old-pruning-excersise/lib/http/query.rb

module Pruning
  module HTTP
    # Whitelists the URL query parameters
    class Query < Struct.new(:name, :indicator_ids)
      def initialize(params = {})
        symbolised = params.map { |k, v| { k.to_sym => v } }.reduce({}, :merge)
        values = members.map do |member|
          value = symbolised.fetch(member, nil)
          next if value.nil?
          case member
          when :indicator_ids then value.map(&->(indicator_id) { indicator_id.to_i }) # break on purpose if indicator_ids is not an array
          when :name then value.to_s.gsub(/[^A-Za-z]/, '')
          else value
          end
        end
        super(*values)
      end
    end
  end
end