{{ If }} clause inside of range scope doesn't see values - kubernetes

Question

The task is to range over workers collection and if the current worker has autoscaling.enabled=true create an hpa for it.
I've tried to compare .autoscaling.enabled to "true" but it returned "error calling eq: incompatible types for comparison". Here people say that it actually means that .autoscaling.enabled is nil. So {{ if .autoscaling.enabled }} somehow doesn't see the variable and assumes it doesn't exist.
Values:
...
workers:
- name: worker1
command: somecommand1
memoryRequest: 500Mi
memoryLimit: 1400Mi
cpuRequest: 50m
cpuLimit: 150m
autoscaling:
enabled: false
- name: worker2
command: somecommand2
memoryRequest: 512Mi
memoryLimit: 1300Mi
cpuRequest: 50m
cpuLimit: 150m
autoscaling:
enabled: false
- name: workerWithAutoscaling
command: somecommand3
memoryRequest: 600Mi
memoryLimit: 2048Mi
cpuRequest: 150m
cpuLimit: 400m
autoscaling:
enabled: true
minReplicas: 1
maxReplicas: 5
targetCPUUtilization: 50
targetMemoryUtilization: 50
...
template:
...
{{- range .Values.workers }}
{{- if .autoscaling.enabled }}
apiVersion: autoscaling/v2beta1
kind: HorizontalPodAutoscaler
metadata:
labels:
...
name: "hpa-{{ .name }}-{{ $.Realeas.Name }}"
spec:
scaleTargetRef:
apiVersion: apps/v1
kind: Deployment
name: {{ .name }}
minReplicas: {{ .minReplicas }}
maxReplicas: {{ .maxReplicas }}
metrics:
{{- with .targetCPUUtilization}}
- type: Resource
resource:
name: cpu
targetAverageUtilization: {{ . }}
{{- end }}
{{- with .targetMemoryUtilization}}
- type: Resource
resource:
name: memory
targetAverageUtilization: {{ . }}
{{- end }}
---
{{- end }}
{{- end }}
I expect the manifest for one hpa that targets workerWithAutoscaling, but the actual output is totally empty.

Answer 1

Your use of {{- range .Values.workers }} and {{- if .autoscaling.enabled }} is fine. You are not getting any values because .minReplicas, .maxReplicas, etc, are inside .autoscaling scope.
See Modifying scope using with
Adding {{- with .autoscaling}} will solve the issue.
{{- range .Values.workers }}
{{- if .autoscaling.enabled }}
apiVersion: autoscaling/v2beta1
kind: HorizontalPodAutoscaler
metadata:
labels:
name: "hpa-{{ .name }}-{{ $.Release.Name }}"
spec:
scaleTargetRef:
apiVersion: apps/v1
kind: Deployment
name: {{ .name }}
{{- with .autoscaling}}
minReplicas: {{ .minReplicas }}
maxReplicas: {{ .maxReplicas }}
metrics:
- type: Resource
resource:
name: cpu
targetAverageUtilization: {{ .targetCPUUtilization}}
- type: Resource
resource:
name: memory
targetAverageUtilization: {{ .targetMemoryUtilization}}
{{- end }}
{{- end }}
{{- end }}
helm template .
---
# Source: templates/hpa.yaml
apiVersion: autoscaling/v2beta1
kind: HorizontalPodAutoscaler
metadata:
labels:
name: "hpa-workerWithAutoscaling-release-name"
spec:
scaleTargetRef:
apiVersion: apps/v1
kind: Deployment
name: workerWithAutoscaling
minReplicas: 1
maxReplicas: 5
metrics:
- type: Resource
resource:
name: cpu
targetAverageUtilization: 50
- type: Resource
resource:
name: memory
targetAverageUtilization: 50