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-rw-r--r--activerecord/CHANGELOG.md5
-rw-r--r--activerecord/lib/active_record/associations/has_one_association.rb3
-rw-r--r--activerecord/test/cases/associations/has_one_associations_test.rb2
3 files changed, 9 insertions, 1 deletions
diff --git a/activerecord/CHANGELOG.md b/activerecord/CHANGELOG.md
index 9041f9d33b..3b4681cf4d 100644
--- a/activerecord/CHANGELOG.md
+++ b/activerecord/CHANGELOG.md
@@ -1,3 +1,8 @@
+* Setting a has_one association on a new record no longer causes an empty
+ transaction.
+
+ *Dylan Thacker-Smith*
+
* Re-use `order` argument pre-processing for `reorder`.
*Paul Nikitochkin*
diff --git a/activerecord/lib/active_record/associations/has_one_association.rb b/activerecord/lib/active_record/associations/has_one_association.rb
index 3ab1ea1ff4..1dc98ec640 100644
--- a/activerecord/lib/active_record/associations/has_one_association.rb
+++ b/activerecord/lib/active_record/associations/has_one_association.rb
@@ -27,6 +27,7 @@ module ActiveRecord
return self.target if !(target || record)
if (target != record) || record.changed?
+ save &&= owner.persisted?
transaction_if(save) do
remove_target!(options[:dependent]) if target && !target.destroyed?
@@ -34,7 +35,7 @@ module ActiveRecord
set_owner_attributes(record)
set_inverse_instance(record)
- if owner.persisted? && save && !record.save
+ if save && !record.save
nullify_owner_attributes(record)
set_owner_attributes(target) if target
raise RecordNotSaved, "Failed to save the new associated #{reflection.name}."
diff --git a/activerecord/test/cases/associations/has_one_associations_test.rb b/activerecord/test/cases/associations/has_one_associations_test.rb
index 4fdf9a9643..9cd4db8dc9 100644
--- a/activerecord/test/cases/associations/has_one_associations_test.rb
+++ b/activerecord/test/cases/associations/has_one_associations_test.rb
@@ -505,6 +505,8 @@ class HasOneAssociationsTest < ActiveRecord::TestCase
assert_no_queries { company.account = nil }
account = Account.find(2)
assert_queries { company.account = account }
+
+ assert_no_queries { Firm.new.account = account }
end
def test_has_one_assignment_triggers_save_on_change