mongodb - The output of mongo is non-deterministic with native-ruby-mongo-mapper -


i ran problem happens randomly.

first, exsit?(collection, id) returned true

it means there has document in mongodb, have further check in next step

then (coll.find({_id: id}).first['history'].last['price'] raise error

#<nomethoderror: undefined method `last' nil:nilclass>

i don't why happens randomly.

code

  def exsit?(collection, id)     return (collection.find({_id: id}).first.nil? ) ? false : true   end    def is_price_changed?(coll, id, current_price)       if exsit?(coll, id)         return (coll.find({_id: id}).first['history'].last['price'] != current_price)? true : false       else         return true       end       end

this document format

{   "updated_at": new date(1435757280839),   "price": 16890,   "history": [     {       "updated_at": new date(1435757277672),       "price": 16890     }   ] }

it looks 'history' attribute of id nil


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