How to use Ansible's with_item with a variable

问题:

I\'m trying to transform some fields of the items of a list in an Ansible Playbook. Here is the simplest reproduction path, skipping the transformation. The result should be identical to the users variable.

---
# Run with:
# ansible-playbook -i \"localhost,\" loop3.yml

- hosts: localhost
  connection: local
  gather_facts: false
  vars:
    users:
      - name: paul
        uid: 1
      - name: pete
        uid: 2
  tasks:
    - set_fact:
      args:
        useritem:
          name: \'{{ item.name }}\'
          uid:  \'{{ item.uid }}\'
      with_items:
        - users
      register: sf_result

    - debug: var=sf_result

    - set_fact:
        userslist: \"{{ sf_result.results | map(attribute=\'ansible_facts.useritem\') | list }}\"

    - debug: var=userslist

I get this error:

TASK [set_fact useritem={u\'name\': u\'{{ item.name }}\', u\'uid\': u\'{{ item.uid }}\'}] ***
fatal: [localhost]: FAILED! => {\"failed\": true, \"msg\": \"ERROR! \'unicode object\' has no attribute \'name\'\"}

There are several examples very close to what I needbut I could find no working example using set_fact along with with_items and items as a map.

I\'ve tried Ansible 1.9.2, 1.9.4, and 2.0.0-0.6.rc1 with different error messages but no more success. Ansible 2 should allow skipping the second call to set_fact but the error happens before getting there.

回答1:

I thought I did read somewhere that with_items accepts a bare variable name, but it\'s not the case.

The program runs as expected using:

with_items: \"{{ users }}\"