Processing JSON from REST call in Ansible [duplicate] - json

Question

I'm currently using Ansible 1.7.2. I have the following test playbook:
---
- hosts: localhost
tasks:
- name: set fact 1
set_fact: foo="[ 'zero' ]"
- name: set fact 2
set_fact: foo="{{ foo }} + [ 'one' ]"
- name: set fact 3
set_fact: foo="{{ foo }} + [ 'two', 'three' ]"
- name: set fact 4
set_fact: foo="{{ foo }} + [ '{{ item }}' ]"
with_items:
- four
- five
- six
- debug: var=foo
The first task sets a fact that's a list with one item in it. The subsequent tasks append to that list with more values. The first three tasks work as expected, but the last one doesn't. Here's the output when I run this:
PLAY [localhost] **************************************************************
GATHERING FACTS ***************************************************************
ok: [localhost]
TASK: [set fact 1] ************************************************************
ok: [localhost]
TASK: [set fact 2] ************************************************************
ok: [localhost]
TASK: [set fact 3] ************************************************************
ok: [localhost]
TASK: [set fact 4] ************************************************************
ok: [localhost] => (item=four)
ok: [localhost] => (item=five)
ok: [localhost] => (item=six)
TASK: [debug var=foo] *********************************************************
ok: [localhost] => {
"foo": [
"zero",
"one",
"two",
"three",
"six"
]
}
PLAY RECAP ********************************************************************
localhost : ok=6 changed=0 unreachable=0 failed=0
Given the with_items in task 4 and the fact that the output shows the task properly iterated over the items in that list, I would have expected the result to contain all the numbers zero through six. But that last task seems to only be evaluating set_fact with the last item in the list. Is this possibly a bug in Ansible?
Edit: I also just tested this on ansible 1.8 and the output was identical.

Answer 1

There is a workaround which may help. You may "register" results for each set_fact iteration and then map that results to list:
---
- hosts: localhost
tasks:
- name: set fact
set_fact: foo_item="{{ item }}"
with_items:
- four
- five
- six
register: foo_result
- name: make a list
set_fact: foo="{{ foo_result.results | map(attribute='ansible_facts.foo_item') | list }}"
- debug: var=foo
Output:
< TASK: debug var=foo >
---------------------
\ ^__^
\ (oo)\_______
(__)\ )\/\
||----w |
|| ||
ok: [localhost] => {
"var": {
"foo": [
"four",
"five",
"six"
]
}
}

Answer 2

As mentioned in other people's comments, the top solution given here was not working for me in Ansible 2.2, particularly when also using with_items.
It appears that OP's intended approach does work now with a slight change to the quoting of item.
- set_fact: something="{{ something + [ item ] }}"
with_items:
- one
- two
- three
And a longer example where I've handled the initial case of the list being undefined and added an optional when because that was also causing me grief:
- set_fact: something="{{ something|default([]) + [ item ] }}"
with_items:
- one
- two
- three
when: item.name in allowed_things.item_list

Answer 3

I was hunting around for an answer to this question. I found this helpful. The pattern wasn't apparent in the documentation for with_items.
https://github.com/ansible/ansible/issues/39389
- hosts: localhost
connection: local
gather_facts: no
tasks:
- name: set_fact
set_fact:
foo: "{{ foo }} + [ '{{ item }}' ]"
with_items:
- "one"
- "two"
- "three"
vars:
foo: []
- name: Print the var
debug:
var: foo

Answer 4

Jinja 2.6 does not have the map function. So an alternate way of doing this would be:
set_fact: foo="{% for i in bar_result.results %}{{ i.ansible_facts.foo_item }}{%endfor%}"

Answer 5

Below works for me:
- name: set fact
set_fact:
foo_item: "{{foo_item | default([]) + [item]}}"
loop:
- four
- five
- six

Answer 6

Updated 2018-06-08: My previous answer was a bit of hack so I have come back and looked at this again. This is a cleaner Jinja2 approach.
- name: Set fact 4
set_fact:
foo: "{% for i in foo_result.results %}{% do foo.append(i) %}{% endfor %}{{ foo }}"
I am adding this answer as current best answer for Ansible 2.2+ does not completely cover the original question. Thanks to Russ Huguley for your answer this got me headed in the right direction but it left me with a concatenated string not a list. This solution gets a list but becomes even more hacky. I hope this gets resolved in a cleaner manner.
- name: build foo_string
set_fact:
foo_string: "{% for i in foo_result.results %}{{ i.ansible_facts.foo_item }}{% if not loop.last %},{% endif %}{%endfor%}"
- name: set fact foo
set_fact:
foo: "{{ foo_string.split(',') }}"

Answer 7

Looks like this behavior is how Ansible currently works, although there is a lot of interest in fixing it to work as desired. There's currently a pull request with the desired functionality so hopefully this will get incorporated into Ansible eventually.