Accessing values of Maps nested in an array

[Kalimero66]

Bonjour,
I'm stuck with a simple problem when trying to use gomplate on Helmfile input and I was wondering if someone can help.
My datasource file is a typical Helmfile input as follow:

environments: 
  envA:
    values: 
    - myMap1:
        k1: v1
        k2: v2
    - myMap2:
        k3: v3
        k4: v4
    - myMap3:
        k5: v3
        k6: v4

Is it possible to access k4 value (.ie v4) in one line ?
I know I could potentially could just convert values into a map of maps instead but there must be a better way with gomplate that I'm just not seeing.

Here are my files if anyone interested.

.gomplate.yaml:

# Put the input files here
datasources: 
  env: 
    url: ./ds.yaml
# Put the template files here
inputFiles:
  - ./in.yaml.gotmpl

ds.yaml:

environments: 
  envA:
    values: 
    - myMap1:
        k1: v1
        k2: v2
    - myMap2:
        k3: v3
        k4: v4
    - myMap3:
        k5: v3
        k6: v4

values is an array of Maps , I guess I need to first find the index of myMap2 in values before accessing k4.
As I have many (30+) Maps under values, I use a nested template to find the index of the map in the array but I find it overkilled (and I haven't to cover any corner case yet). Like I said there must be a better way.

in.yaml.gotmpl:

{{- $findMapIndex := `
{{- $k   := .key -}}
{{- range $idx, $val := .list -}}
  {{- if coll.Has $val $k -}}
    {{- printf "%d" $idx -}}
    {{- break -}}
  {{- end -}}
{{- end -}}
` -}}
{{- $envName     := (index (keys (ds "env").environments)  0) }}
{{- $env         := (index  (ds "env").environments $envName) }}
{{- $values      := (index $env "values") }}
 
{{- $dict := coll.Dict "key" "myMap2" "list" $values }}
{{- $i := conv.ToInt (tpl $findMapIndex $dict) }}
{{ printf "Value for k4 is:  %s" (index $values $i).myMap2.k4 }}

{{- $dict := coll.Dict "key" "myMap1" "list" $values }}
{{- $j := conv.ToInt (tpl $findMapIndex $dict) }}
{{ printf "Value for k1 is:  %s" (index $values $j).myMap1.k1 }}

->  gomplate --config .gomplate.yaml
Value for k4 is:  v4
Value for k1 is:  v1

[Kalimero66]

Anybody ?

[Kalimero66]

well ... no feedback ... closing this topic.

[hairyhenderson]

Sorry for the silence @Kalimero66 - I've been busy with work, and on vacation...

I don't have time to dig too deeply on this, but one suggestion to simplify is to use contexts instead of datasources (i.e. use context:) in your config where you'd use datasources:).

Also instead of using tpl to process a template string inline you might define it with define instead, then render with template or tmpl.Exec. See https://docs.gomplate.ca/syntax/#nested-templates.

Finally, if the main issue is you want to be able to write less verbose templates, you might consider using jq syntax with the coll.JQ function. The tradeoff is (potentially) a template that's less easy to read.