Ansible: delete one route from route table in AWS - ansible

Question

I have a route table in AWS where there is a subnet getting routed to one host for each host. I can setup those routes automatically using this code:
- name: Add route to host container network
ec2_vpc_route_table:
region: region
vpc_id: "vpc-somestring"
purge_subnets: false
purge_routes: false
lookup: id
route_table_id: rtb-somestring
routes:
- dest: "1.2.3.0/24"
instance_id: "i-somestring"
This is fine for creating new hosts automatically. But if I want to remove a host, I want to delete the matching route table entry.
I thought, I could just fetch the route table using ec2_vpc_route_table_info, then take the routes filtered with rejectattr and feed it back to ec2_vpc_route_table, replacing the whole table. But, info gives me this format of routing tables:
"all_routes": [
{
"destination_cidr_block": "1.2.3.0/24",
"gateway_id": null,
"instance_id": "i-somestring",
"instance_owner_id": "1234567890",
"interface_id": "eni-somestring",
"network_interface_id": "eni-somestring",
"origin": "CreateRoute",
"state": "active"
},
{
"destination_cidr_block": "5.5.5.0/21",
"gateway_id": "local",
"instance_id": null,
"interface_id": null,
"network_interface_id": null,
"origin": "CreateRouteTable",
"state": "active"
},
{
"destination_cidr_block": null,
"destination_ipv6_cidr_block": "affe:affe:affe:affe::/56",
"gateway_id": "local",
"instance_id": null,
"interface_id": null,
"network_interface_id": null,
"origin": "CreateRouteTable",
"state": "active"
}
]
However, I can't feed that table to ec2_vpc_route_table, because that module just wants a list looking like this:
[
{
"dest": "1.2.3.0/24",
"instance_id": "i-somestring"
},
{
"dest": "5.5.5.0/21",
"gateway_id": "local
},
{
"dest": "affe:affe:affe:affe::/56",
"gateway_id": "local"
}
]
Why is the output of the info module not in a format that I can feed back to the route_table module? How can I convert the output into a format that I can feed back to the route_table module?
Thanks for any input.

Answer 1

a sample of solution:
- hosts: localhost
gather_facts: false
vars:
all_routes: "{{ lookup('file', 'zson.json') | from_json }}"
tasks:
- name: display json
debug:
var: all_routes
- name: create new json
set_fact:
result: "{{ result | d([]) + [{ 'dest': _block, _key: _gateway }] }}"
vars:
_block: "{{ item.destination_cidr_block if item.destination_cidr_block != None else item.destination_ipv6_cidr_block }}"
_gateway: "{{ item.gateway_id if item.gateway_id != None else item.instance_id }}"
_key: "{{ 'gateway_id' if item.gateway_id != None else 'instance_id' }}"
loop: "{{all_routes }}"
- name: display result
debug:
var: result
result:
ok: [localhost] => {
"result": [
{
"dest": "1.2.3.0/24",
"instance_id": "i-somestring"
},
{
"dest": "5.5.5.0/21",
"gateway_id": "local"
},
{
"dest": "affe:affe:affe:affe::/56",
"gateway_id": "local"
}
]
}