We considered this but the error we would raise is generic. It is much
better for you to validate afterwards and raise good error messages that
say it is missing and which value you should pass instead and what it is
used for!
On Wed, Aug 28, 2024 at 11:30 Mateusz Front <mateusz.fr...@swmansion.com>
wrote:
> Hi,
>
> WDYT about adding a `strict: boolean` option to `Keyword.validate/2` that
> would make it return an error if a key that doesn't have a default value
> provided is absent? The returned value in case of an error could be
> `{:error, unknown_keys, missing_keys}`, for example:
>
> {:error, [], [:b]} = Keyword.validate([a: :foo], [:a, :b], strict: true)
> {:error, [:c], [:b]} = Keyword.validate([a: :foo, c: :bar], [:a, :b],
> strict: true)
> {:error, [:c], []} = Keyword.validate([a: :foo, b: :foobar, c: :bar], [:a,
> :b], strict: true)
>
> in case of success, the result would remain as it is now:
>
> {:ok, [a: :foo, b: :bar]} = Keyword.validate([a: :foo, b: :bar], [:a, :b],
> strict: true)
> {:ok, [b: :bar, a: :foo]} = Keyword.validate([a: :foo], [:a, b: :bar],
> strict: true)
>
> The behaviour would be unchanged when the strict is set to false
> (default). The bang version would be adjusted accordingly.
>
> Thanks ;)
>
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