From: Brian Candler <b.candler@...>
Date: 2009-04-15T21:52:47+09:00
Subject: Re: how to sort my hash

Sukhwinder Tambar wrote:
> i try my_hash.sort_by { |k,v| v.business_continuity ? 1 : 0 }
> 
> this give me following error
> 
> merb : worker (port 4000) ~ undefined method `business_continuity' for 
> nil:NilClass - (NoMethodError)

This means that v is nil. That is, your hash has a key pointing to a nil 
value.

Try:

   my_hash.each { |k,v| puts "key=#{k.inspect}, val=#{v.inspect}" }

to see what k,v pairs you are getting.

But what you showed above was definitely not a hash, it was an array. 
Hashes look like
  {key=>value, key=>value, ...}

arrays look like
  [value, value, ...]
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