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Resolve eligible models by configured table names and write Rails-native metadata so generated fixtures reload through their selected model. Preserve conventional metadata-free legacy input compatibility and document valid setup defaults.
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Fixture generation infers model constants from conventional table names. Models with a configured
table_namecan therefore fall back to raw SQL, bypassing model-backed serialization. Generated fixture filenames also do not necessarily tell Rails which model to use when loading them.Extract model selection into
ModelResolver, retaining conventional autoloading while matching loaded models by their actual table and connection pool. Collapse STI descendants to their eligible root, retain SQL fallback for tables without a usable model, and raise on ambiguous independent models before replacing fixture YAML.Every model-backed fixture file now declares its resolved class through Rails’ native
_fixture.model_classmetadata, including conventionally named models. Rails can consume the generated files without a separate class map. Metadata-free conventionally named legacy fixture files remain compatible with Rails’ conventional fixture loading. Empty-file behavior still depends on actual rows, and the reserved_fixturerecord label is rejected rather than silently overwritten.The README describes Rails’ existing mapping precedence, native loading transformations, and raw-table limitations. This adds no eager-loading requirement, public mapping API, or custom mapping cache.