Postmark::ApiInputError with attachments about postmark-rails

[tomek-ac]

Both ways should work. This works too in the example I gave:

    mail(to: to).attachments["appointment"] = { mime_type: "text/calendar", content: cal.to_ical }

Anyway, I'm glad you solved the issue!

[tomek-ac]

@akaspick I can't replicate the issue. I am able to send emails with iCal attachments and here's what I did:

1. I created a new branch new Rails 7 app
2. Added postmark-rails and icalendar to Gemfile
3. Set up environment following environment variables:

export POSTMARK_SERVER_TOKEN=<YOUR TOKEN>
export DEFAULT_FROM=<YOUR FROM EMAIL ADDRESS>
export DEFAULT_TO=<YOUR TEST TO EMAIL ADDRESS>

4. Added following to the config/application.rb:

    config.action_mailer.delivery_method = :postmark
    config.action_mailer.postmark_settings = { api_token: ENV.fetch("POSTMARK_SERVER_TOKEN") }

5. Added a new mailer:

bin/rails g mailer Test email_with_attachment

# app/mailers/test_mailer.rb
class TestMailer < ApplicationMailer
  default from: ENV.fetch("DEFAULT_FROM")

  def email_with_attachment(to: ENV.fetch("DEFAULT_TO"))
    @greeting = "Hi"

    # Create a calendar with an event (standard method)
    cal = Icalendar::Calendar.new
    cal.event do |e|
      e.dtstart     = 1.day.from_now + 1.hour
      e.dtend       = 1.day.from_now + 3.hours
      e.summary     = "Some event"
      e.description = "With a description"
    end

    attachments["appointment"] = { mime_type: "text/calendar", content: cal.to_ical }

    mail to: to
  end
end

6. And I can successfully send the emails with a command like this:

bin/rails r "TestMailer.email_with_attachment.deliver_now"

Could you give us more details on how you're sending the emails? It looks that there is an issue with configuring the stream. We'd need a bit more context to be able to help you.

[akaspick]

@tomek-ac I believe I've solved the issue...

I was specifying the attachment as
mail.attachments['appointment.ics'] = {mime_type: 'text/calendar', content: @appointment.to_ical}
but had to instead use
attachments['appointment.ics'] = {mime_type: 'text/calendar', content: @appointment.to_ical}

The former syntax works via test/specs and other mailers, but it didn't work when sending via postmark. The latter syntax works now for me without specifying mail at the start. The action mailer docs use the former syntax so there appears to be a bit of a compatibility issue: https://api.rubyonrails.org/classes/ActionMailer/Base.html#method-i-attachments