Nav:Breadcrumbs on collections

[mstratman]

Is it possible to generate breadcrumbs for a collection?

{{ nav:breadcrumbs }} fails to iterate over the parent, and instead always shows Home as the only entry in the hierarchy.

I can confirm the grandparent/parent/child relationships are correct by using {{ nav:collection:c :from="uri" }} to show and dive into children.

---

Details of what I'm using to diagnose:
I use this to dive down through the hierarchy, from the grandparent clicking the parent, then from the parent clicking the child.

  <h2>Subcategories from nav</h2>
  <ul>
  {{ nav:collection:c :from="uri" }}
    {{ unless no_results }}
      <li><a href="{{ url }}">{{ title }}</a></li>
    {{ /unless }}
  {{ /nav:collection:c }}
  </ul>

But on each page, the following snippet only shows (on the child page, for example) "Home > Child" rather than "Home > Grandparent > Parent > Child"

  <h2>breadcrumbs</h2>
  {{ nav:breadcrumbs }}
    {{ if is_current }}
      {{ title }}
    {{ else }}
      <a href="{{ url }}">{{ title }}</a>
      &gt;
    {{ /if }}
  {{ /nav:breadcrumbs }}

[mstratman]

Looking at the code it didn't seem possible, so if anyone else needs to do this, here's what I have at the moment.

I created a tag with the following:

    public function index()
    {
      $rv = array();

      $parent_page = $this->context->get('parent');
      $parent = null;
      if ($parent_page) {
        $raw = $parent_page->raw();
        if ($raw) {
          $parent = Entry::find($raw->id());
          while (! is_null($parent)) {
            $kv = [ "title" => $parent->title, "url" => $parent->url ];
            array_unshift($rv, $kv);
            $parent = $parent->parent();
          }
        }
      }
    
      // add current page to the end without a URL
      if (count($rv)) {
        array_push($rv, [ "title" => $this->context->get("title"), "url" => null ]);
      }

      return $rv;
    }

With the corresponding template:

<div class="text-sm not-breadcrumbs">

  {{ pedalcrumbs }}
    {{ if no_results }}
    {{ else }}
      {{ if url }}
        <a href="{{ url }}">{{ title }}</a> 
      {{ else }}
        {{ title }}
      {{ /if }}
      {{ if !last }}    
        <span class="text-gray-400">&gt;</span>
      {{ /if }}
    {{ /if }}
  {{ /pedalcrumbs }}
</div>