ruby on rails - Getting ActiveRecord association id in callback function -

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मेरे पास दो संबंधित मॉडल, कर्मचारी और चिकित्सक हैं: 

  वर्ग कर्मचारी & lt; ActiveRecord :: बेस है_ऑन: डॉक्टर, आश्रित = & gt; : नष्ट ... अंतिम कक्षा डॉक्टर & lt; ActiveRecord :: बेस is_to: कर्मचारी का अंत   
 जब चिकित्सक पहले से ही बनाया और सहेजा जा चुका है। 
 मैं कर्मचारियों के डॉक्टर आईडी तक पहुंच प्राप्त करना चाहता हूं:   < पूर्व>  क्लास कर्मचारी & lt; ActiveRecord :: बेस ... after_save: save_picture ... निजी def save_picture अगर डॉक्टर file_name = 'doctor_' + doctor.id.to_s + '.jpg' ... end end end   
 मैं किसी भी डॉक्टर विधि तक पहुंच प्राप्त कर सकता हूं और उनमें से कोई भी ठीक काम करता है, लेकिन "आईडी" - यह "शून्य" देता है। 
 क्या मैं गलत कर रहा हूं?   
 
 
 क्या आपके डॉक्टर मॉडल में आईडी एसेसर है?  
  doctor.id  के बजाय  कोड>, एक डेटाबेस क्वेरी कम:)

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