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authorEugene Kenny <elkenny@gmail.com>2017-03-13 02:01:18 +0000
committerEugene Kenny <elkenny@gmail.com>2017-07-09 01:26:20 +0100
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Sync transaction state when accessing primary key
If a record is modified inside a transaction, it must check the outcome of that transaction before accessing any state which would no longer be valid if it was rolled back. For example, consider a new record that was saved inside a transaction which was later rolled back: it should be restored to its previous state so that saving it again inserts a new row into the database instead of trying to update a row that no longer exists. The `id` and `id=` methods defined on the PrimaryKey module implement this correctly, but when a model uses a custom primary key, the reader and writer methods for that attribute must check the transaction state too. The `read_attribute` and `write_attribute` methods also need to check the transaction state when accessing the primary key.
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