# File lib/moneta/adapters/mongo.rb, line 100
      def create(key, value, options = {})
        key = to_binary(key)
        @collection.insert(value_to_doc(key, value, options))
        true
      rescue ::Mongo::OperationFailure => ex
        raise if ex.error_code != 11000 # duplicate key error
        false
      end