Hello,
I’ve got a list variable that looks like this
list:
- name: n1
group: g1 - name: n2
group: g1 - name: c1
group: g2
etc…
in my config file, this should become:
g1: n1,n2
g2: c1
etc…
how can this be done?
* Given the list
_list:
- {group: g1, name: n1}
- {group: g1, name: n2}
- {group: g2, name: c1}
* Use *groupby*
_arr: "{{ _list|groupby('group') }}"
gives
_arr:
- - g1
- - {group: g1, name: n1}
- {group: g1, name: n2}
- - g2
- - {group: g2, name: c1}
* Create lists of keys and values
_keys: "{{ _arr|map('first')|list }}"
_vals: "{{ _arr|map('last')|map('map', attribute='name')|list }}"
gives
_keys:
[g1, g2]
_vals:
- [n1, n2]
- [c1]
* Create the dictionary
_dict: "{{ dict(_keys|zip(_vals)) }}"
gives
_dict:
g1: [n1, n2]
g2: [c1]
Thank you, Vladimir.
It works. Is there any trick to make this with one-liner?
Sure. The one-liner below does the job as well. You're welcome
_dict: "{{ dict(_list|groupby('group')|map('first')|list|
zip(_list|groupby('group')|map('last')|
map('map',
attribute='name')|list))
}}"
Hello,
I’ve got a list variable that looks like this
list:
- name: n1
group: g1- name: n2
group: g1- name: c1
group: g2
etc…in my config file, this should become:
g1: n1,n2
g2: c1
I’m assuming a config file here, so can you render it? The example format he docs on the groupby module comes in handy. https://jinja.palletsprojects.com/en/3.1.x/templates/#jinja-filters.groupby
{% for group, values in (list | groupby(‘group’) %}
{{ group }}:{% for item in value %}{{ item }},{% endfor %}
The template can be fixed
{% for group, values in _list|groupby('group') %}
{{ group }}: {{ values|map(attribute='name')|join(',') }}
{% endfor %}
to get the expected result
g1: n1,n2
g2: c1