Below is my case:
{{- $v := (.Files.Get "values-productpage.yaml") | fromYaml }}.
spec:
{{- range $key, $value := $v.containers }}
containers:
- name: {{ $value.name }}
image: {{.Values.productpage_image}}:latestHere when reaching .Values.productpage_image, it reports: can't evaluate field productpage_image in type interface {}.
Is there any usage error here? Why can I not use .Values.xxx in this loop? If I move the .Values to the first line, there is no error.
You can simply use $ to get to the root scope
Without defining what $root is, you can references .Values as $.Values from within a loop, or any other scope.
It's because range changes a scope (see detailed description here https://github.com/helm/helm/blob/master/docs/chart_template_guide/control_structures.md#looping-with-the-range-action).
You can assign .Values.productpage_image to the variable outside the range and use inside.
As @abinet explained properly about the reason, I'll share my solution for that( which helped me a lot, and I hope that will save you time):
First, I saved the scope:{{- $root := . -}}
and after that , I called the .Value inside the loop context like this:{{ $root.Values.data }}
so basically , you code should be look like:
{{- $root := . -}}
{{- $v := (.Files.Get "values-productpage.yaml") | fromYaml }}.
spec:
{{- range $key, $value := $v.containers }}
containers:
- name: {{ $value.name }}
image: {{$root.Values.productpage_image}}:latest