visit

# File activerecord/lib/arel/visitors/visitor.rb, line 28
        def visit(object, collector = nil)
          dispatch_method = dispatch[object.class]
          if collector
            send dispatch_method, object, collector
          else
            send dispatch_method, object
          end
        rescue NoMethodError => e
          raise e if respond_to?(dispatch_method, true)
          superklass = object.class.ancestors.find { |klass|
            respond_to?(dispatch[klass], true)
          }
          raise(TypeError, "Cannot visit #{object.class}") unless superklass
          dispatch[object.class] = dispatch[superklass]
          retry
        end