Exclude generated columns from fixture snapshots - #101
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The Test::Unit tests shared one top-level create_and_blow_away_old_db helper defined in test_helper.rb, which mixed connection configuration and schema definition into the global namespace. Move it into a test/support/test_database.rb module that the four test classes using it include. The module exposes the same create_and_blow_away_old_db entry point and keeps the file-backed test.db configuration unchanged, so behavior is identical; it also separates connection setup from schema creation so the connection configuration can be changed in isolation later. The module deliberately defines no setup/teardown instance methods: including classes define their own, so any future lifecycle hook must be registered through Test::Unit's class-level setup/teardown callbacks.
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Generated fixture YAML included database-generated values that Rails cannot write back when loading fixtures.
This filters only adapter-reported generated columns after both model-backed and raw-query extraction, retaining custom query fields and ordinary persisted attributes. It adds real SQLite generated-column coverage for both paths, including custom model-table and custom SQL-alias regressions.
The README documents the behavior and the changelog records the 0.6 fix.