fields: add __bool__ for GenFunction

inveniosoftware / invenio-records-rest

Invenio records REST API module.

https://invenio-records-rest.readthedocs.io

MIT License

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Closed slint closed 7 months ago

slint commented 4 years ago

Adds a bool (and nonzero for compatibility) method to the GeneratedValue class, to mimic marshmallow's "missing" behavior.