Rails name/hex lookup

class ColorsController < ApplicationController

  # Define colors catalog
  @@colors = [
    ['red',   'f00'],
    ['green', '0f0'],
    ['blue',  '00f']
  ]

  # Define column names
  @@indexes = {
    'name' => 0,
    'hex'  => 1
  }

  # Index method
  def index

    # Define result
    @result = {}

    # We "try" some code ...
    begin

      # Throw an error if parameter "what" or "which" is not provided
      [:what, :which].each{ |param| raise "Parameter '#{param}'  not provided." if params[param].nil? }

      # Throw an error unless parameter "what" is found in indexes
      raise 'Parameter "what"  not in catalog.' unless @@indexes.has_key? 'name'

      # Find the matching row in catalog via parameter "which"
      # Note: Binary flip used here.  1-x  =>  1-1=0  or  1-0=1
      row_found = @@colors.find{ |color| color[1 - @@indexes[params[:what]]] == params[:which] }

      # Throw an error if parameter "which" is not found in catalog
      raise 'Parameter "which" not in catalog.' if row_found.nil?

      # Format output
      @result[:message] = row_found[@@indexes[params[:what]]]
      @result[:status]  = true

    # ... and catch an error if necessary (and format output)
    rescue StandardError => error
      @result[:message] = error
      @result[:status]  = false

    end
  end
end