ansible - list with item index as hash - list

Question

I'm trying to add list element index as hash, preferably without using with_indexed_items because result is to be filtered later.
I'd like to convert this:
vmware_disks:
- datastore: "datastores0"
size_gb: 24
- datastore: "datastores0"
size_gb: 397
storage_policy: "vSAN standard cluster RAID-1"
to something like this:
vmware_disks:
- datastore: "datastores0"
size_gb: 24
nr: 0
- datastore: "datastores0"
size_gb: 397
storage_policy: "vSAN standard cluster RAID-1"
nr: 1
So far I was able to:
using "{{ vmware_disks | zip(range(0,2)) }}"
[
{
"datastore": "datastores0",
"size_gb": 24
},
0
],
[
{
"datastore": "datastores0",
"size_gb": 397,
"storage_policy": "vSAN standard cluster RAID-1"
},
1
]
"{{ vmware_disks | map('combine', {'nr':0}) }}"
[
{
"datastore": "datastores0",
"nr": 0,
"size_gb": 24
},
{
"datastore": "datastores0",
"nr": 0,
"size_gb": 397,
"storage_policy": "vSAN standard cluster RAID-1"
}
]
Please help me to combine both to get desired result.

Answer 1

You can use a set_fact to create another dictionary and add the index in:
- set_fact:
indexed_vmware_disks: >-
{{
indexed_vmware_disks | default([])
+ [ item | combine( { 'nr': index } ) ]
}}
loop: "{{ vmware_disks }}"
loop_control:
index_var: index
Then if you really need the dictionary to have the exact name it had before, you can just reassign it in another set_fact.
So an example playbook:
- hosts: all
gather_facts: no
vars:
vmware_disks:
- datastore: "datastores0"
size_gb: 24
- datastore: "datastores0"
size_gb: 397
storage_policy: "vSAN standard cluster RAID-1"
tasks:
- set_fact:
indexed_vmware_disks: >-
{{
indexed_vmware_disks | default([])
+ [ item | combine( { 'nr': index } ) ]
}}
loop: "{{ vmware_disks }}"
loop_control:
index_var: index
- set_fact:
vmware_disks: "{{ indexed_vmware_disks }}"
- debug:
var: vmware_disks
Would yield the recap:
PLAY [all] *******************************************************************************************************
TASK [set_fact] **************************************************************************************************
ok: [localhost] => (item={'datastore': 'datastores0', 'size_gb': 24})
ok: [localhost] => (item={'datastore': 'datastores0', 'size_gb': 397, 'storage_policy': 'vSAN standard cluster RAID-1'})
TASK [set_fact] **************************************************************************************************
ok: [localhost]
TASK [debug] *****************************************************************************************************
ok: [localhost] =>
vmware_disks:
- datastore: datastores0
nr: 0
size_gb: 24
- datastore: datastores0
nr: 1
size_gb: 397
storage_policy: vSAN standard cluster RAID-1
PLAY RECAP *******************************************************************************************************
localhost : ok=3 changed=0 unreachable=0 failed=0 skipped=0 rescued=0 ignored=0