Phoenix 1.7 no longer has views. As a consequence, the file structure of the project changed.
However, it is relatively easy to upgrade from version 1.5. This blog post shows how to do it.
In addition, the way to reference routes in a template changed. Phoenix now has compile-time
verified routes, which means that the links in the ping-pong example are now of the form:
<.link href={~p"/ping"}>Ping</.link>