File.open.each() while using a 2 level hash

rubyonrails-talk
1

I am doing: SourceHash = {} File.open("file_to_open").each {|line|   SourceHash[var[3]] = {}   puts SourceHash['VALUE']['cktid'] }

var is just an array of each csv value.

The error says undefined method for nil:NilClass in 'each'

If I take the hash statement out of the file loop it works. Any ideas why the "each" method is throwing an error while trying to get a value out of a 2 level hash??

2

Unless var[3] == 'VALUE' then SourceHash['VALUE'] is going to return a nil, and your puts expression amounts to nil['cktid'], which would produce the error you describe.

Also--in ruby, variables that begin w/capital letters are constants--you should rename to source_hash or something in order to decrease your risk of confusing the interpreter.

HTH,

-Roy