Ansible if nested value doesn't exist in nested array - ansible-facts

Question

I'd like to make my Ansible EIP creation idempotent. In order to do that I only want the task to run when Tag "Name" value "tag_1" doesn't exist.
However I'm not sure how I could add this as a 'when' at the end of a task.
"eip_facts.addresses": [
{
"allocation_id": "eipalloc-blablah1",
"domain": "vpc",
"public_ip": "11.11.11.11",
"tags": {
"Name": "tag_1",
}
},
{
"allocation_id": "eipalloc-blablah2",
"domain": "vpc",
"public_ip": "22.22.22.22",
"tags": {
"Name": "tag_2",
}
},
{
"allocation_id": "eipalloc-blablah3",
"domain": "vpc",
"public_ip": "33.33.33.33",
"tags": {
"Name": "tag_3",
}
}
]
(Tags are added later) I'm looking for something like:
- name: create elastic ip
ec2_eip:
region: eu-west-1
in_vpc: yes
when: eip_facts.addresses[].tags.Name = "tag_1" is not defined
What is the correct method of achieving this? Bear in mind the value can not exist in that parameter in the entire array, not just a single iteration.

Answer 1

Ok, I found a semi-decent solution
- name: Get list of EIP Name Tags
set_fact:
eip_facts_Name_tag: "{{ eip_facts.addresses | map(attribute='tags.Name') | list }}"
Which extracts the Name tag and puts them into an array
ok: [localhost] => {
"msg": [
"tag_1",
"tag_2",
"tag_3"
]
}
and then...
- debug:
msg: "Hello"
when: '"tag_1" in "{{ eip_facts_Name_tag }}"'
This will work, beware though, this doesn't do an exact string search. So if you did a search for just 'tag' that'd count as a hit too.