# How can I make a variable that has a filtered set of the volume group facts?

**URL:** <https://forum.ansible.com/t/how-can-i-make-a-variable-that-has-a-filtered-set-of-the-volume-group-facts/8777>\
**Category:** Get Help\
**Created:** [September 25, 2024, 11:40pm UTC](https://forum.ansible.com/t/how-can-i-make-a-variable-that-has-a-filtered-set-of-the-volume-group-facts/8777 "2024-09-25T23:40:56Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![lightnb](https://avatars.discourse-cdn.com/v4/letter/l/e274bd/32.png) [@lightnb](https://forum.ansible.com/u/lightnb)\
**Post date:** [September 25, 2024, 11:40pm UTC](https://forum.ansible.com/t/how-can-i-make-a-variable-that-has-a-filtered-set-of-the-volume-group-facts/8777/1 "2024-09-25T23:40:56Z")

</div>

When I print `ansible_facts.lvm.vgs`, I get:

```auto
    vg_lago:
      free_g: '558.08'
      num_lvs: '5'
      num_pvs: '1'
      size_g: '1861.85'
    vg_mirror:
      free_g: '0'
      num_lvs: '1'
      num_pvs: '1'
      size_g: '9313.87'
    vg_picasso:
      free_g: '0'
      num_lvs: '4'
      num_pvs: '1'
      size_g: '39104.61'
    vg_vincent:
      free_g: '484.13'
      num_lvs: '10'
      num_pvs: '1'
      size_g: '926.38'

```

I want to create a new variable in the playbook that is the same as above, but with volume groups having free space equal to zero filtered out.

Thus, the desired result is to create a variable:

```auto
vars:    
    VolumeGroupsWithFreeSpace: []

```

That contains only:

```auto
    vg_lago:
      free_g: '558.08'
      num_lvs: '5'
      num_pvs: '1'
      size_g: '1861.85'
    vg_vincent:
      free_g: '484.13'
      num_lvs: '10'
      num_pvs: '1'
      size_g: '926.38'

```

I tried using:

```auto
"{{ ansible_facts.lvm.vgs | selectattr('free_g', 'equalto', '0') | list }}"

```

But this doesn’t seem to work, it complains that ‘free\_g’ is an undefined property.

I’m not sure that `selectattr` can use a multi-dimensional property to filter on, and if it can, I can’t find the syntax for it.

Maybe it’s possible with a loop, so I started trying this:

```auto
- name: "Build a list of volume groups where free space is > 0."
      set_fact:
        VolumeGroupsWithFreeSpace: "{{ VolumeGroupsWithFreeSpace }} + ['{{ item.free_g }}']"
      with_items: "{{ ansible_facts.lvm.vgs }}"

```

But this also complains:

```auto
'ansible.utils.unsafe_proxy.AnsibleUnsafeText object' has no attribute 'free_g'

```

How can I make a **variable** that has a filtered set of the volume group facts?

---

<div class="post-metadata">

**Author:** ![lightnb](https://avatars.discourse-cdn.com/v4/letter/l/e274bd/32.png) [@lightnb](https://forum.ansible.com/u/lightnb)\
**Post date:** [September 26, 2024, 12:12am UTC](https://forum.ansible.com/t/how-can-i-make-a-variable-that-has-a-filtered-set-of-the-volume-group-facts/8777/2 "2024-09-26T00:12:54Z")

</div>

I think I’m close to an answer, but it’s not quite right:

```auto
---
- hosts: all
  become: true

  vars:    
    VolumeGroupsWithFreeSpace: []

  tasks:
    - name: "Print raw facts"
      debug:
        msg: "{{ ansible_facts.lvm.vgs }}"

    - name: Filter out full volume groups
      set_fact:        
        VolumeGroupsWithFreeSpace: "{{ VolumeGroupsWithFreeSpace }} + ['{{ item }}']"
      when: "{{ (item.value.free_g | int) > 0 }}"
      loop: "{{ ansible_facts.lvm.vgs | dict2items }}"

    - name: Print VolumeGroupsWithFreeSpace.
      debug:
        msg: "{{ VolumeGroupsWithFreeSpace }}"

```

The output looks like:

```auto
msg: '[] + [''{''key'': ''vg_lago'', ''value'': {''size_g'': ''1861.85'', ''free_g'': ''558.08'', ''num_lvs'': ''5'', ''num_pvs'': ''1''}}''] + [''{''key'': ''vg_vincent'', ''value'': {''size_g'': ''926.38'', ''free_g'': ''484.13'', ''num_lvs'': ''10'', ''num_pvs'': ''1''}}'']'

```

So the filtering is working, it’s just storing it in a weird format. I think the issue is I don’t know how to add an element to an array.