There are 2 issues:.
1. The loop can become costly as the number of entries rise: I have
files with hundreds (potentially thousands) of servers/workstations.
2. it also results in as many answers as the number of entries, although
only one is non empty. I don't know how to set a variable with the single
right answer.
```
- debug:
msg: "{{ item.workstations|
selectattr('name', 'eq', os_name)|
selectattr('revision', 'eq', os_revision)|
map(attribute= 'url')|
list }}"
loop: "{{ domain_definition }}"
when: item.workstations|length > 0
vars:
os_name: ubuntu1
os_revision: '2017-08-16'
```
leads to:
```
ok: [localhost] => (item={'name': 'server01', 'cluster': 'cluster0',
'port': '8070', 'workstations': [{'name': 'name_default', 'revision':
'revision_default', 'url': 'url_default'}]}) => {
"msg": []
}
ok: [localhost] => (item={'name': 'server11', 'cluster': 'cluster1',
'port': '8080', 'workstations': [{'name': 'debian1', 'revision':
'2016-06-21', 'url': 'http://debian1.example.com:9911/2016-06-21'},
{'name': 'ubuntu1', 'revision': '2017-08-16', 'url':
'http://ubuntu1.example.com:9912/2017-08-16'}]}) => {
"msg": [
"http://ubuntu1.example.com:9912/2017-08-16";
]
}
ok: [localhost] => (item={'name': 'server12', 'cluster': 'cluster2',
'port': '8090', 'workstations': [{'name': 'debian2', 'revision':
'2018-04-15', 'url': 'http://debian2.example.com:9921/2018-04-15'},
{'name': 'ubuntu2', 'revision': '2020-01-12', 'url':
'http://ubuntu2.example.com:9922/2020-01-12'}]}) => {
"msg": []
}
```
Isn't there a loopless solution?
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