Use range to get specific entry out of YAML datafile

support
1

Problem: I want to create a table for each post whose contents changes for each post. The relevant data is in a YAML file located in /data/mydata.yaml. The table will be constructed using a shortcode.

Here is the data, for example:

- 01:
  category1
    - item1
    - item 2
  category2
    - item 1
    - item 2
    - item 3
- 02
  category1
    - item1
    - item 2
  category2
    - item 1
    - item 2
    - item 3

My shortcode works like so

{{< myshortcode "01" >}}

What I want to do is range over the category values only for the data set passed through the shortcode, the ‘01’ or ‘02’ or ‘03’… etc.

Now I know to write something like the following:

{{ range .Site.Data.mydata }}

I’ve tried different things, but I cannot get it to return me only the data I want, so that I can range over .category1 and .category2, like so

{{ range .category1}}
  {{ . }}
{{ end }}

Thanks for any help.

2

Your data sample is not valid yaml, and I don’t know if this is a typo. I don’t know what your actual data looks like.

Assuming you meant something like this:

- 01:
    category1:
    - item 1
    - item 2
    category2:
    - item 1
    - item 2
    - item 3
- 02:
    category1:
    - item 1
    - item 2
    category2:
    - item 1
    - item 2
    - item 3

you need to do something like this:

{{ range $data }}
  {{ range $k1, $v1 := . }}
    {{ if eq $k1 "1" }}
      <h2>{{$k1}}</h2>
      {{ range $k2, $v2 := $v1 }}
        {{ $k2 }}: {{ $v2 }}
        <br>
      {{ end }}
    {{ end }}
  {{ end }}
{{ end }}

Which, given my assumed data, will output this:

1
category1: [item 1 item 2]
category2: [item 1 item 2 item 3]
4

Thanks for the advice. It’s inching me where I want to go.

5

Edit 3: Decided to trim leading “0” instead and stick with int.

Edit 2: Updated the code a little. Changed from int to string for purpose of comparison due to the way Hugo int deals with numbers that have a ‘0’ in front of them (treating them as octals).

Edit: Oh yeah… thanks!

So it appears to be working. You were right about the datafile.

Here is what is working for me (the $match math is due to $k1 being out of sync):

{{ $documentnumber := int (( .Get 0) | string.TrimLeft "0" ) }}
{{ range $k1, $v1 := .Site.Data.mydata }}
  {{ $match := (add $k1 1) }}
  {{ if eq $match $documentnumber }}
    <table>
    {{ range .category1 }}
      <tr>
        <td>{{.}}</td>
      </tr>
    {{ end }}
    </table>
  {{ end}}
{{ end }}