Issue using index in single.html

support
1

Hello all!

I’m having an issue with my single.html. I’m trying to use a with index statement but it’s not working as expected.

single.html:

{{ define "main" }}
	<article class="post h-entry">
		<h1 class="post-title p-name" itemprop="name headline">
            <a href="{{ .Permalink }}">{{ .Title }}</a> {{ if .Draft }}(Draft){{ end }}
        </h1>
        <div class="image">
			<img src="{{ .Params.cover_image }}">
        </div>
		<div class="post-content e-content" itemprop="articleBody">
            {{ .Content | safeHTML }}
        </div>

		<p class="meta">
            Posted on <span class="postdate"><time class="dt-published">{{ .Site.Params.DateForm | default "Jan 2, 2006" | .Date.Format }}</time></span>
            {{ with index .Site.Data.authors .Params.author }}
		    by <span class="p-author h-card"><a href="{{ .link }}">{{ .name }}</a>
		    <img class="u-photo" style="display: none;" src="{{ .photo }}" />
		    </span>
            {{ end }}
        </p>
	</article>
{{ end }}

Problem code:

            {{ with index .Site.Data.authors .Params.author }}
		    by <span class="p-author h-card"><a href="{{ .link }}">{{ .name }}</a>
		    <img class="u-photo" style="display: none;" src="{{ .photo }}" />
		    </span>
            {{ end }}

When running this way I receive the error

execute of template failed at <index .Site.Data.authors .Params.author>: error calling index: value is nil; should be of type string render of "page" failed: value is nil; should be of type string  failed to render pages: value is nil; should be of type string

If I replace .Params.author with a string like, "phil" then the code works as expected.

Post frontmatter:

---
title: "Xyz"
date: 2022-08-23T10:54:07-07:00
draft: false
slug: "xyz"
description: "Testing site"
author: "phil"
tags:
  - go
cover_image: https://example.org/imgs/sdl2-logo.png
---

So the question is how is .Params.author empty? I can print it to the page just before the with index.

3

The error is thrown because one or more of your content pages is missing the author front matter. You need to code defensively for this.

diff --git a/layouts/_default/single.html b/layouts/_default/single.html
index 54cf47b30..fcebe4e21 100644
--- a/layouts/_default/single.html
+++ b/layouts/_default/single.html
@@ -7,15 +7,17 @@ <h1 class="post-title p-name" itemprop="name headline">
                        <img src="{{ .Params.cover_image }}">
         </div>
                <div class="post-content e-content" itemprop="articleBody">
-            {{ .Content | safeHTML }}
+            {{ .Content }}
         </div>
 
                <p class="meta">
             Posted on <span class="postdate"><time class="dt-published">{{ .Site.Params.DateForm | default "Jan 2, 2006" | .Date.Format }}</time></span>
-            {{ with index .Site.Data.authors .Params.author }}
-                   by <span class="p-author h-card"><a href="{{ .link }}">{{ .name }}</a>
-                   <img class="u-photo" style="display: none;" src="{{ .photo }}" />
-                   </span>
+            {{ with .Params.author }}
+              {{ with index site.Data.authors . }}
+          by <span class="p-author h-card"><a href="{{ .link }}">{{ .name }}</a>
+          <img class="u-photo" style="display: none;" src="{{ .photo }}" />
+          </span>
+              {{ end }}
             {{ end }}
         </p>
        </article>
4

Hah. You were right one of my example posts was missing author. I’ve updated my code to account for that like you suggest. Thanks!!!

5

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