new examples

ansible.cfg

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+[defaults]
+jinja2_extensions = jinja2.ext.do
+retry_files_enabled = False

load-vars/load-vars.yaml

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+
+- name: Variables loaded dynamically are available everywhere in the playbook
+  gather_facts: no
+  hosts: localhost
+  tasks:
+  - include_vars: extra.yaml
+  roles:
+  - my-vars
+  post_tasks:
+  - debug:
+      var: extra
+  - debug:
+      var: extra_role
+  - assert:
+      that:
+      - extra is defined
+      - extra_role is defined
+
+- name: Even in another playbook !
+  gather_facts: no
+  hosts: localhost
+  tasks:
+  - debug:
+      var: extra
+  - debug:
+      var: extra_role
+  - assert:
+      that:
+      - extra is defined
+      - extra_role is defined

load-vars/roles/my-vars/tasks/main.yaml

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+---
+
+- name: Include extra variables dynamically
+  include_vars: extra.yaml

load-vars/roles/my-vars/vars/extra.yaml

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+---
+
+extra_role: "I'm also there !"

load-vars/vars/extra.yaml

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+---
+  extra: "Yes, I'm there !"

selectattr-filter.yaml

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+---
+
+- name: The selectattr filter can be used to filter a list, based on a criteria
+  gather_facts: no
+  hosts: localhost
+  vars: 
+    input:
+    - id: 2555418101286
+      system_name: hits
+    - id: 2555418119094
+      system_name: Say_Hello
+    - id: 2555418119095
+      system_name: Say_Goodbye
+  tasks:
+  - block:
+    - debug:
+        var: output
+    - assert:
+        that:
+        - output|length == 1
+        - (output|first).system_name == 'Say_Hello'
+    vars:
+      output: "{{ input|selectattr('id', 'equalto', id)|list }}"
+      id: 2555418119094
+  - block:
+    - debug:
+        var: output
+    - assert:
+        that:
+        - output|length == 1
+        - (output|first).id == 2555418119094
+    vars:
+      output: "{{ input|selectattr('system_name', 'equalto', system_name)|list }}"
+      system_name: Say_Hello

set-theory-filters.yaml

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+---
+
+- name: 'Set Theory Filters: union operates on set of structured objects'
+  gather_facts: no
+  hosts: localhost
+  tasks:
+  - block:
+    - debug:
+        var: output
+    - assert:
+        that:
+        - output|length == 3
+    vars:
+      output: "{{ input1|union(input2) }}"
+      input1:
+      - id: 1
+        name: john
+      - id: 3
+        name: smith
+      input2:
+      - id: 1
+        name: john
+      - id: 2
+        name: jane
+

variables-in-templates/templates/sub-template.j2

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+{{ input|default("KO") }}{{ input_template|default("KO") }}OK

variables-in-templates/templates/template.j2

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+{%- set input_template = "OK" -%}
+{{ lookup('template', 'sub-template.j2') }}

variables-in-templates/variables-in-templates.yaml

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+---
+
+- name: 'Variable in templates: a template can use a variable from task or playbook but not from an outter template'
+  gather_facts: no
+  hosts: localhost
+  vars: 
+    input: 'OK'
+  tasks:
+  - block:
+    - debug:
+        var: output
+    - assert:
+        that:
+        - output == "OKKOOK"
+    vars:
+      output: "{{ lookup('template', 'template.j2') }}"