Data Template in Shortcode Param

support
1

Kia ora,

I am creating a shortcode that aims to render data templates into a more complex HTML layout (homework.html).

What I want to be able to do is to pass a data template file as a parameter to this shortcode, like this:

{{< homework file="$.Site.Data.11sci.as90940.homework" >}}

But I bump into the error:

Error: Error building site: “/Users/finnlesueur/Git/science.lesueur.nz/content/12ess/as91191/homework.md:7:1”: failed to render shortcode “homework”: failed to process shortcode: “/Users/finnlesueur/Git/science.lesueur.nz/themes/hugo-spartan/layouts/shortcodes/homework.html:7:21”: execute of template failed: template: shortcodes/homework.html:7:21: executing “shortcodes/homework.html” at <$homework.topics>: can’t evaluate field topics in type string

This error occurs here:

{{ $homework := .Get "file" }}
<div class="toc">
   <h2>Topics</h2>
   <ol>
   {{ range $homework.topics }}
      <li><a href="#{{ . | urlize }}" title="Jump to {{ . }}">{{ . }}</a></li>
   {{ end }}
   </ol>
</div>

I get that this means it is being evaluated as a string, not as a data template. My question is how do I evaluate it as a data template?

Thanks!

1 Like
2

That does not work. But you can pass the key to the element you need, e.g:

{{< homework file="11sci.as90940.homework" >}}

And then in your shortcode:

{{ $homework := .Get "file" }}
{{ $data := index site.Data $homework }}

I think the above or a variation of the above should work (untested, just typed it in here)

1 Like
3

Ah @bep, that does make total sense. I wasn’t aware index could do that.
I do bump into this error, however:

Error: Error building site: “/Users/finnlesueur/Git/science.lesueur.nz/content/11sci/as90940/homework.md:7:1”: failed to render shortcode “homework”: failed to process shortcode: “/Users/finnlesueur/Git/science.lesueur.nz/themes/hugo-spartan/layouts/shortcodes/homework.html:2:16”: execute of template failed: template: shortcodes/homework.html:2:16: executing “shortcodes/homework.html” at <index .Site.Data $key>: error calling index: value is nil; should be of type string

{{ $key := .Get "key" }}
{{ $homework := index .Site.Data $key }}

I have verified that $key is the correct string, and I have verified that .Site.Data returns the proper map, with the proper structure. For some reason that index call is returning nil.

Any thoughts?

4

It’s easier to help if we can replicate your issue.

Try to add a with or an if block testing for the presence of key before using it in the index statement.

5

Hm, I think it is an issue with the nested key.

{{< homework file="11sci" >}} gives a map
{{< homework file="11sci.as90940" >}} gives nil
{{< homework file="11sci.as90940.homework" >}} also gives nil

Screen Shot 2020-11-19 at 1.30.34 PM

6

Ah, I can avoid the nested key by doing this:

{{< homework year="11sci" unit="as90940" >}}

{{ $year := .Get "year" }}
{{ $unit := .Get "unit" }}

{{ $homework := (index (index .Site.Data $year) $unit).homework }}

Seems to work :slight_smile: If there is a solution with nested keys that would be much nicer though!

7

So you want to split a string at each .? :wink:

{{ $values := split "11sci.as90940.homework" "." }}
{{ range $values }}
{{ . }}
{{ end }}
8

Sorry - I’m not sure how your answer helps me used a nested key with the index function.

9

Something like:

{{ $data := site.Data }}
{{ $keys := split (.Get "keys") "." }}

{{ range seq (len $keys) }}
    $data = {{ index $data (index $keys (sub . 1)) }} <br>

    {{ $data = index $data (index $keys (sub . 1)) }}
{{ end }}
<br>
result = {{ $data }}

{{< test keys="one.two.three" >}}

# /data/one/two/three.toml
foo = "bar"

will result in:

$data = map[two:map[three:map[foo:bar]]]
$data = map[three:map[foo:bar]]
$data = map[foo:bar]

result = map[foo:bar]
10

This thread went long really fast. OK, my memory may be slightly off. Maybe we had plans to add support for “.” keys in index func … @moorereason ?

11
12

OK, now I remember. This probably also ties into the “vararg discussion”.