when and with on same variable

[Alexander Popov]

    

    - debug: msg="test for items"   # skip because condition is not fullfiled

      when: groups.unexisting is defined

    

    - debug: msg="test for items"

      when: groups.unexisting  is defined  

      with_items: unexisting  #failed here with with_items expects a list or a set

[Martin]

    - debug: msg="test for items"

      when: groups.unexisting  is defined  

      with_items: groups.unexisting  #might work if you reference the same variable?

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[Brian Coca]

when gets evaluated INSIDE the with loop, so it cannot condition the
executing of with, this is done so you can do when: item == 'blah' for
example to condition each iteration in the loop.

to deal with undeinfed with_ vars, do the following:

with_ : "{{ myvar|default([])}}"

^ the empty [] will skip the task as there is nothing to loop over.

some times you need more complex conditions, ternary filter can help:

with_ : "{{ unexisting is defined|ternary( groups['unexisting'], []) }}"


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Brian Coca