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docs: Storage Operations with EF Core - add section about transactional middleware auto-application #1785

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10 changes: 10 additions & 0 deletions docs/guide/durability/efcore/operations.md
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Original file line number Diff line number Diff line change
Expand Up @@ -137,6 +137,16 @@ public static class TodoHandler
<sup><a href='https://github.com/JasperFx/wolverine/blob/main/src/Testing/Wolverine.ComplianceTests/StorageActionCompliance.cs#L294-L394' title='Snippet source file'>snippet source</a> | <a href='#snippet-sample_todohandler_to_demonstrate_storage_operations' title='Start of snippet'>anchor</a></sup>
<!-- endSnippet -->

::: warning
When a handler returns an `IStorageAction`, Wolverine automatically
applies [transactional middleware](/guide/durability/marten/transactional-middleware) for that handler — even if the
handler is not explicitly decorated with `[Transactional]` or `AutoApplyTransactions()` is not configured.

This behavior is required because Wolverine needs to automatically call `SaveChangesAsync()` on the EF Core `DbContext`
to persist the storage operation, which should be done within a single transaction together with publication of messages
to the outbox/inbox.
:::

## [Entity]

Wolverine also supports the usage of the `[Entity]` attribute to load entity data by its identity with EF Core. As you'd
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