Hash to_snake_keys

	class Hash
	# Recursively converts CamelCase and camelBack JSON-style hash keys to
	# Rubyish snake_case, suitable for use during instantiation of Ruby
	# model attributes.
	#
	def to_snake_keys(value = self)
	case value
	when Array
	value.map { |v| to_snake_keys(v) }
	when Hash
	Hash[value.map { |k, v| [underscore_key(k), to_snake_keys(v)] }]
	else
	value
	end
	end
	private
	def underscore_key(k)
	if k.is_a? Symbol
	underscore(k.to_s).to_sym
	elsif k.is_a? String
	underscore(k)
	else
	k # Plissken can't snakify anything except strings and symbols
	end
	end
	def underscore(string)
	string.gsub(/::/, '/').
	gsub(/([A-Z]+)([A-Z][a-z])/,'\1_\2').
	gsub(/([a-z\d])([A-Z])/,'\1_\2').
	tr("-", "_").
	downcase
	end
	end

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