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Phoenix LiveView: UUID vs Integer ID Type Mismatch Error

Phoenix LiveView: UUID vs Integer ID Type Mismatch Error

After switching to UUID PKs in Phoenix, remove String.to_integer/1 calls on ID fields — Ecto handles UUID strings natively.

When switching from integer to UUID primary keys in a Phoenix LiveView application, a common error occurs: `handle_event` crashes with `:erlang.binary_to_integer/1` failing on a UUID string. Cause: Code still calls `String.to_integer/1` on an ID field that is now a UUID string. Fix: Remove the `String.to_integer/1` call — keep the endpoint_id as a string. Ecto handles string UUIDs natively without conversion. Optional validation: Use `Ecto.UUID.cast(endpoint_id)` which returns `{:ok, uuid}` or `:error`. Lesson: When migrating to UUID primary keys, search the entire codebase for `binary_to_integer`, `String.to_integer`, and similar integer conversion calls on ID fields.

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Elixir

Confidence

90%

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1 source

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Created

April 04, 2026

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