dynamic_mapper.rb

class Array
  def method_missing(method, *args, &block)
    if key_value = dynamic_mapper?(method)
      map_dynamically(key_value[1], key_value[2])
    else
      super
    end
  end

  def dynamic_mapper?(method)
    /^map_([_a-zA-Z]\w*)_to_([_a-zA-Z]\w*)$/.match(method.to_s)
  end

  def map_dynamically(key, value)
    inject({}) do |result, hash|
      result.update(hash[key] => hash[value])
    end
  end
end

project_hashes = [{'name' => 'suspenders', 'color' => 'green'}, {'name' => 'shoulda', 'color' => 'green'}]
puts project_hashes.map_name_to_color.inspect