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Daniel Goldman 989eeb243f Add an `undef` global Jinja function (#75435) ... * add tests for fail filter also tests that fail does not block inspectability * add fail filter fallback message is a bit clunky, since you can't invoke a filter without specifying an input. That is, "{{ fail }}" doesn't work, so you have to do "{{ None | fail }}" * document 'fail' filter * add changelog fragment * fail filter uses default message on Undefined or emptystring makes it slightly easier to use the default message: ```diff - "{{ None | fail }}" + "{{ '' | fail }}" ``` and the user sees a slightly more relevant message if the message itself is undefined: ```diff - The error was: {{ failmsg | fail }}: 'failmsg' is undefined + The error was: {{ failmsg | fail }}: Mandatory variable has not been overridden ``` * rebuild as the builtin `Undefined` * harmonise `hint` parameter for make_undefined with jinja * use code block for documentation item [ref](https://github.com/ansible/ansible/pull/75435#discussion_r707661035) * rename to `undef` to expose less Python into the Jinja [ref](https://github.com/ansible/ansible/pull/75435#pullrequestreview-757799031) * explicitly instantiate undefined value now that it's possible see I knew we would break something with reflection * preserve test coverage of undefined variable Co-authored-by: Matt Davis <nitzmahone@users.noreply.github.com>		3 years ago
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tasks	Add an `undef` global Jinja function (#75435)	3 years ago
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