# `LexCredo.Check.Warning.NoComplexWithElse`
[🔗](https://github.com/sippy-platform/lex_credo/blob/main/lib/lex_credo/check/warning/no_complex_with_else.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 `normal` and works with any version of Elixir.

## Explanation

Avoid complex `else` blocks in `with` expressions.

When multiple clauses can fail and each needs different handling, normalise
error return types in small private helper functions so the `with` expression
focuses only on the happy path. If you genuinely need to distinguish error
sources, use `case` instead.

    # BAD — 2 else clauses, default max is 1
    with {:ok, user} <- fetch_user(id),
         {:ok, post} <- fetch_post(user) do
      post
    else
      {:error, :not_found} -> {:error, :user_not_found}
      {:error, :forbidden} -> {:error, :access_denied}
    end

    # GOOD — each function returns a normalised error atom,
    # so a single catch-all clause in else is sufficient
    with {:ok, user} <- fetch_user(id),
         {:ok, post} <- fetch_post(user) do
      post
    else
      {:error, reason} -> {:error, reason}
    end

## Check-Specific Parameters

Use the following parameters to configure this check:

### `:max_else_clauses`

  Maximum number of `else` clauses allowed (default: 1).

*This parameter defaults to* `1`.

### `:exclude_test_files`

  When `true`, skips test files. Default: `false`.

*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*