Helm Chart开发报错：无法在interface{}类型中解析audiences字段

Hey there, let's break down what's going wrong here and get your Helm template working properly.

What's Causing the Error? #

Looking at your values.yaml, the spec.jwtRules field is an array/list (you can spot this from the leading - before issuer: foo). When you try to access .Values.spec.jwtRules.audiences in your template, you're trying to grab an audiences property directly from the array itself—but arrays don't have that field. The audiences list lives inside each individual item within the jwtRules array, not on the array itself.

Solution 1: Handle Your Current Single JWT Rule Case #

Since your values.yaml only has one rule in jwtRules, you can target the first element of the array using index notation [0]:

Update your template's audiences section like this:

jwtRules:
    - issuer: foo
      jwksUri: bar
      forwardOriginalToken: true
      audiences: |-
        {{- range .Values.spec.jwtRules[0].audiences }}
        - {{ . | title | quote }}
        {{ end }}

Solution 2: Build for Scalability (Support Multiple JWT Rules) #

If you might add more rules to jwtRules later, wrap the entire rule block in a range loop to iterate over every item in the array:

jwtRules:
    {{- range $rule := .Values.spec.jwtRules }}
    - issuer: {{ $rule.issuer | default "foo" }}
      jwksUri: {{ $rule.jwksUri | default "bar" }}
      forwardOriginalToken: {{ $rule.forwardOriginalToken | default true }}
      audiences: |-
        {{- range $aud := $rule.audiences }}
        - {{ $aud | title | quote }}
        {{ end }}
    {{- end }}

This way, every rule defined in your values.yaml will be rendered into the final resource, and you'll correctly access each rule's nested audiences list.

Fixing the _helpers.tpl File #

Your helper template has the same root issue—you're trying to access audiences directly from the array. Update it to iterate over each rule first:

{{/* vim: set filetype=mustache: */}}
{{- define "jwtRules.audiences" -}}
{{- range $rule := $.Values.spec.jwtRules }}
audiences:
  {{- range $aud := $rule.audiences }}
  - {{ $aud | quote }}
  {{- end }}
{{- end }}
{{- end }}

Quick Recap #

Always double-check if a field in values.yaml is an array (starts with -) or a single object. For arrays, you need to either target a specific index (like [0] for the first item) or loop through all items with range before accessing nested fields.

内容的提问来源于stack exchange，提问作者sype