Add compiler support for BiSeqDict, MultiSeqDict, and MultiBiSeqDict #69
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This adds Wire3 codec generation support for three new container types from lamdera/containers: - BiSeqDict: Bidirectional many-to-one dictionary - MultiSeqDict: One-to-many dictionary - MultiBiSeqDict: Many-to-many bidirectional dictionary Changes: - Add DiffableType constructors for the three new types - Add Wire3 encoder/decoder patterns following SeqDict pattern - Add TypeHash support for type hashing and migrations - Add Evergreen migration helpers for all three types Related PR: lamdera/containers#1 Test repo: https://github.com/supermario/qwertytrewq All three types use the same 2-parameter (key, value) structure as SeqDict and work with opaque types that aren't comparable.
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CharlonTank
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Nov 5, 2025
- Add Id.elm with proper opaque ID types (ChatId, DocumentId) - Update Backend.elm to use Id types instead of Never constructors - Update Types.elm to use Id ChatId and Id DocumentId - Update README with links to both PRs and test results - Add COMPILER_CHANGES_NEEDED.md documentation - Install UUID package dependency Test now compiles successfully with modified compiler! Related PRs: - lamdera/containers#1 - lamdera/compiler#69
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Related PRs and Testing
Container implementation: lamdera/containers#1
This PR depends on the three new container types being added in lamdera/containers#1.
Test repository: https://github.com/CharlonTank/qwertytrewq
The test repo demonstrates that the codec generation now works correctly with
MultiBiSeqDict (Id ChatId) (Id DocumentId)in BackendModel.Before This PR
After This PR
Testing Instructions
Both PRs (containers#1 and compiler#69) are required for the new container types to work properly in Lamdera apps.