mongo里面根據對象字段的ID查詢 db.Photo.find({'owner.$id':ObjectId('xxxx')}) , 並且使用forEach循環修改查詢的數據

var ones = db.Photo.find({'owner.$id':ObjectId("5344f0dab7c58e8e098b4567")})

 

db.Photo.find({'owner.$id':ObjectId("5344f0dab7c58e8e098b4567")}).forEach(function(o){o.owner=null;db.Photo.save(o)});