Arrays in Ansible - arrays

Question

I have a json like below
{
"nodes":[
{
"node_values":[
"[test1]",
"10.33.11.189",
"10.33.11.185"
]
},
{
"node_values":[
"[test2]",
"10.33.11.189",
"10.33.11.185"
]
}
]
}
I am trying to read only the node values and put it in the text files. I am using below ansible code
hosts: localhost
vars:
tmpdata1: "{{ lookup('file','test.json')|from_json }}"
tasks:
- name: Add mappings to /etc/hosts
blockinfile:
path: /home/s57232/Ansible-Install/Install_Inventory.txt
content: item
marker: "# {mark} ANSIBLE MANAGED BLOCK {{ item.node_values[0] }}"
loop: "{{ tmpdata1 |json_query('nodes[*].node_values[*]') }}"
i am getting below error
**TASK [Add mappings to /etc/hosts] **********************************************************************************************************************************
fatal: [localhost]: FAILED! => {"msg": "The task includes an option with an undefined variable. The error was: 'list object' has no attribute 'node_values'\n\nThe error appears to have been in '/home/s57232/Ansible-Install/prepare_inventory.yml': line 14, column 7, but may\nbe elsewhere in the file depending on the exact syntax problem.\n\nThe offending line appears to be:\n\n\n - name: Add mappings to /etc/hosts\n ^ here\n"}**
When i am trying to read with with items and file format with out the blockinfile, if the same IP is there in multiple places, it is not writing, because it is looking for unique values. I am not able to proceed further. Can anyone please help me?
when i am using
- name: Add mappings to /etc/hosts
blockinfile:
path: /home/s57232/Ansible-Install/Install_Inventory.txt
content: "{{ item.node_values }}"
marker: "# {mark} ANSIBLE MANAGED BLOCK {{ item.node_values[0] }}"
loop: "{{ tmpdata1 |json_query('nodes[*]') }}"
I am getting
# BEGIN ANSIBLE MANAGED BLOCK [test1]
['[test1]', '10.33.11.189', '10.33.11.185']
# END ANSIBLE MANAGED BLOCK [test1]
# BEGIN ANSIBLE MANAGED BLOCK [test2]
['[test2]', '10.33.11.189', '10.33.11.185']
# END ANSIBLE MANAGED BLOCK [test2]
my expectation is
# BEGIN ANSIBLE MANAGED BLOCK [test1]
[test1]
10.33.11.189
10.33.11.185
# END ANSIBLE MANAGED BLOCK [test1]
# BEGIN ANSIBLE MANAGED BLOCK [test2]
[test2]
10.33.11.189
10.33.11.185
# END ANSIBLE MANAGED BLOCK [test2]

Answer 1

Here you are:
- name: Add mappings to /etc/hosts
blockinfile:
path: /home/s57232/Ansible-Install/Install_Inventory.txt
content: "{{ item.node_values | join('\n') }}"
marker: "# {mark} ANSIBLE MANAGED BLOCK {{ item.node_values.0 }}"
loop: "{{ tmpdata1.nodes }}"
You don't need to use JMESPath unless you wanted to filter some values. Other than that, you have two lists: one to loop over, the other to join the elements with a newline character.