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adds support for null values to the ternary filter (#45303)

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* adds support for null values to the ternary filter

This change adds a third optional argument to the ternary filter to
handle a null value.  If the third option is specified null and false
are treated differently.

For instance, take the following example:

{{ enabled | ternary('no shutdown', 'shutdown') }}

If enabled == True, then 'no shutdown' is used.
If enabled in (False, None), then 'shutdown' is used.

With this change the following is possible:

{{ enabled | ternary('no shutdown', 'shutdown', omit) }}

If enabled == True, then 'no shutdown'
If enabled == False, then 'shutdown'
If enabled == None, then omit

* update documentation with example of filter

* update filter documentation example per comments

* fix logic error in user_guide example
This commit is contained in:
Peter Sprygada 2018-09-24 18:57:19 -04:00 • committed by ansibot
commit 1e68881c40
2 changed files with 8 additions and 2 deletions
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4
docs/docsite/rst/user_guide/playbooks_filters.rst
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@ -1081,6 +1081,10 @@ To use one value on true and another on false (new in version 1.9)::
{{ (name == "John") | ternary('Mr','Ms') }}
To use one value on true, one value on false and a third value on null (new in version 2.8)::
{{ enabled | ternary('no shutdown', 'shutdown', omit) }}
To concatenate a list into a string::
{{ list | join(" ") }}