@@ -122,6 +122,7 @@ In this case, we want to find the mount point for a given path across our machin

         msg: "{{(ansible_facts.mounts | selectattr('mount', 'in', path) | list | sort(attribute='mount'))[-1]['mount']}}"

+.. _omit_elements_from_list:

 Omit elements from a list

 -------------------------

@@ -158,6 +159,30 @@ Another way is to avoid adding elements to the list in the first place, so you c

           - "bar"

+

+.. _combine_optional_values:

+

+Combine values from same list of dicts

+---------------------------------------

+Combining positive and negative filters from examples above, you can get a 'value when it exists' and a 'fallback' when it doesn't.

+

+.. code-block:: YAML+Jinja

+ :caption: Use selectattr and rejectattr to get the ansible_host or inventory_hostname as needed

+

+    - hosts: localhost

+      tasks:

+        - name: Check hosts in inventory that respond to ssh port

+          wait_for:

+            host: "{{ item }}"

+            port: 22

+          loop: '{{ has_ah + no_ah }}'

+          vars:

+            has_ah: '{{ hostvars|dictsort|selectattr("1.ansible_host", "defined")|map(attribute="1.ansible_host")|list }}'

+            no_ah: '{{ hostvars|dictsort|rejectattr("1.ansible_host", "defined")|map(attribute="0")|list }}'

+

+

+.. _custom_fileglob_variable:

+

 Custom Fileglob Based on a Variable

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