Sinatra: Undefined method bytesize for Hash

ruby hash sinatra thin webrick
fullstackplus picture fullstackplus · Jun 6, 2013 · Viewed 9.4k times · Source

I'm creating a Sinatra app that takes an uploaded CSV file and puts its contents in a hash. When I reference this hash in my app.rb like so:

hash = extract_values(path_to_filename)

I keep getting this error message:

undefined method `bytesize' for Hash:0x007fc5e28f2b90 #object_id

file: utils.rb location: bytesize line: 335

I read somewhere that this is a Webrick issue. I switched to Thin, the error's the same.

My hash / CSV file is of very small size, so it can't be the issue.

I'm using ruby 1.9.3p374.

Thanks!

Answer

Luke Antins picture Luke Antins · Jun 9, 2013

This looks like a duplicate of Undefined method `bytesize' for #<Hash>

Sinatra is expecting a string be returned (i.e. last line) of the route method; you can't just return a straight hash.

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