Add a note about deprecated usage of tests as filters

knpuniversity · Apr 16, 2018 · f9a54bc · f9a54bc
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commit f9a54bc
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diff --git a/knpu/idempotency-changed-when.md b/knpu/idempotency-changed-when.md
@@ -108,6 +108,11 @@ How? Instead of saying `changed_when: false`, use an expression:
 If you use Twig, this will look familiar: we're reading a variable and piping it
 through some `search` filter, which comes from Jinja.
 
+***TIP
+Using tests as filters is deprecated and will be removed in Ansible 2.9, use
+`db_create_result.stdout is not search('already exists. Skipped')` instead.
+***
+
 For the migration task, we can do the same. Register the variable first: `db_migrations_result`.
 Copy the `changed_when` and paste that below: