ruby on rails - Many counts into a join? -

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मैं यह क्वेरी करना चाहता हूं: 

  SELECT COUNT (DISTINCT a.id) गणना के रूप में, राशि (बी.आईड) के रूप में एक INNER से जुड़ने से बी.आईडी = बी.आईडी WH = B.otherfield = 0;   
 एक पर 1 गिनती के साथ:  
  aclass.joins (: b) .where (bclass: {"otherfield" = 0})। Count ( : Id)   
 और कैसे एक गिनती अलग करना है?  गिनती (अलग: आईडी) ?  गिनती (: आईडी, विशिष्ट = & gt; सच) ? धन्यवाद!   
 
 
 रेल 3 में:  
  aclass.select ( "अलग करें a.id")। जुड़ती है (: बी)। जहां (bclass: {अन्य फ़ील्ड: 0})। पंक्ति   
 रेल 4 में:  
  Aclass.distinct.joins (: b) .where (bclass: {अन्य फ़ील्ड: 0}) .काउंट (: ​​आईडी)

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