Given the following list:
fruits:
- fruit: apple
color: red
texture: crunchy
shape: round
- fruit: grapefruit
color: yellow
taste: sour
- fruit: pear
color: yellow
How would I use the items2dict filter to change to a dictionary (below)? Problem is there is multiple, and a variable amount of values.
"{{ fruits | items2dict(key_name='fruit', value_name='??????') }}
Desired result:
fruits:
- apple:
color: red
texture: crunchy
shape: round
- grapefruit:
color: yellow
taste: sour
- pear:
color: yellow
I can't seem to find how here: https://docs.ansible.com/ansible/latest/user_guide/playbooks_filters.html#transforming-lists-into-dictionaries
The task below does the job
- set_fact:
fruits2: "{{ fruits2|default([]) + [{ item['fruit']: value }]}}"
loop: "{{ fruits }}"
vars:
keys: "{{ item.keys()|difference(['fruit']) }}"
vals: "{{ keys|map('extract', item)|list }}"
value: "{{ dict(keys|zip(vals)) }}"
gives
fruits2:
- apple:
color: red
shape: round
texture: crunchy
- grapefruit:
color: yellow
taste: sour
- pear:
color: yellow
A dictionary, instead of a list, can be created by simply changing the concatenation of the lists to the combination of the dictionaries e.g.
- set_fact:
fruits3: "{{ fruits3|default({})|combine({ item['fruit']: value }) }}"
loop: "{{ fruits }}"
vars:
keys: "{{ item.keys()|difference(['fruit']) }}"
vals: "{{ keys|map('extract', item)|list }}"
value: "{{ dict(keys|zip(vals)) }}"
gives
fruits3:
apple:
color: red
shape: round
texture: crunchy
grapefruit:
color: yellow
taste: sour
pear:
color: yellow
items2dict can be used to select 2 attributes only (key_name and value_name) e.g.
- set_fact:
fruits4: "{{ fruits|items2dict(key_name='fruit', value_name='color') }}"
gives
fruits4:
apple: red
grapefruit: yellow
pear: yellow
A list (desired result) can't be created by items2dict. items2dict returns a dictionary.
items2dict will fail if the attribute is missing e.g.
- set_fact:
fruits5: "{{ fruits|items2dict(key_name='fruit', value_name='taste') }}"
fails
The error was: KeyError: 'taste'