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由 Arthur Neves 提交于
When table has a composite primary key, the `primary_key` method for sqlite3 and postgresql was only returning the first field of the key. Ensures that it will return nil instead, as AR dont support composite pks.
5acd24bb
When table has a composite primary key, the `primary_key` method for sqlite3 and postgresql was only returning the first field of the key. Ensures that it will return nil instead, as AR dont support composite pks.