validation - Rails 4 model scope to created_at == current_month -

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मेरे रेल 4 मॉडल में, मेरे पास यह है: 

  class PhoneContact & lt; ActiveRecord :: बेस मान्य: फोन_एनम्बर, विशिष्टता: {स्कोर:: call_type}   
 यह विचार यह सुनिश्चित करना है कि मेरे  PhoneContact  मॉडल पर प्रत्येक फ़ोन नंबर अद्वितीय है, Call_type द्वारा।  
 मैं भी एक कदम आगे जाना चाहता हूं और "इस मॉडल को इस माह बनाया गया था" तो, मेरा  फोन_एनम्बर   call_type  और  created_at == Time.now.month  द्वारा अनूठा होना चाहिए।  
 मैं कैसे कर सकता हूं <
 
 
 आप इसके लिए  conditions  विकल्प का उपयोग कर सकते हैं:   
 P> 
  मान्य: फोन_एनम्बर, विशिष्टता: {दायरा:: call_type, शर्तें: - & gt;      के लिए उपलब्ध विकल्पों की जांच करें {where (created_at: Time.now.month)}}

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