dry-rb/chat

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Jules Ivanic

@guizmaii

ok thanks for your precise answers ! :)

Jules Ivanic

@guizmaii

This message was deleted

Jules Ivanic

@guizmaii

result: https://twitter.com/guizmaii/status/1070020900752384001

Thanks for your help @flash-gordon ! 🙂

Nikita Shilnikov

@flash-gordon

sure, np

Grant Shangreaux

@gcentauri

is it counterproductive to add methods to structs? i'm primarily thinking of predicate type methods that would only return true or false based on the data the struct is holding

like, if i had a struct Fruit and if its name field was "banana" then my_fruit.banana? would return true. or... should there be helper functions like is_banana?(fruit)

Nikita Shilnikov

@flash-gordon

I do have a few methods like this, don't see anything harmful since it's not the same as having an AR-model :)

Grant Shangreaux

@gcentauri

haha thanks

ruby often feels like a slippery slope to me in those regards

Jules Ivanic

@guizmaii

Hi everyone,

I’m using the Task monad and I saw that there’s a pure function but there’s not its “dual” failed (equivalent of Concurent::Promise.reject).

How would you implement it ?

I don’t want to throw exception. Just create an immedialty failed Task

(throwing is expensive in JRuby)

is this something sensible:

    def failed(error)
      Dry::Monads::Task.new(Concurrent::Promise.reject(error))
    end

???

This message was deleted

Nikita Shilnikov

@flash-gordon

@guizmaii yeah, we should have it, no particular reason we don't have, just no one asked for it

Jules Ivanic

@guizmaii

If I have time I’ll push you a PR

Nikita Shilnikov

@flash-gordon

:+1:

Jules Ivanic

@guizmaii

def failed(error, &block) signature looks ok for you ? With the same Undefined trick as in pure ?

Nikita Shilnikov

@flash-gordon

not sure because answering this question would pre-emptying my current brain stack :)

Jules Ivanic

@guizmaii

k. We’ll talk about that around a good old PR so

Tonni Tølbøll Lund Aagesen

@ta

Hello, How do I get transform_keys(&:to_sym) to work with nested structs? It works fine with 1st level attributes.

Nikita Shilnikov

@flash-gordon

create and use the same base class across your structs

Tonni Tølbøll Lund Aagesen

@ta

@flash-gordon like this: https://gist.github.com/ta/5b118b6f48b9a5916647cd12bee67db5 ?

Nikita Shilnikov

@flash-gordon

similar but I think you want to nested structs rather nested schemas

class MyStruct < Base
  attribute :id, Types::Strict::Integer
  attribute :data do
    attribute :code, Types::Strict::Integer.optional.default(nil)
    attribute :msg,  Types::String.optional.default(nil)
  end
end

like that^

Tonni Tølbøll Lund Aagesen

@ta

MyStruct.new({"id" => 1, "data" => { "code" => 200 }}) still doesn't set the code attribute :/

Nikita Shilnikov

@flash-gordon

lemme look into this

Tonni Tølbøll Lund Aagesen

@ta

but thanks for the nested structs hint :)

cool

Nikita Shilnikov

@flash-gordon

change, attribute :data do to attribute(:data, Base) do

because it's not usign Base as default there but Dry::Struct

Tonni Tølbøll Lund Aagesen

@ta

yes, was about to write that solution :)

can there be an argument for having nested structs inherit from parent struct?

Nikita Shilnikov

@flash-gordon

we could have a means for that

I'm not sure what's the best here but having something would be nice

I came across this pattern a copule of times

Tonni Tølbøll Lund Aagesen

@ta

Thanks for helping out

oh btw, can a nested struct be optional like a nested schema?

Nikita Shilnikov

@flash-gordon

you mean absence of key or nil as a value?

Tonni Tølbøll Lund Aagesen

@ta

I have Types::Hash.schema( ... ).optional.default(nil) in some structs

Nikita Shilnikov

@flash-gordon

class MyStruct < Base
  attribute :id, Types::Strict::Integer
  attribute :data, Class.new(Base) {
    attribute :code, Types::Strict::Integer.optional.default(nil)
    attribute :msg,  Types::String.optional.default(nil)
  }.optional
end

that's the closest thing I can think of

and that's not good enough

feel free to post both suggestions to GH and we'll sort it out eventually

Tonni Tølbøll Lund Aagesen

@ta

will do, thx

Tonni Tølbøll Lund Aagesen

@ta

oh my, what one can learn from reading the docs more closely: Types::Hash.schema(name: Types::Strict::String).with_key_transform(&:to_sym) :)

Nikita Shilnikov

@flash-gordon

yeah, if you don't need structs you can use schemas, they also support kind of inheritance

I prefer DSL for describing structs, this is basically it

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