Ansible looping over nested variables

Rancher 2.x has powerful api which you can use with ansible and other automation tools. Let’s assume we have scenario that we are using Rancher for creating and deploying kubernetes resources with ansible. We need to create some projects and namespaces within Rancher. We will use the following variables to create Rancher projects and namespaces.

```
projects:
  project-a:
    - namespace-x
    - namespace-y
  project-b:
    - namespace-z
```

Each namespace should be created in the related project. In order to achieve this goal we will use loop over nested variables. We will use the following ansible playbook:

```
- name: Check if {{ roleinputvar }} project already exists
  uri:
    url: "{{ rancher_endpoint }}/cluster/{{ cluster_id }}/projects/?name={{ roleinputvar }}"
    return_content: "yes"
    validate_certs: "no"
    body_format: json
    force_basic_auth: "yes"
    user: "{{ rancher_username }}"
    password: "{{ rancher_secret_key }}"
    method: GET
  register: check_projects
- name: Create {{ roleinputvar }} project
  uri:
    url: "{{ rancher_endpoint }}/projects"
    return_content: "yes"
    validate_certs: "no"
    body_format: json
    force_basic_auth: "yes"
    user: "{{ rancher_username }}"
    password: "{{ rancher_secret_key }}"
    status_code: 201
    method: POST
    body:
      clusterId: "{{ cluster_id }}"
      name: "{{ roleinputvar }}"
      description: '{{ roleinputvar }} Project'
  when: check_projects.json.data | length == 0
- name: Set project_name for project {{ roleinputvar }}
  set_fact:
    project_name: "{{ check_projects.json.data[0].name }}"
- name: Set project_id for project {{ roleinputvar }}
  set_fact:
    project_id: "{{ check_projects.json.data[0].id }}"
- name: Create namespace {{ projects[project_name] }}
  uri:
    url: "{{ rancher_endpoint }}/cluster/{{cluster_id}}/namespaces"
    validate_certs: "no"
    body_format: json
    force_basic_auth: "yes"
    user: "{{ rancher_username }}"
    password: "{{ rancher_secret_key }}"
    status_code: 201
    method: POST
    body:
      projectId: "{{ project_id }}"
      name: "{{ item }}"
      description: "{{ item }} Namespace"
  register: create_ns
  with_items: "{{ projects[project_name] }}"
  failed_when:
  - 'create_ns.json.type != "error"'
  - 'create_ns.json.type != "namespace"'
```