Ansible combine list of items in single list - json

Question

There is probably simple solution to this i just cant figure it out.
I got the following list in Ansible:
result: [
{
"name": "DC1",
"region": "EU",
"net": "10.10.1.0"
},
{
"name": "DC1",
"region": "EU",
"net": "10.10.2.0"
},
{
"name": "DC2",
"region": "NA",
"net": "10.10.3.0"
},
]
and would like to get the new list in this format:
[
{
"name": "DC1",
"region": "EU",
"net": ["10.10.1.0","10.10.2.0"]
},
{
"name": "DC2",
"region": "NA",
"net": "10.10.3.0"
}
]
In the meantime i have also found the solution for the data format expected by Ansible module
- name: Convert items from the input list
set_fact:
list_conv: "{{ list_conv|default([])+ (item | dict2items )}}"
loop: "{{ result }}"
when: item.name == 'DC1'
- name: Create new list
set_fact:
list_final: "{{ list_final|default([]) + [{ item.key: item.value }] }}"
loop: "{{ list_conv | unique }}"
Output then will:
[
{"name": "DC1"},
{"region": "EU"},
{"net": "10.10.1.0"},
{"net": "10.10.2.0"}
]

Answer 1

There are more options.
The simplest option is converting the addresses to the lists
net_lists: "{{ result|json_query('[].{name: name, net: [net]}') }}"
gives
net_lists:
- name: DC1
net: [10.10.1.0]
- name: DC1
net: [10.10.2.0]
- name: DC2
net: [10.10.3.0]
Then, merge the items by name and append the lists
net_list: "{{ [net_lists, []]|
community.general.lists_mergeby('name', list_merge='append') }}"
gives what you want
net_list:
- name: DC1
net: [10.10.1.0, 10.10.2.0]
- name: DC2
net: [10.10.3.0]
Example of a complete playbook for testing
- hosts: localhost
vars:
result:
- name: DC1
net: 10.10.1.0
- name: DC1
net: 10.10.2.0
- name: DC2
net: 10.10.3.0
net_lists: "{{ result|json_query('[].{name: name, net: [net]}') }}"
net_list: "{{ [net_lists, []]|
community.general.lists_mergeby('name', list_merge='append') }}"
tasks:
- debug:
var: net_lists|to_yaml
- debug:
var: net_list|to_yaml
The next option is grouping the items by name, selecting the keys and values, and creating a dictionary. Declare the variables
net_groups: "{{ result|groupby('name') }}"
net_names: "{{ net_groups|map('first')|list }}"
net_lists: "{{ net_groups|map('last')|
map('map', attribute='net')|list }}"
net_dict: "{{ dict(net_names|zip(net_lists)) }}"
net_list: "{{ net_dict|dict2items(key_name='name', value_name='net') }}"
give
net_groups:
- - DC1
- - {name: DC1, net: 10.10.1.0}
- {name: DC1, net: 10.10.2.0}
- - DC2
- - {name: DC2, net: 10.10.3.0}
net_names: [DC1, DC2]
net_lists:
- [10.10.1.0, 10.10.2.0]
- [10.10.3.0]
net_dict:
DC1: [10.10.1.0, 10.10.2.0]
DC2: [10.10.3.0]
net_list:
- name: DC1
net: [10.10.1.0, 10.10.2.0]
- name: DC2
net: [10.10.3.0]
Example of a complete playbook for testing
- hosts: localhost
vars:
result:
- name: DC1
net: 10.10.1.0
- name: DC1
net: 10.10.2.0
- name: DC2
net: 10.10.3.0
net_groups: "{{ result|groupby('name') }}"
net_names: "{{ net_groups|map('first')|list }}"
net_lists: "{{ net_groups|map('last')|
map('map', attribute='net')|list }}"
net_dict: "{{ dict(net_names|zip(net_lists)) }}"
net_list: "{{ net_dict|dict2items(key_name='name', value_name='net') }}"
tasks:
- debug:
var: net_groups|to_yaml
- debug:
var: net_names|to_yaml
- debug:
var: net_lists|to_yaml
- debug:
var: net_dict|to_yaml
- debug:
var: net_list|to_yaml
Q: "How possibly can I generate such a list from my input data?"
- name: DC1
- net: 10.10.1.0
- net: 10.10.2.0
A: There are no filters to produce this structure. You can use Jinja instead. For example,
net_dict2_str: |
{% for k,v in net_dict.items() %}
{{ k }}:
- name: {{ k }}
{% for n in v %}
- net: {{ n }}
{% endfor %}
{% endfor %}
net_dict2: "{{ net_dict2_str|from_yaml }}"
give
net_dict2:
DC1:
- name: DC1
- net: 10.10.1.0
- net: 10.10.2.0
DC2:
- name: DC2
- net: 10.10.3.0
Fit the template to your needs.