Helm template not able to read ip address - can't evaluate field ipAddress in type string-CodePudding

I am trying to create a helm template for Istio's ServiceEntry which has a list of addresses for static ip addresses. In values.yaml, I have

- name: test-se
  namespace: test-se-ns
  egressUrls: 
  - mydbhost.com
  port: 32306
  protocol: TCP
  ipAddress: 10.2.2.2

In the .tpl file I am trying to add the value of ipAddress to a list

  {{- with .ipAddress }}
  addresses: 
  - {{ .ipAddress | quote }}
  {{- end }}

Always fails with exception

templates/_service_entry.tpl:18:13: executing "common.serviceentry.tpl" at <.ipAddress>: can't evaluate field ipAddress in type string

Any idea what I am doing wrong?

CodePudding user response：

when you use with in Helm, you change the scope of the ., so Helm looks for an object and not a string, you can read more about it in the docs.

but anyway, I think that in your case, you need to use range instead of with, you can see an example here

CodePudding user response：

If you use with you make the thing that you have used as with the context inside that block.

So, use the dot to refer to it.

{{- with .ipAddress }}
addresses: 
  - {{ . | quote }}
{{- end }}

From the docs:

{{with pipeline}} T1 {{end}}
    If the value of the pipeline is empty, no output is generated;
    otherwise, dot is set to the value of the pipeline and T1 is
    executed.

In this case, an if seems also fitting, since you do not much with the new context.

{{- if .ipAddress }}
addresses: 
  - {{ .ipAddress | quote }}
{{- end }}