如何使用Ansible循环深层嵌套的dict结构？

Question

我被困在一个可能很容易的任务上。我有一个深层嵌套的词典 有3个级别：

---
postgres:
  user: postgres
  password: test123
  hosts:
    - host: localhost
      user: postgres
      password: test123
      users:
        - user: bm
          password: 123
          databases:
            - bm
            - bm2
        - user: bm_test
          password: 123
          databases:
            - bm_test

filebeat:
  - document_type: syslog
    paths:
      - /var/log/syslog

现在Ansible创建了一个新用户：

- name: create postgres users
  postgresql_user:
    login_host: "{{ item.0.host }}"
    login_user: "{{ item.0.user }}"
    login_password: "{{ item.0.password }}"
    name: "{{ item.1.user }}"
    password: "{{ item.1.password }}"
    encrypted: yes
    # priv: "CONNECT/products:ALL"
  with_subelements:
    - "{{ postgres.hosts|default([]) }}"
    - users

现在我陷入了困境：

- name: create databases
  postgresql_db:
    login_host: "{{ item.0.host }}"
    login_user: "{{ item.0.user }}"
    login_password: "{{ item.0.password }}"
    name: "{{ item.1 }}"
  with_subelements:
    - "{{ postgres.hosts|default([]) | sum(attribute='users', start=[]) | list }}"
    - databases

这里的问题是item.0.host，user＆amp;密码未定义。我该怎么办？

由于 添