mysql - Not Selectors in Model, Rails -

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मेरे नाम के साथ एक मॉडल है वर्ग । मुझे user_id और category_id मेरे UserCategory मॉडल मिला है। मैं उन सभी श्रेणियों का चयन करना चाहता हूं जिसमें कोई विशिष्ट user_id नहीं है।

ऐसा कैसे करें?

मुझे एक ड्रॉपडाउन सूची बनाने की ज़रूरत है UserCategory मॉडल

सामान्य तौर पर, ActiveRecord के लिए अंतर्निहित समर्थन दिया गया है: 

  श्रेणी.where.not (user_id: id)   
 कई-से -किसी भी स्थिति,  श्रेणी  और  उपयोगकर्ता :  
  दिया गया श्रेणी। place.not (id: current_user.categories.pluck (: id) )   
 यह आईडी द्वारा वर्तमान उपयोगकर्ता की श्रेणियों को छोड़कर, सभी श्रेणियों को पकड़ लेगा।

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