From: Peter Hickman <peterhickman386@...>
Date: 2010-05-05T21:04:43+09:00
Subject: Re: troubles with nested hashes

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When you do this

devices['macaddr'] = line[0]

You are saying that the hash 'devices' has the key 'macaddr' and that
contains the value that is held in 'line[0]'. Then you say

devices['macaddr']['packets'] = line[1]

This says that hash 'devices' has a key 'macaddr' which is a hash!

For this to work, as written, the line[0] needs to be a hash. I suspect that
it is not. What you probably want is this

Csv.parse(whatever) do |line|
  macaddr = line[0]

  # Notice there are no quotes
  devices[macaddr] = {
    'packets' => line[1],
    'ip' => line[2],
    ... etc
  }
end

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