foo.changed vs foo|changed

[Jason Gilfoil]

It's unfortunately exceedingly difficult to search for "|" in most search engines, so finding info about this was not fruitful.

My question is, is there a difference between foo.changed and foo|changed, especially used in a "when:" parameter?

If there's no difference, what's the preferred syntax?

Thanks!

[Matt Martz]

There is a difference, in fact the preferred syntax is actually `when: foo is changed`

There is no guarantee that the attribute will exist on a returned object.  In addition to handling a non existent key/attribute, the changed test also has some more complex logic, where it will look into a sub-key called `results` too.

Historically we did not have jinja tests, which is what the `foo is changed` represents, so we registered them as filters (`foo|changed`).  We are deprecating using tests as filters, which is why the `is` syntax is preferred there.

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Matt Martz
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sivel.net

[Jason Gilfoil]

Thanks for the full and complete answer!