Let's assume the following fictional list of dictionaries:
domain_definition:
- name: server11
cluster: cluster1
db_servers:
- server12
- server21
port: '8080'
- name: server12
cluster: cluster1
db_servers:
- server22
port: '8090'
- name: server13
cluster: cluster1
port: '8091'
- name: server21
cluster: cluster2
db_servers:
- server12
- server22
port: '9080'
- name: server22
cluster: cluster2
port: '9090'
The goal is to list all ports of used 'db_servers', so the expected list
is:
- '8090'
- '9080'
- '9090'
- '8090'
- '9090'
The *constraint* is to use one (some operation is performed for each item)
and only one loop (the list is huge in reality).
The following does not work because selectattr expects a value, not a list
of values:
- name: Extracting a list of values of a field within a list of
dictionaries when a key matches another list of values
hosts:
- localhost
strategy: debug
tasks:
- name: Extracting a list of values of a field within a
list of dictionaries when a key matches another list of values
vars:
domain_definition:
- name: server11
cluster: cluster1
db_servers:
- server12
- server21
port: '8080'
- name: server12
cluster: cluster1
db_servers:
- server22
port: '8090'
- name: server13
cluster: cluster1
port: '8091'
- name: server21
cluster: cluster2
db_servers:
- server12
- server22
port: '9080'
- name: server22
cluster: cluster2
port: '9090'
db_servers_names: "{{ item.db_servers |
default([]) |
list }}"
db_servers_used_ports: "{{ domain_definition |
selectattr('name',
'eq', db_servers_names) |
map(attribute=
'port') |
list }}"
debug:
msg:
- "db_servers_names: {{
db_servers_names }}"
- "db_servers_used_ports: {{
db_servers_used_ports }}"
loop: "{{ domain_definition }}"
Any suggestion?
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