.IsMenuCurrent returns false for single pages

support
1

I am using .IsMenuCurrent to set an is-active flag for my navbar links. Here is a minimal version of my navbar (assuming no children):

<nav class="navbar" role="navigation">
    <div class="navbar-end">
      {{ $currentPage := . }}
      {{ range .Site.Menus.main }}
        <a class="navbar-item{{ if $currentPage.IsMenuCurrent "main" . }} is-active{{ end }}" href="{{ .URL | relURL }}">
            {{ .Name }}
        </a>
      {{ end }}
    </div>
</nav>

And here is the relevant part of my config file:

[menu]
  [[menu.main]]
    name = "Home"
    url = "/"
    weight = 1

  [[menu.main]]
    name = "Posts"
    url = "/posts/"
    weight = 2

   [[menu.main]]
    name = "Projects"
    url = "/projects/"
    weight = 3

  [[menu.main]]
    name = "Teaching"
    url = "/teaching/"
    weight = 4

  [[menu.main]]
    name = "People"
    url = "/people/"
    weight = 5

For reference, I have an _index.html template for “Home”, “Posts” and “Projects” are sections that use a _default/list.html template, and “Teaching” and “People” are single pages that use a _default/single.html. When I am on the “Home”, “Posts”, or “Projects” page, {{ if $currentPage.IsMenuCurrent "main" . }} returns true and the appropriate navbar link is active. However, when I am on the “Teaching” or “People” page, {{ if $currentPage.IsMenuCurrent "main" . }} returns false and the navbar links are inactive. This is unexpected behavior, but I’m having a hard time figuring out where I’m going wrong. The only difference between these pages is that they use the _default/single.html template.

Any thoughts would be greatly appreciated. Thanks!