gregschmit / rails-rest-framework / 31645135564

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Improve polymorphic filtering and serialization.

Polymorphic belongs_to associations can't be JOINed, but their backing
*_id/*_type columns live on the base table, so expose them for filtering
and ordering through the dotted `favorite.id`/`favorite.type` paths
(mapping to `favorite_id`/`favorite_type`). A custom filter_fields or
ordering_fields allowlist still gates which paths are reachable.

Polymorphic serialization now honors the association's configured
`fields`: each is resolved against the actual target and included when
it responds, so a field present on only one target (e.g. `price` on
Movie, not Genre) is serialized there and omitted elsewhere. The id,
type, and label are still always emitted.

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