alias visitor_for to for

lib/arel/nodes/node.rb

@@ -22,7 +22,7 @@ def and right
       #
       # Maybe we should just use `Table.engine`?  :'(
       def to_sql engine = Table.engine
-        viz = Visitors::ToSql.new engine
+        viz = Visitors.for engine
         viz.accept self
       end
     end

lib/arel/visitors.rb

@@ -24,5 +24,6 @@ module Visitors
     def self.visitor_for engine
       ENGINE_VISITORS[engine]
     end
+    class << self; alias :for :visitor_for; end
   end
 end