Right, I understand. I'd argue that many times there isn't much more to say
beyond 'We require this option, please provide it'. Also, a simple way of
ensuring the options are there would be very useful when prototyping, as it
would prevent from `nil`s sneaking deep into the logic, before friendly
error messages are added.
środa, 28 sierpnia 2024 o 17:50:08 UTC+2 José Valim napisał(a):
> 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 <mateus...@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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