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ActionController::Routing::Routes.draw do |map|   
  map.purchase 'products/:id/purchase', :controller => 'catalog', :action => 'purchase'  
  ...   
end  
ActionController::Routing::Routes.draw do |map|
map.purchase 'products/:id/purchase', :controller => 'catalog', :action => 'purchase'
...
end
  ÕâÀÎÒ¶¨ÒåÁËÒ»¸öpurchaseµÄnamed route£¨µ±È»£¬ÄãÍêÈ«¿ÉÒÔʹÓÃconnect·½·¨¶¨ÒåÆÕͨµÄroute£©¡£Ç°Ò»ÆªÎÄÕÂÌáµ½¹ý£¬blockÖеÄmap¶ÔÏóÊÇMapperÀàµÄʵÀý£¬ÆäʵÄã¿ÉÒÔÏëÏóµ½£¬ÆäʵMapperÀಢûÓж¨Òåpurchase·½·¨£¨ÌìÖªµÀÄãÒª¸øÄãµÄnamed routeÆðɶÃû£¿´ä»¨£¿Íú²Æ£¿£©¡£ËùÓеÄÒ»ÇУ¬¶¼ÊÇͨ¹ýMapperÀàµÄmethod_missing·½·¨´¦ÀíµÄ¡£¾ßÌå´úÂëÈçÏ£º
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def method_missing(route_name, *args, &proc) #:nodoc:   
  super unless args.length >= 1 && proc.nil?   
  @set.add_named_route(route_name, *args)   
end  
def method_missing(route_name, *args,


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