DM-40567: Diagnose group mappings to strings #838
Merged
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Gafaelfawr previously accepted a
group_mapping
rule whose value was a string rather than a list of group names and interpreted it as a list of single-letter group names corresponding to the letters in the string. This configuration now produces a validation error during startup.Do this by using proper Pydantic models to validate the value of group_mapping in the settings class and convert to strings only when building the config. This avoids a complex pre-validator that was buggy.