Personalization Subject Override results in (no subject)

[willfolsom]

Any current known issues with setting the subject of a personalization?

personalization.Subject = "This should override the subject!"
newV3Mail.AddPersonalizations(personalization)

I'm getting an email with no subject. The template has an empty subject field. Everything else works as expected.

This does not resolve it either.

newV3Mail.Subject = "OVERRIDE!"

I saw a previous issue where the answer seemed to be setting the subject in the template, which I'm ok with doing to an extent, but I definitely have the use case for this (i.e. using same template with a custom message body (working), and a dynamic subjects like "Thank You for Paying Invoice #123" or even "Hello, [cutomer name]!").

Thanks!

[JenniferMah]

Hi @willfolsom,
Based on the two lines of code you provided it looks like you are setting the subject correctly. Can you include the rest of your code that you are using to send email with Sendgrid-go? Have you had a chance to try out the code sample for sending a personalization email?

[willfolsom]

Yes I've tried the snippet. Here is my implementation.

func (sgi *SendGridInteractor) SendSendGridEmail(emailInfo SendGridEmailInfo) error {
	newV3Mail := mail.NewV3Mail()

	newV3Mail.SetFrom(mail.NewEmail(sgi.config.DefaultFromName, sgi.config.DefaultFromEmail))

	if emailInfo.TemplateId == "" {
		emailInfo.TemplateId = BaseTemplateWithMessageBodyId
	}

	newV3Mail.SetTemplateID(emailInfo.TemplateId)

	personalization := mail.NewPersonalization()
	tos := []*mail.Email{
		mail.NewEmail(emailInfo.ToName, emailInfo.ToEmail),
	}
	personalization.AddTos(tos...)

	for _, element := range *emailInfo.MessageBodyValues {
		personalization.SetDynamicTemplateData(element.Key, element.Value)
	}

	if emailInfo.Subject == "" {
		emailInfo.Subject = DefaultEmailSubject
	}

	// The subject can be overridden here, otherwise it uses the template subject.
	// Currently getting emails with (no subject) if it's overridden, but I've asked about this on the repo.
	// This doesn't resolve it either: --> newV3Mail.Subject = "OVERRIDE!"
	personalization.Subject = emailInfo.Subject
	newV3Mail.AddPersonalizations(personalization)

	request := sendgrid.GetRequest(sgi.config.SecretKey, sgi.config.Endpoint, sgi.config.Host)
	request.Method = "POST"
	request.Body = mail.GetRequestBody(newV3Mail)

	if err := sgi.port.SendSendGridRequest(&request); err != nil {
		return err
	}

	return nil
}

[willfolsom]

@JenniferMah Any update?

[childish-sambino]

From the API docs for the templateId param:

An email template ID. A template that contains a subject and content — either text or html — will override any subject and content values specified at the personalizations or message level.

Based on this, there is an API limitation where the template's subject/content will always win out.

[willfolsom]

@childish-sambino That is unfortunate. Maybe in the future this will be allowed. I have direct use cases for it.