3 files changed, 11 insertions, 1 deletions
diff --git a/activerecord/lib/active_record/relation/predicate_builder.rb b/activerecord/lib/active_record/relation/predicate_builder.rb
index 4a4ceca782..f734cd0ad8 100644
--- a/activerecord/lib/active_record/relation/predicate_builder.rb
+++ b/activerecord/lib/active_record/relation/predicate_builder.rb
@@ -48,7 +48,6 @@ module ActiveRecord
     end
 
     def build(attribute, value)
-      # FIXME: Deprecate this and provide a public API to force equality
       if table.type(attribute.name).force_equality?(value)
         bind = build_bind_attribute(attribute.name, value)
         attribute.eq(bind)
diff --git a/activerecord/lib/active_record/type/serialized.rb b/activerecord/lib/active_record/type/serialized.rb
index e882784691..0a2f6cb9fb 100644
--- a/activerecord/lib/active_record/type/serialized.rb
+++ b/activerecord/lib/active_record/type/serialized.rb
@@ -51,6 +51,10 @@ module ActiveRecord
         end
       end
 
+      def force_equality?(value)
+        coder.respond_to?(:object_class) && value.is_a?(coder.object_class)
+      end
+
       private
 
         def default_value?(value)
diff --git a/activerecord/test/cases/serialized_attribute_test.rb b/activerecord/test/cases/serialized_attribute_test.rb
index 7764a37273..4cd4515c3b 100644
--- a/activerecord/test/cases/serialized_attribute_test.rb
+++ b/activerecord/test/cases/serialized_attribute_test.rb
@@ -159,6 +159,13 @@ class SerializedAttributeTest < ActiveRecord::TestCase
     assert_equal(settings, Topic.find(topic.id).content)
   end
 
+  def test_where_by_serialized_attribute_with_array
+    settings = [ "color" => "green" ]
+    Topic.serialize(:content, Array)
+    topic = Topic.create!(content: settings)
+    assert_equal topic, Topic.where(content: settings).take
+  end
+
   def test_where_by_serialized_attribute_with_hash
     settings = { "color" => "green" }
     Topic.serialize(:content, Hash)