helm append variable in a loop [duplicate] - kubernetes

Question

I have the function:
{{- define "myapp.getSubKey" -}}
{{- $map := .source }}
{{ "Before: " }}{{ $map }}
{{- range $key, $value := .keys }}
{{- if kindIs "int" $value }}
{{- $map := index $map (int $value) }}
{{ "After: " }}{{ $map }}
{{- end }}
{{- end }}
{{ $map }}
{{- end }}
I call it with include "myapp.getSubKey" (dict "source" .Values.vars "keys" list(0))
This prints out:
Before: [map[name:MYSQL_ROOT_PASSWORD valueFrom:map[secretKeyRef:map[key:db-pass name:db-creds]]] map[name:MYSQL_ROOT_USER valueFrom:map[secretKeyRef:map[key:db-user name:db-creds]]]]
After: [map[name:MYSQL_ROOT_PASSWORD valueFrom:map[secretKeyRef:map[key:db-pass name:db-creds]]]
[map[name:MYSQL_ROOT_PASSWORD valueFrom:map[secretKeyRef:map[key:db-pass name:db-creds]]] map[name:MYSQL_ROOT_USER valueFrom:map[secretKeyRef:map[key:db-user name:db-creds]]]]
So you can see it correctly navigates down and changes $map within the if statement, but when it exits the loop, it goes back to what it was before the loop.
How do I change the "global" value?

Answer 1

Try using the operator = instead of assignment operator := in the inner if-block. When you assigned the $map with :=, the scope is limited only to the if-block.
{{- define "myapp.getSubKey" -}}
{{- $map := .source }}
{{ "Before: " }}{{ $map }}
{{- range $key, $value := .keys }}
{{- if kindIs "int" $value }}
{{- $map = index $map (int $value) }} // <------- here
{{ "After: " }}{{ $map }}
{{- end }}
{{- end }}
{{ $map }}
{{- end }}
The operator = is supported since helm v2.13.0.