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Throw
Feature::Subject::NotApplicable
when an invalid subject is specified. This allows for better differentiation of error cases.Given a feature specified as:
and a feature check like
Feature.enabled?(:check, user_id: 1)
then when the feature was modified to include additional constraints likeevery caller would immediately fail with
Feature::Subject::Invalid
. In production this creates an intensely tight coupling between the caller and feature data source that is effectively impossible to safely modify.By allowing partial subject checks the coupling is removed, allowing for data source additions without active caller errors.
If a subject is specified by the caller but removed from the data source, an error is still created.