Validation spike 2

gistfile1.txt

  class RidesIndexParamValidation
    MAX_LIMIT = 200

    attr_reader :result, :failure_details

    def initialize(params)
      @params = params
      @result = :unspecified
    end

    def execute
      [:check_limit_presence, :check_limit_is_positive_integer, :check_limit_range].each do |method_name|
        send(method_name)
        return unless failed?
      end
      @result = :pass
    end

    def failed?
      if @result == :unspecified
        nil
      else
        @result == :failure
      end
    end

    private
    def fail(reason, attributes = {})
      @failure_details = attributes.merge(reason: reason)
      @result = :failure
    end

    def check_limit_range
      if @params[:limit].to_i > MAX_LIMIT
        fail(:limit_is_too_high, max: MAX_LIMIT)
      end
    end

    def check_limit_presence
      if @params[:limit].blank?
        fail(:no_limit)
      end
    end

    def check_limit_is_positive_integer
      if !params[:limit].match(/\A[0-9]+\Z/)
        fail(:invalid_limit)
      end
    end

  end