# File lib/action_dispatch/routing/mapper.rb, line 393 def mount(app, options = nil) if options path = options.delete(:at) else options = app app, path = options.find { |k, v| k.respond_to?(:call) } options.delete(app) if app end raise "A rack application must be specified" unless path options[:as] ||= app_name(app) match(path, options.merge(:to => app, :anchor => false, :format => false)) define_generate_prefix(app, options[:as]) self end