使用 Ansible set_fact 从寄存器结果创建字典 [英] Using Ansible set_fact to create a dictionary from register results

问题描述

在 Ansible 中，我使用 register 将任务的结果保存在变量 people 中.省略我不需要的东西，它有这样的结构:

In Ansible I've used register to save the results of a task in the variable people. Omitting the stuff I don't need, it has this structure:

{
    "results": [
        {
            "item": {
                "name": "Bob"
            },
            "stdout": "male"
        },
        {
            "item": {
                "name": "Thelma"
            },
            "stdout": "female"
        }
    ]
}

我想使用后续的 set_fact 任务来生成一个带有字典的新变量，如下所示:

I'd like to use a subsequent set_fact task to generate a new variable with a dictionary like this:

{
    "Bob": "male",
    "Thelma": "female"
}

我想这可能是可能的，但到目前为止我还没有走运.

I guess this might be possible but I'm going round in circles with no luck so far.

推荐答案

我想我最终做到了.

任务是这样的:

- name: Populate genders
  set_fact:
    genders: "{{ genders|default({}) | combine( {item.item.name: item.stdout} ) }}"
  with_items: "{{ people.results }}"

它循环遍历 people.results 数组中的每个 dicts (item)，每次创建一个新的 dict，如 {Bob: "male"} 和 combine() 是 genders 数组中的新字典，结果如下:

It loops through each of the dicts (item) in the people.results array, each time creating a new dict like {Bob: "male"}, and combine()s that new dict in the genders array, which ends up like:

{
    "Bob": "male",
    "Thelma": "female"
}

它假定键(在本例中为 name)将是唯一的.

It assumes the keys (the name in this case) will be unique.

然后我意识到我实际上想要一个字典列表，因为使用 with_items 循环似乎更容易:

I then realised I actually wanted a list of dictionaries, as it seems much easier to loop through using with_items:

- name: Populate genders
  set_fact:
    genders: "{{ genders|default([]) + [ {'name': item.item.name, 'gender': item.stdout} ] }}"
  with_items: "{{ people.results }}"

这会不断将现有列表与包含单个字典的列表组合在一起.我们最终得到一个 genders 数组，如下所示:

This keeps combining the existing list with a list containing a single dict. We end up with a genders array like this:

[
    {'name': 'Bob', 'gender': 'male'},
    {'name': 'Thelma', 'gender': 'female'}
]

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