ansible filter with json_query

Question

I write this:

- name: test for seed
  debug:
    var: hostvars|json_query("*.ansible_host")

And it prints every host. But this does not filter hosts:

- name: test for seed
  debug:
    var: hostvars|json_query("*[?ansible_host=='192.168.56.101']")

It just prints an empty list, while I'm sure this host exists. This is the relevant inventory line:

[build-servers]
build-server ansible_host=192.168.56.101

Am I doing something wrong?

score 3 · Accepted Answer · answered Jul 25 '17 at 08:25

3

You should filter resulting list, not original hash: * | [?ansible_host=='192.168.168.21']

P.S. you usually don't want to use var option of debug module to print Jinja statements, use msg instead.

answered Jul 25 '17 at 08:25

Hmm, when I write `*[?ansible_host=='192.168.56.101']` I read it like `select every hash where ansible_host == 192.168.56.101`. It is wrong, obviously, but can you explain it a bit more? Or give a link to docs to learn it? Your solutions works, anyway. – vfsoraki Jul 25 '17 at 08:37
Afaik [filters](http://jmespath.org/specification.html#filter-expressions) work only for lists, not hashes. So you make a list of all items within original hash, stop further projections with pipe and then work with this list applying required filters. – Konstantin Suvorov Jul 25 '17 at 08:48

1 Answers1