Ruby Cannot Convert Hash Into Int

Question

I have a ruby bash script to download a zip file and output a progress bar to the stdout. I have the following

# Temp file name
tmp = ActiveSupport::SecureRandom.hex(8)
file = temp_dl_dir+tmp+'.zip'

print file.inspect

# Download
progress_bar = nil
open(file, 'w', :content_length_proc => lambda { |length|
  if length && 0 < length
    progress_bar = ProgressBar.new('...', length)
    progress_bar.file_transfer_mode
  end 
},
:progress_proc => lambda { |progress|
  progress_bar.set(progress) if progress_bar
}) do |fo|
    fo.print open(dl).read
end

But when I run it I get

open-uri.rb:32:in `initialize': can't convert Hash into Integer (TypeError)
    from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/open-uri.rb:32:in `open_uri_original_open'
    from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/open-uri.rb:32:in `open'
    from ./site.rb:191 (line 191 is the open(file, 'w' ...) one)

Which means there is a problem with my open(file, 'w' ... function

I can't figure out what's wrong +_+

I was just about to ask the same thing. Which line is the stack trace complaining about? — nickgroenke
– nickgroenke, Commented Jun 28, 2012 at 21:53
Line 191 is the open(file, 'w', ...) one... Line 32 is def is_dir?(directory) — Steven
– Steven, Commented Jun 28, 2012 at 21:53
Oh I wonder if the problem is with the third argument in open? The third argument in open is ":content_length_proc => lambda..." which is a hash. The stack trace is talking about open-uri.rb:32. So maybe that call to open is expecting the third argument to be an Int. — nickgroenke
– nickgroenke, Commented Jun 28, 2012 at 21:56
is_dir? has nothing to do with this, the 32 is open-uri.rb line 32, do you want me to post open-uri.rb gem code? I can do that if you want, but I didn't write it. The proble is line 191, which is the open(file, 'w' line — Steven
– Steven, Commented Jun 28, 2012 at 21:59
@NiklasB.: The error that the stack trace mentions is not in his file. It is in open-uri.rb which is a ruby lib for opening a file at a URI. — nickgroenke
– nickgroenke, Commented Jun 28, 2012 at 21:59

sarnold · Accepted Answer · 2012-06-28 22:10:04Z

4

The :content_length_proc appears to be related to OpenURI::OpenRead#open. (Check by ri open then search for :content_length_proc.)

My ri documentation on this method says:

However, mode must be read mode because OpenURI::OpenRead#open doesn't support write mode (yet). Also perm is ignored because it is meaningful only for file creation.

So you cannot use OpenURI::OpenRead#open with 'w' mode. You must either use a different mechanism to write to your URL if that is your actual goal. (Your English description says you're trying to download a file, but you wouldn't be using 'w' mode to the OpenURI::OpenRead#open method in that case...)

answered Jun 28, 2012 at 22:10

sarnold

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