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Skill |
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Uses appropriate column types (e.g. integer enums instead of strings) |
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Consistently sets NOT NULL constraints where appropriate |
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Consistently sets default values where appropriate |
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Consistently adds indexes where appropriate |
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Consistently creates foreign keys |
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Ensures both `up` and `down` migrations work (even when using `change`) |
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Uses joins and `.include` to prevent N+1 query issues |
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Uses sum, count, and windowing functions to perform aggregation in the database |
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Is comfortable using the PostgreSQL console (`rails db`) |
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Is comfortable troubleshooting slow queries using `EXPLAIN ANALYZE` |
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Always returns user-facing results ordered deterministically |
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Uses BIGINT id for tables that could grow past 1 million records |