feat: Added mail.reply_to_list support

[andrii-baran-nfgp]

Fixes

A short description of what this PR does.

Checklist

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[beld2107]

Hi,

Any chance this functionality can be added in the next version of the Gem?

[eterry1388]

We need this functionality as well. The gem is out of date from the docs.

[beld2107]

For anyone else, in the meantime I just monkey patched the class:

In Rails:
config/initializers/sendgrid_reply_to_list_patch.rb

# Add support for #reply_to_list, until they add support on their end
if SendGrid::Mail.instance_methods.include?(:reply_to_list)
  warn "SendGrid::Mail added support for #reply_to_list -> please remove #{__FILE__}"
  exit 1 # rubocop:disable Rails/Exit
else
  module SendGrid
    class Mail
      attr_accessor :reply_to_list

      alias_method :original_to_json, :to_json

      def to_json(*)
        result = original_to_json

        if @reply_to_list.present?
          result['reply_to_list'] = @reply_to_list.map { |reply_to|
            if reply_to.respond_to?(:to_json)
              JSON.parse(reply_to.to_json)
            else
              reply_to
            end
          }

          result.delete('reply_to') if result.key?('reply_to')
        end

        JSON.generate(result)
      end
    end
  end
end