Merge pull request #41516 from kamipo/serialized_value_should_be_type_casted_by_subtype

Serialized value on the enum attribute should be type casted by the subtype

activerecord/lib/active_record/enum.rb

@@ -140,7 +140,7 @@ module ActiveRecord
       end
 
       def serialize(value)
-        mapping.fetch(value, value)
+        subtype.serialize(mapping.fetch(value, value))
       end
 
       def assert_valid_value(value)

activerecord/test/cases/enum_test.rb

@@ -92,6 +92,14 @@ class EnumTest < ActiveRecord::TestCase
     assert_equal books(:ddd), Book.where(last_read: "forgotten").first
   end
 
+  test "find via where should be type casted" do
+    book = Book.enabled.create!
+    assert_predicate book, :enabled?
+
+    enabled = Book.boolean_statuses[:enabled].to_s
+    assert_equal book, Book.where(boolean_status: enabled).last
+  end
+
   test "build from scope" do
     assert_predicate Book.written.build, :written?
     assert_not_predicate Book.written.build, :proposed?