1 files changed, 3 insertions, 5 deletions
diff --git a/activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb b/activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb
index 03ab48784a..adb9fcaeb8 100644
--- a/activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb
+++ b/activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb
@@ -318,7 +318,7 @@ module ActiveRecord
       alias :belongs_to :references
 
       def new_column_definition(name, type, options) # :nodoc:
-        type = aliased_types[type] || type
+        type = aliased_types(type.to_s, type)
         column = create_column_definition name, type
         limit = options.fetch(:limit) do
           native[type][:limit] if native[type].is_a?(Hash)
@@ -344,10 +344,8 @@ module ActiveRecord
         @native
       end
 
-      def aliased_types
-        HashWithIndifferentAccess.new(
-          timestamp: :datetime,
-        )
+      def aliased_types(name, fallback)
+        'timestamp' == name ? :datetime : fallback
       end
     end