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# Converts:
# {:hash => [{:foo => 1}, {:foo => 2}]}
# 
# To:
# {:hash => [{:foo => "1"}, {:foo => "2"}]}

a[:hash].each do |i| 
  i.each do |key,value| 
    i[key] = value.to_s
  end
end

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def stringify_values(x)
  case x
    when Hash: x.each_pair {|k,v| x[k] = stringify_values(v) }
    when Array: x.map {|a| stringify_values(a)}
    else x.to_s
  end
end

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# in-place version - modifies x
def stringify_values!(x)
  case x
    when Hash: x.each_pair {|k,v| x[k] = stringify_values(v) }
    when Enumerable: x.map! {|a| stringify_values(a)}
    else x.to_s
  end
end

# does not modify x, generates new arrays/hashes
def stringify_values(x)
  case x
    when Hash: x.inject({}) {|m,(k,v)| m[k] = stringify_values(v); m }
    when Enumerable: x.map {|a| stringify_values(a)}
    else x.to_s
  end
end