Modifies belong_to touch callback to touch old associations also #9091

1 files changed, 22 insertions, 0 deletions

diff --git a/activerecord/CHANGELOG.md b/activerecord/CHANGELOG.md
index f73fc9d9a3..7dbfad4473 100644
--- a/activerecord/CHANGELOG.md
+++ b/activerecord/CHANGELOG.md
@@ -447,6 +447,28 @@
     *Aaron Stone + Rafael Mendonça França*
 
 *   `Relation#merge` now only overwrites where values on the LHS of the
+=======
+*   Belongs_to :touch behavior now touches old association when
+    transitioning to new association
+
+        class Passenger < ActiveRecord::Base
+           belongs_to :car, touch: true
+        end
+
+        car_1 = Car.create
+        car_2 = Car.create
+
+        passenger = Passenger.create :car => car_1
+
+        passenger.car = car_2
+        passenger.save
+
+    Previously only car_2 would be touched. Now both car_1 and car_2
+    will be touched.
+
+    *Adam Gamble*
+
+*   Relation#merge now only overwrites where values on the LHS of the
     merge. Consider:
 
         left  = Person.where(age: [13, 14, 15])