ruby - Where clause and model function in Rails -

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यह मेरा मॉडल है: 

  class विज्ञापन & lt; ActiveRecord :: बेस attr_accessor: वर्तमान has_attached_file: छवि validates_attachment_content_type: image,: content_type = & gt; / एआइमेज.ए.ए.ई.एस.ए.एस.ए. डीएफ़ चालू सच नहीं है जब तक कि समय.नौना नहीं। Self.expires_on समाप्ति अंत   
 तब मैं यह कोशिश कर रहा हूं:  
    
 यहां त्रुटि है:  
  अज्ञात कॉलम 'ads.current' (स्थान: "डिस्पेंसर दिखाएँ साइडबार बाएं", वर्तमान: सही)  'क्लाज' में   
  मैं कहां धारा में मौजूदा कॉल कर सकता हूं?    
 
 
 अपने  वर्तमान  विधि को एक क्षेत्र में कनवर्ट करें:  
  class विज्ञापन & lt; ActiveRecord :: बेस attr_accessor: वर्तमान has_attached_file: छवि validates_attachment_content_type: image,: content_type = & gt; / एआइमेज ./.** z / क्षेत्र: वर्तमान, - & gt; {जहां (['समयसीमा समाप्त हो जाए और लेफ्टिनेंट;?', टाइम.न्यू])} एंड   
 और फिर इसे  जहां  स्थितियों  
  Ad.where (स्थान: "डिस्पेंसर शो साइडबार बाएं")। वर्तमान

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