How to replace render_existing/3 with function_exported?/3

[AlchemistCamp]

@LostKobrakai

From those meta functions you can also call your existing templates using:

render("_meta.#{assigns.template}", assigns)

The trickiest part is how to programatically determine if that template exists and is safe to call. E.g., in many cases, _meta.show.html.eex exists, but _meta.edit.html.eex does not (since SEO isn’t a concern for that action).