModel::MissingAttributeError) { person.first_name }
+ assert person.save # calls forget_attribute_assignments
+ assert_raises(ActiveModel::MissingAttributeError) { person.first_name }
+ end
+
test "saved_change_to_attribute? returns whether a change occurred in the last save" do
person = Person.create!(first_name: "Sean")