Chris Hill-Scott 054cd16d02 Ensure correct object renders V2 template preview ...

The `body` field of the ‘preview a template’ endpoint should contain the
content of the template with the placeholders replaced.

It should not be rendered into a plain text email, which does stuff like
normalising newlines (so `\r\n` becomes `\n`). However the object that
the `create_post_template_preview_response` function receives is an
instance of `PlainTextEmailTemplate`. So we can’t just call `str()` on
it. Instead we need to call the `__str__` method of
`WithSubjectTemplate` which gives us the result we want.

We were already doing this the right way in the V1 endpoint[1] but
forgot to do it here too.

1. 0108749daa/app/template/rest.py (L181-L184)

2020-04-07 17:09:59 +01:00

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