如何使用 jinja2 解析 ansible vars dict

Question

Let's say i have hosts specific variables like this:

projects:
  - project1:
    urls:
    - "https://foo.bar"
    - "https://foo2.bar2"
    names:
    - "some_name"
    address: 
      city1:
      - "street1"
      - "street2"
      city2:
      - "streetX"

And I have to generate files (per project) with jinja2 templating. I will be using all nested variables...

Should I change my vars dict structure or is this one ok..? How can I get all these nested variables?

I tried:

  - name: Create projects
    ansible.builtin.template:
      src: project.yml.j2
      dest: "/client/projects/{{ item | dict2items| json_query('[0].key') }}.yaml"
    loop: "{{ projects }}"

And then, Im getting lost in template file with all loops and lenght of vars with these json_queries...

1. Is this a good way or is there any better?
2. Can you help me with definition of all nested keys/values? Or is there any easy way how to get them?

Answer 1

Your actual structure does not make much sense. You either want to use a list or a dict, not something in between using a key with a null value

I suspect you are looking for a dictionary:

projects:
  project1:
    urls:
      - "https://foo.bar"
      - "https://foo2.bar2"
    names:
      - "some_name"
    address: 
      city1:
        - "street1"
        - "street2"
      city2:
        - "streetX"
  project2:
    # etc.

From there, given your file extension as yaml, I guess you want a template that looks like this project.yml.j2 file:

---
{{ item.value | to_yaml }}

Which you will call like this to create one file named after each project

  - name: Create projects
    template:
      src: project.yml.j2
      dest: "/client/projects/{{ item.key') }}.yaml"
    loop: "{{ projects | dict2items }}"

---

Note that for something as simple, you can remove the burden of an external template file by using copy and streaming the content directly inside the content option:

  - name: Create projects
    copy:
      dest: "/client/projects/{{ item.key') }}.yaml"
      content: "{{ item.value | to_yaml }}"
    loop: "{{ projects | dict2items }}"