Ansible array manipulation

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1

I’m having an issue adding an element to an array. What i need to do is…

  1. get an array list of IDs from an api using the uri module (no issues here)
  2. add an element to this array (issue here!)
  3. send a PUT with the updated array using uri (no issues here)

====tasks start====

  • name: get data from endpoint 1
    uri: url=https://someapi.com/endpoint1.json method=GET HEADER_api_key=“xxxxxxxxxxxx”
    register: reg_endpoint1

  • name: get data from endpoint 2
    uri: url=https://someapi.com/endpoint2.json method=GET HEADER_api_key=“xxxxxxxxxxxx”
    register: reg_endpoint2

  • name: make an array element from id from endpoint 1, then add this to endpoint 2 array, save as updated_array
    set_fact: updated_array=“{{ reg_endpoint2.json.array_with_many_elements }} + [ {{ reg_endpoint1.json.id_list[0].id }} ]”

  • name: put data with updated_array
    uri:
    method=PUT
    url=https://someapi.com/endpoint3.json
    HEADER_api_key=“xxxxxxxxxxxx”
    HEADER_Content-Type=“application/json”
    body={{ lookup(‘template’,‘/full/path/to/file.json.j2’) }}

====tasks end====

====/full/path/to/file.json.j2====

‘{
“something1”: {
“otherthing2”: {
“thatotherthing3”: {{ updated_array }}
}
}
}’

2

This isn’t tested, but I believe it would look something like:

“{{ reg_endpoint2.json.array_with_many_elements + [reg_endpoint1.json.id_list[0].id] }}”

You need to perform the concatenation inside of a single {{ }}

3

Thank you so much. It’s been hard trying to find any documentation on this. Any links to good docs about this topic? I feel like I’ll be playing around a lot with json, arrays, and uri module in Ansible.

I own you a beer! Next time you visit SF.

4

The best link for jinja2 template docs is: http://jinja.pocoo.org/docs/dev/templates/

Other than that, it’s a little bit of python, a little bit of jinja2 and some other filters and such added by ansible.

In this specific case: http://jinja.pocoo.org/docs/dev/templates/#math

“+ Adds two objects together. Usually the objects are numbers, but if both are strings or lists, you can concatenate them this way”

Anything that happens inside of {{ }} or {% %} is jinja2, outside of those, it’s just text, and not evaluated.

5

Thanks. I need to brush up on my jinjansiblethon.