This produces the list you want:
|--- - 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: Extract a list of values of a
field within a list of dictionaries when a key matches another list of
values set_fact: db_used_ports: | {% set ports=[] %} {% for dd0 in
domain_definition %} {% set db_servers_names=dd0.db_servers|default([])
%} {% for dd1 in domain_definition %} {% if dd1['name'] in
db_servers_names %} {% set _ = ports.append(dd1.port) %} {% endif %} {%
endfor %} {% endfor %}{{ ports }}" 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' - name: Show the extracted ports
debug: msg: "{{ db_used_ports }}" |
On 2/5/22 9:56 AM, jean-christophe manciot wrote:
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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