How to select array element by element property

support
1

I’ve spent an hour trying to do something so simple and need help, thank you in advance.

Given this Data file.

data/eleders.yml

elders:
  - elder_id: steve
    name: Steve Smith

  - elder_id: john
    name: John Smith

In my template, where .Params.elder_id = “steve”

{{ $elder := index .Site.Data.elders .Params.elder_id  }}

$elder contains the entire array and not the expected single map object with elder_id = “steve”.

map[elders:[map[elder_id:steve name:Steve Smith] map[elder_id:john name:John Smith]]]

Can someone please help me understand how to select an array element (object) by key?

Thank you so much,

Karl

2

It finally came to me that this was an array of maps.

I’m using range first 1 to access the array and I know it will only return one array map.

{{ define "main" }}
{{ $data := index .Site.Data.elders }}
<section class="container bg-containerBackground py-5 prose md:prose-md px-3">
    {{ range first 1 (where $data.elders "id" .Params.elder_id) }}
    <p>{{ .id }}</p>
    {{ end }}
</section>
{{ end }}

Hope this helps someone.

Hugo newbie…

3

Also note that the data file is the highest level object. Currently you have to use .Site.Data.elders.elders to get to the data. Do this instead:

data/elders.yml

- elder_id: steve
  name: Steve Smith
- elder_id: john
  name: John Smith

Also note that using elder_id in a data file named elders is redundant. Simplify:

- id: steve
  name: Steve Smith
- id: john
  name: John Smith
4 Likes
4

Thank you for the tip! Learning more every day!

1 Like
5

Further improvement

data/elders.yml

- id: steve
  name: Steve Smith

- id: john
  name: John Smith
  • $allElders - the Data file elders.yml array
  • $elders - is a single element array of a map
  • $elder - is the map of the desired elder element. Defining a variable at the top of the template provides access to the data within the template.
  • .Params.elder_id - page variable that contains the elder_id for this chapter.

Note: this reason for the separate elder.yml file is that elder data is read from multiple pages and partial templates and I wanted to keep all elder data in a single file because the end-users will be using Forestry.IO to edit their site content and data files.

{{ define "main" }}
{{ $allElders := index .Site.Data.elders }}
{{ $elders := where $allElders "id" .Params.elder_id }}
{{ $elder := index $elders 0 }}

 <section class="container bg-containerBackground py-5 prose md:prose-md px-3">
     <p>{{ $elder.id }}</p>
 </section>
 {{ end }}

Hope this helps someone, I’m learning a lot today!

Karl

6

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