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While reading this blog article about RSS templating, I came across the following twig code
if craft.app.request.segments|last == _self
I understand that the above command, in general, yields URL components as an array. But I don't understand under what scenario is the above condition true. What does _self mean in this context?
In Twig 2, _self seems to reference the name of the current template file.
Running {{ dump(_self) }} from the file /templates/test/index.twig would return the string test/index.
So what it's being used for in this example...
{% if craft.app.request.segments|last == _self %}
... is to test wether the last segment in the URL matches the template file. Or "is this template being loaded directly from the file-based routing or is it being included from another template?"
I would point out tho, this only matches the last segment. It assumes your feed.rss file it in the root templates directory. A more flexible approach would be to math the entire URI path.
{% if craft.app.request.pathInfo == _self %}
Later _self is used to generate a link with {{ url(_self) }}. This is the same as {{ url('feed.rss') }} but would update if you changed the file name (e.g. news.rss).
The whole point of that conditional is to replace the {% include 'feed.rss' %} with a <link rel="alternate" type="application/rss+xml" href="{{ url('feed.rss') }}">. Which seems a little complicated. After all, it provoked this Stack Exchange question. ;)
