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doc/website: document tweaking transaction isolation levels (#2774)

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* docs: document tweaking transaction isolation levels

* Update doc/md/tutorial-todo-gql-tx-mutation.md

Co-authored-by: Ariel Mashraki <7413593+a8m@users.noreply.github.com>

* Update doc/md/tutorial-todo-gql-tx-mutation.md

* Update doc/md/tutorial-todo-gql-tx-mutation.md

Co-authored-by: Ariel Mashraki <7413593+a8m@users.noreply.github.com>
This commit is contained in:
Itay Garin
2022-07-20 14:52:26 +03:00
committed by GitHub
parent 5daf02bc73
commit 88183c1f4c
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doc/md/tutorial-todo-gql-tx-mutation.md
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@@ -50,6 +50,24 @@ func (mutationResolver) CreateTodo(ctx context.Context, todo TodoInput) (*ent.To
}
```
## Isolation Levels
If you'd like to tweak the transaction's isolation level, you can do so by implementing your own `TxOpener`. For example:
```go
srv.Use(entgql.Transactioner{
TxOpener: entgql.TxOpenerFunc(func(ctx context.Context) (context.Context, driver.Tx, error) {
tx, err := client.BeginTx(ctx, &sql.TxOptions{Isolation: sql.LevelRepeatableRead})
if err != nil {
return nil, nil, err
}
ctx = NewTxContext(ctx, tx)
ctx = NewContext(ctx, tx.Client())
return ctx, tx, nil
})
})
```
---
Great! With a few lines of code, our application now supports automatic transactional mutations. Please continue to the