1 files changed, 13 insertions, 1 deletions
diff --git a/activerecord/test/cases/nested_attributes_test.rb b/activerecord/test/cases/nested_attributes_test.rb
index 933dfac806..b8a0401fe3 100644
--- a/activerecord/test/cases/nested_attributes_test.rb
+++ b/activerecord/test/cases/nested_attributes_test.rb
@@ -1074,12 +1074,16 @@ class TestHasManyAutosaveAssociationWhichItselfHasAutosaveAssociations < ActiveR
       true
     end
 
+    def [](key)
+      @hash[key]
+    end
+
     def to_h
       @hash
     end
   end
 
-  test "strong params style objects can be assigned" do
+  test "strong params style objects can be assigned for singular associations" do
     params = { name: "Stern", ship_attributes:
                ProtectedParameters.new(name: "The Black Rock") }
     part = ShipPart.new(params)
@@ -1087,4 +1091,12 @@ class TestHasManyAutosaveAssociationWhichItselfHasAutosaveAssociations < ActiveR
     assert_equal "Stern", part.name
     assert_equal "The Black Rock", part.ship.name
   end
+
+  test "strong params style objects can be assigned for collection associations" do
+    params = { trinkets_attributes: ProtectedParameters.new("0" => ProtectedParameters.new(name: "Necklace"), "1" => ProtectedParameters.new(name: "Spoon")) }
+    part = ShipPart.new(params)
+
+    assert_equal "Necklace", part.trinkets[0].name
+    assert_equal "Spoon", part.trinkets[1].name
+  end
 end