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[13.x] Fix has() and withCount() on HasOneThrough one-of-many relations - #61818
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taylorotwell merged 2 commits intoOct 2, 2026
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Querying the existence of a
HasOneThroughrelation defined withlatestOfMany()orofMany()fails onMySQLandPostgres. This covershas(),whereHas(),whereRelation(),withCount(),withExists()anddoesntHave(). The one-of-many subquery gets joined before the intermediate table, so its on clause points at a table that isn't in the query yet.For example, with
User::latestLogin()defined ashasOneThrough(Login::class, Device::class)->latestOfMany(), callingUser::has('latestLogin')->get()throws Unknown column 'devices.user_id' in 'on clause'. Eager and lazy loading work fine, only the existence queries break.