Value of USE TEMPLATE in admin is wrong, but template is used

[Schwankenson]

I`m using Version 3.6.0.

I created a email template in database admin. And then sent mail with this command:

        mail.send(
            '[email protected]', # List of email addresses also accepted
            '[email protected]',
            template='user_cancelled_subscription', # Could be an EmailTemplate instance or name
            context={'foo': 'bar'},
        )

Email subject and content is filled with values from the template, everything seems to work fine. But in admin, there is a red cross below USE TEMPLATE:

And when I click filter user_cancelled_subscription for the "By Name" filter, the email is not shown.

What could be wrong? This is really confusing.

[Schwankenson]

Same problem exists with this code:

    mail_template = EmailTemplate.objects.get(id=2)

    mail.send(
        '[email protected]', # List of email addresses also accepted
        '[email protected]',
        template=mail_template, # Could be an EmailTemplate instance or name
        context={'foo': 'bar'},
    )

[Schwankenson]

Another test:

mail_template = EmailTemplate.objects.get(name="user_cancelled_subscription")

email = mail.send(
    '[email protected]', # List of email addresses also accepted
    '[email protected]',
    template=mail_template, # Could be an EmailTemplate instance or name
    context={'foo': 'bar'},
)

email.template = mail_template
email.save()

Like this, the template is shown in admin and filter works. But the template variables are not filled anymore.

[selwin]

Yeah this seems to be a bug. Mind opening a PR for this? If template is passed to mail.send(), use_template should be True.

[Schwankenson]

I don`t have the time to fix this and open a PR at the moment...somebody else? Should be easy to fix, right?