It says to update the nav section in the layout in ‘/lib/rumbl_web/templates/layout/app.html.eex’. I have 3 files in that directory and they are all .heex files. ‘app.html.heex’ does not have an existing nav section. There is a nav in ‘root.html.heex’ and when I implement the changes there, it all seems to work.
Looks like Phoenix has changed the default distribution of template code to separating it into a main “root” part in root.html.eex that includes the HTML header and putting in the body via “app.html.eex”. So the book should change that.
Also <%= render @view_module, @view_template, assigns %> should be changed to <%= @inner_content %>. This should also be applied on Page 57.