Original code copyright (C) 2009-2022 Rudolf Cardinal (firstname.lastname@example.org).
This file is part of cardinal_pythonlib.
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Helper functions for Django fields.
choice_explanation(value: str, choices: Iterable[Tuple[str, str]]) → str¶
Returns the explanation associated with a Django choice tuple-list.
valid_choice(strvalue: str, choices: Iterable[Tuple[str, str]]) → bool¶
Checks that value is one of the valid option in choices, where choices is a list/tuple of 2-tuples (option, description).
Note that parameters sent by URLconf are always strings (https://docs.djangoproject.com/en/1.8/topics/http/urls/) but Python is happy with a string-to-integer-PK lookup, e.g.
Study.objects.get(pk=1) Study.objects.get(pk="1") # also works
Choices can be non-string, though, so we compare against a string version of the choice.