date_arithmetic.rb in sequel-4.31.0

- old
+ new

@@ -1,5 +1,7 @@
+# frozen-string-literal: true
+#
 # The date_arithmetic extension adds the ability to perform database-independent
 # addition/substraction of intervals to/from dates and timestamps.
 #
 # First, you need to load the extension into the database:
 #
@@ -71,10 +73,10 @@
           end
           h = da.interval
           expr = da.expr
           cast = case db_type = db.database_type
           when :postgres
-            interval = ""
+            interval = String.new
             each_valid_interval_unit(h, DEF_DURATION_UNITS) do |value, sql_unit|
               interval << "#{value} #{sql_unit} "
             end
             if interval.empty?
               return literal_append(sql, Sequel.cast(expr, Time))