ansible/jinja2 获取唯一的子元素

问题描述

我有一个这样的列表:

host_depends:
  - host: abc
    depends:
      - name: item1
      - name: item4
        type: asdf
      - name: item6
  - host: def
    depends:
      - name: item2
      - name: item4
      - name: item6

我需要遍历 depends 元素的唯一名称，所以在这个例子中我想遍历

I need to loop over the unique name of the depends elemnents, so in this example I want to loop over

- item1 
- item2
- item4
- item6

基本上是什么

debug: var=item.1.name
with_subelements:
  - "{{ host_depends }}"
  - depends

可以，但只有独特的元素.

does, but with unique elements only.

如何获取所有 host_depends 项的 depends 以便我可以对它们运行 unique 过滤器并将它们与 一起使用with_items?

How can I get the depends of all host_depends items so I can run a unique filter over them and use them with with_items?

我设法得到所有 depends 项目的列表，如下所示:

I manage to get a list of all depends items like this:

host_depends|map(attribute='depends')|list

但从那里开始，我无法将此列表缩减为 name 项目.

But from there, I fail to reduce this list to the name items.

推荐答案

host_depends|map(attribute='depends')|list

返回一个列表列表，因为depends 是一个列表.要将这个列表列表扁平化/合并成一个列表，请使用内置的扁平化查找:

returns a list of lists, as depends is a list. To flatten/combine this list of lists into one list, use the builtin flatten lookup:

lookup('flattened', host_depends|map(attribute='depends')) |map(attribute='name')|unique|list

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