Fix #68

lib/ulid/rails.rb

@@ -51,5 +51,6 @@ def ulid_extract_timestamp(ulid_column, timestamp_column = :created_at)
     ActiveRecord::Type.register(:ulid, ULID::Rails::SqliteType, adapter: :sqlite)
     ActiveRecord::Type.register(:ulid, ULID::Rails::SqliteType, adapter: :sqlite3)
     ActiveRecord::ConnectionAdapters::TableDefinition.include(Patch::Migrations)
+    ActiveRecord::FixtureSet.singleton_class.prepend(Patch::FixtureSet)
   end
 end

lib/ulid/rails/patch.rb

@@ -8,6 +8,16 @@ def virtual_ulid_timestamp(timestamp_column_name, ulid_column_name)
             as: "FROM_UNIXTIME(CONV(HEX(#{ulid_column_name} >> 80), 16, 10) / 1000.0)"
         end
       end
+
+      module FixtureSet
+        def identify(label, column_type = :integer)
+          if column_type == :ulid
+            ULID::Rails::Type.new.serialize(label.to_s)
+          else
+            super
+          end
+        end
+      end
     end
   end
 end

lib/ulid/rails/type.rb

@@ -5,6 +5,10 @@
 module ULID
   module Rails
     class Type < ActiveModel::Type::Binary
+      def type
+        :ulid
+      end
+
       def assert_valid_value(value)
         raise ArgumentError, "`#{value}` is not a ULID format" unless Data.valid_ulid?(value)
       end