If you want composability how about:
require_keys [:a, :b],
in: defstruct [:a, :b, :c]
require_keys [:message],
in: defexception ...
Also repeating mandatory keys with some default values seems quite annoying.
On 26 May 2016 3:06:25 AM AEST, "José Valim" <jose.va...@plataformatec.com.br>
wrote:
>>
>> All other things being equal or very similar, I think the interface
>which
>> prevents sloppiness is better.
>>
>
>Except they are not equal and similar. One provides composability
>exactly
>because it is less restrictive. The other provides better feedback for
>being more restrictive with checking of options and less composable. We
>can
>make both assessments without bringing the sloppy programmer into the
>discussion.
>
>
>> It will break on compile, hinting me that I didn’t move the complete
>code.
>> Yes, I need to pay attention, but compiler has my back.
>>
>
>Not necessarily?
>
> if some_option? do
> # ...
> defstruct foo: nil
> else
> defstruct foo: nil, bar: :baz
> end
>
>
>> The latter approach means I have to know the semantics of @derive,
>> @require and defstruct/defexception/schema, to know that these things
>tie
>> together.
>>
>
>In both cases you need to understand the semantics of derive and
>require.
>For module attributes though, you do need to know how these things tie
>in
>together. It is the trade-off between restrictive and composable.
>
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Best wishes,
Dmitry Belyaev
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