Add "Writing Validations" - Githubissues

carvel-dev / ytt

YAML templating tool that works on YAML structure instead of text

https://carvel.dev/ytt

Apache License 2.0

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Add "Writing Validations" #727

Closed pivotaljohn closed 2 years ago

pivotaljohn commented 2 years ago

Notes:

includes likely points-of-confusion
one_not_null=
- explicitly call-out the need to mark target fields with @schema/nullable
"To avoid confusion: convey this mapping from typed-terms to the concept of 'required'"
"Show the overall pattern, explicitly... and then with examples....(e.g. pattern = go from keyword arg to assertion function; go from assertion function to explicit lambda)"