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由 Ryuta Kamizono 提交于
`supports_primary_key?` was added to determine if `primary_key` is implemented in the adapter in f0602214. But we already use `primary_key` without `supports_primary_key?` (207f266c, 5f3cf424) and using `supports_primary_key?` has been removed in #1318. This means that `supports_primary_key?` is no longer used in the internal and Active Record doesn't work without `primary_key` is implemented (all adapters must implement `primary_key`). Closes #27977
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