Fix reverse not working on reordering, which broke calling reorder('...').last.

Author: Octavian Neamtu

lib/squeel/adapters/active_record/4.1/relation_extensions.rb

@@ -225,7 +225,7 @@ def build_from
         def build_order(arel)
           orders = order_visit(dehashified_order_values)
           orders = orders.uniq.reject(&:blank?)
-          orders = reverse_sql_order(orders) if reverse_order_value && !reordering_value
+          orders = reverse_sql_order(orders) unless !reverse_order_value || (reordering_value && orders.empty?)
 
           arel.order(*orders) unless orders.empty?
         end

spec/squeel/adapters/active_record/relation_extensions_spec.rb

@@ -918,6 +918,26 @@ module ActiveRecord
             block.to_sql.should match /ORDER BY #{Q}people#{Q}.#{Q}id#{Q}/
           end
 
+          it 'returns the proper #first on reordering' do
+            queries = queries_for do
+              @standard.reorder{id.asc}.first
+            end
+            queries.size.should eq(1)
+            query = queries.first
+            query.should match /ORDER BY #{Q}people#{Q}.#{Q}id#{Q} ASC/
+            query.should_not match /ORDER BY #{Q}people#{Q}.#{Q}id#{Q} DESC/
+          end
+
+          it 'returns the proper #last on reordering' do
+            queries = queries_for do
+              @standard.reorder{id.asc}.last
+            end
+            queries.size.should eq(1)
+            query = queries.last
+            query.should match /ORDER BY #{Q}people#{Q}.#{Q}id#{Q} DESC/
+            query.should_not match /ORDER BY #{Q}people#{Q}.#{Q}id#{Q} ASC/
+          end
+
           it 'drops order by clause when passed nil' do
             block = @standard.reorder(nil)
             sql = block.to_sql