Question

I’m trying to ensure that a variable value is non-nil before proceeding – the value is instantiated asynchronously depending on request activity at a Sinatra instance

attr_accessor :access_token

until !@access_token.nil?
  @access_token = RestClient.get @callback_URI + '/access_token/' + @request_Id 
end

puts @access_token #=> always get output even if @access_token is nil

My understanding is that the expression means: ‘keep assigning the value of the RestClient call to @access_token until it returns a non-nil value, and then exit the until block’. What have I done wrong? Many thanks!

Answer 1

I don’t know what your server returns, but I would try something like,

while true
   begin
      @access_token = RestClient.get @callback_URI + '/access_token/' + @request_Id
      break if @access_token.code == 200
   rescue
      $stderr.puts "failed to get access token"
   end
   sleep 1
end