Merge pull request rails#43445 from jstncarvalho/main

fix: duplicate active record objects on inverse_of

activerecord/lib/active_record/associations/collection_association.rb

@@ -456,6 +456,10 @@ def replace_on_target(record, skip_callbacks, replace:, inversing: false)
 
           yield(record) if block_given?
 
+          if !index && @replaced_or_added_targets.include?(record)
+            index = @target.index(record)
+          end
+
           @replaced_or_added_targets << record if inversing || index || record.new_record?
 
           if index

activerecord/test/cases/associations/inverse_associations_test.rb

@@ -766,6 +766,15 @@ def test_with_has_many_inversing_does_not_trigger_association_callbacks_on_set_w
     end
   end
 
+  def test_with_hash_many_inversing_does_not_add_duplicate_associated_objects
+    with_has_many_inversing(Interest) do
+      human = Human.new
+      interest = Interest.new(human: human)
+      human.interests << interest
+      assert_equal 1, human.interests.size
+    end
+  end
+
   def test_unscope_does_not_set_inverse_when_incorrect
     interest = interests(:trainspotting)
     human = interest.human