haskell-beam/beam

Composite PK support

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#792 opened on Apr 9, 2026

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Description

From the docs, it's unclear if Beam supports composite PKs -- i.e. primary keys which reference two or more columns. I imagine there are different ways of doing this (perhaps a product type, perhaps a tuple), but without being too familiar with type families and Beam internals, I'm not able to figure out how to do this

Contributor guide

Research direction
Investigate the Beam library's Table class and primary key implementation. Search for existing discussions or examples of composite keys in the codebase.
Tech stack
haskell
Domain
database
Issue type
Documentation
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-2 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
HaskellGit
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
40