ruststream 0.7.5

Async messaging framework for Rust: broker-agnostic traits, router, codecs, and a conformance harness for broker authors.
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---
sidebar_position: 6
title: decoded_as
description: "decoded_as::<U>() re-types a record, so its payload assertions decode to U."
---

import Tabs from '@theme/Tabs';
import TabItem from '@theme/TabItem';

# decoded_as

[`decoded_as::<U>()`](api:ruststream::testing::PublishedAssertions::decoded_as) re-types a record, so its payload assertions decode to `U`.

[`out::<M>()`](../records/out.md) returns an untyped record, because a slot may publish several types; `decoded_as` names the one to read.
The same call reads a destination record as a type other than the one it was opened with.
It consumes the record and keeps its messages and their recorded settings.
After it, [`with`](./with.md), `with_codec`, [`decoded`](./decoded.md) and `decoded_with` decode to `U`.

## Example

<Tabs groupId="api">
<TabItem value="macros" label="Macros">

```rust reference="examples/testing_published_payloads.rs#decoded-as"
```

</TabItem>
<TabItem value="manual" label="Manual">

```rust reference="examples/manual/testing_published_payloads.rs#decoded-as"
```

</TabItem>
</Tabs>