ruby on rails - Routing with an optional parameter -

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मैंने मार्ग फाइल में जोड़ा: 

  map.show_book "/ show_book /: name / वर्ष / वर्ष: ",: नियंत्रक = & gt; "पुस्तक",: एक्शन = & gt; "Show_version"   
 मैंने यह भी कहा:  
  map.show_book "/ show_book /: name",: नियंत्रक = & gt; "पुस्तक",: एक्शन = & gt; वर्ष निर्दिष्ट किए बिना नवीनतम पुस्तक को दिखाने के लिए "show_version"   
।  
 लेकिन यह काम नहीं करता है, यह "show_book / NAME" में मार्ग नहीं मिल सकता है  
 धन्यवाद!  
 पी एस। मुझे पता है कि मैं "? Year = XXXX" के साथ पैरामीटर के रूप में वर्ष का उपयोग कर सकता हूं, लेकिन मैं यूआरएल के एक हिस्से के रूप में वर्ष का उपयोग करना चाहता हूं   
 
 
:  
  map.show_book "/ show_book /: नाम (/ वर्ष /: वर्ष)",: नियंत्रक = & gt; "पुस्तक",: एक्शन = & gt; "Show_version"   
 और दूसरे मार्ग को हटा दें।  
  अपडेट   
 उपरोक्त उत्तर केवल रेल के लिए है 3 और ऊपर। दो मार्गों की परिभाषाओं को उलझाकर समस्या तय की गई (नीचे एलेसेंड्रो की टिप्पणी देखें)।

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