Helm charts nested loops - templates

Question

Trying to generate deployments for my helm charts by using this template
{{- range .Values.services }}
apiVersion: apps/v1beta1
kind: Deployment
metadata:
name: myapp-{{ . }}
spec:
replicas: {{ .replicaCount }}
template:
metadata:
labels:
app: myapp-{{ . }}
chart: myapp-{{ $.Values.cluster }}-{{ $.Values.environment }}
spec:
containers:
- name: myapp-{{ . }}
image: {{ $.Values.containerRegistry }}/myapp-{{ . }}:latest
ports:
- containerPort: {{ .targetPort }}
env:
{{- with .environmentVariables }}
{{ indent 10 }}
{{- end }}
imagePullSecrets:
- name: myregistry
{{- end }}
for 2 of my services. In values.yaml I got
environment: dev
cluster: sandbox
ingress:
enabled: true
containerRegistry: myapp.io
services:
- backend:
port: 80
targetPort: 8080
replicaCount: 1
environmentVariables:
- name: SOME_VAR
value: "hello"
- web:
port: 80
targetPort: 8080
replicaCount: 1
environmentVariables:
- name: SOME_VAR
value: "hello"
... but the output is not being properly formatted
apiVersion: apps/v1beta1
kind: Deployment
metadata:
name: myapp-map[backend:map[replicaCount:1 targetPort:8080 environmentVariables:[map[name:SOME_VAR value:hello] port:80]]
instead of
apiVersion: apps/v1beta1
kind: Deployment
metadata:
name: myapp-web
(...)
and another config
apiVersion: apps/v1beta1
kind: Deployment
metadata:
name: myapp-backend
(...)
what functions can I use or some different data structure? None of the references (i.e. .environmentVariables are working correctly)

Answer 1

I think you should reconsider the way the data is structured, this would work better:
services:
- name: backend
settings:
port: 80
targetPort: 8080
replicaCount: 1
environmentVariables:
- name: SOME_VAR
value: "hello"
- name: web
settings:
port: 80
targetPort: 8080
replicaCount: 1
environmentVariables:
- name: SOME_VAR
value: "hello"
And your Deployment to look like this:
{{- range .Values.services }}
---
apiVersion: apps/v1beta1
kind: Deployment
metadata:
name: myapp-{{ .name }}
spec:
replicas: {{ .settings.replicaCount }}
template:
metadata:
labels:
app: myapp-{{ .name }}
spec:
containers:
- name: myapp-{{ .name }}
image: {{ $.Values.containerRegistry }}/myapp-{{ .name }}:latest
ports:
- containerPort: {{ .settings.targetPort }}
env:
{{- with .settings.environmentVariables }}
{{ toYaml . | trim | indent 6 }}
{{- end }}
imagePullSecrets:
- name: myregistry
{{- end }}
would actually create two deployments, by adding the --- separator.