how pass a variable as json object key in ansible playbook? - ansible

Question

I am trying to execute the curl command that take a variable as key in json body but the variable is not being replaced by the value due to which getting the 400 error:
tasks:
- name: set source tag
uri:
url: https://****/api/v2/source
method: POST
body:
tags:
"{{ ec2_tag_KubernetesCluster }}": true
"{{ ec2_tag_Environment }}": true
"{{ ec2_tag_aws_autoscaling_groupName }}": true
sourceName: "{{ ec2_tag_hostname }}"
body_format: "json"
headers:
Content-Type: "application/json"
Accept: "application/json"
output:
"changed": false,
"connection": "close",
"content": "{\"status\":{\"result\":\"ERROR\",\"message\":\"invalid tag: {{ ec2_tag_Environment }}\",\"code\":400}}",
"content_length": "91",
"content_type": "application/json",
"date": "Tue, 22 Jun 2021 11:24:33 GMT",
"elapsed": 0,
"invocation": {
"module_args": {
"attributes": null,
"backup": null,
"body": {
"sourceName": "eks-****-2-2a-worker53",
"tags": {
"{{ ec2_tag_Environment }}": true,
"{{ ec2_tag_KubernetesCluster }}": true,
"{{ ec2_tag_aws_autoscaling_groupName }}": true
}
},
"body_format": "json",
"client_cert": null,
"client_key": null,
"content": null,
"creates": null,
"delimiter": null,
"dest": null,
"directory_mode": null,
"follow": false,
"follow_redirects": "safe",
"force": false,
"force_basic_auth": false,
"group": null,
"headers": {
"Accept": "application/json",
as you see the "ec2_tag_hostname" is replace with variable value but 'ec2_tag_Environment', 'ec2_tag_KubernetesCluster' and 'ec2_tag_aws_autoscaling_groupName' is not getting replace as these are key of json object.

Answer 1

YAML does not support dynamic keys in any circumstance that I'm aware of; you will want to move the interpolation up one level in order to achieve what you're after:
body: >-
{{
{
"tags": {
ec2_tag_KubernetesCluster: True,
ec2_tag_Environment: True,
ec2_tag_aws_autoscaling_groupName: True,
},
"sourceName": ec2_tag_hostname,
}
}}
body_format: "json"
That works because unlike yaml, python (and thus jinja2) does support dynamic dict keys