# `Soundcheck.Check.Warning.StreamContainerWithoutPhxUpdate`
[🔗](https://github.com/leonqadirie/soundcheck/blob/v0.1.0/lib/soundcheck/check/warning/stream_container_without_phx_update.ex#L1)

## Basics

> #### This check is disabled by default. {: .neutral}
>
> [Learn how to enable it](`e:credo:config_file.html#checks`) via `.credo.exs`.

This check has a base priority of `high` and works with any version of Elixir.

## Explanation

Flags elements that loop over a stream whose parent lacks
`phx-update="stream"`. Without it, LiveView replaces the container's
children on every update instead of inserting and deleting stream
items, so items disappear. LiveView reports this only in the browser,
in debug mode.

Before:

    <ul id="posts">
      <li :for={{id, post} <- @streams.posts} id={id}>{post.title}</li>
    </ul>

After:

    <ul id="posts" phx-update="stream">
      <li :for={{id, post} <- @streams.posts} id={id}>{post.title}</li>
    </ul>

Loops whose parent is a component or slot, or that sit at the
template root, are skipped: the container is rendered elsewhere.

Confidence: high. Tier: syntactic (works without compiling).

## Check-Specific Parameters

Use the following parameters to configure this check:

### `:excluded_paths`

  Paths to skip (atoms, binaries as path segments, or regexes).

*This parameter defaults to* `[~r/\/test\//, "test"]`.

### `:strict`

  Unused.

*This parameter defaults to* `false`.

## General Parameters

Like with all checks, [general params](`e:credo:check_params.html`) can be applied.

Parameters can be configured via the [`.credo.exs` config file](`e:credo:config_file.html`).

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*Consult [api-reference.md](api-reference.md) for complete listing*