dry-rb/chat

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Nikita Shilnikov

@flash-gordon

https://twitter.com/NikitaShilnikov/status/992059914817335298

if you want to use them with dry-validation, please stick to the master branch for now

Chris Richards

@cmrichards

hmm.. get this error in the rails console but the code works just fine when running the server: "LoadError (cannot load such file -- dry-struct)"

Nikita Shilnikov

@flash-gordon

what's the stacktrace?

Damien Timewell

@idlefingers

Hey guys, I'm upgrading a project I'm working on to the most recent dry-types and dry-struct and trying to understand how to deal with the removal of constructor_type. Can someone point me in the direction of how to make all attributes omittable, without explicitly having to set .meta(omittable: true)? I used constructor_type :schema to get around it before..

Gustavo Caso

@GustavoCaso

Hi @idlefingers

I think this will do the trick

class User < Dry::Struct
  transform_types do |type|
    type.meta(omittable: true)
  end

  attribute :name, Types::Strict::String
  attribute :age,  Types::Strict::Integer.default(18)
end

Please let me know if that solved the problem

Damien Timewell

@idlefingers

Ahaaaa, I get it. It works! Perfect, thanks a ton for your help @GustavoCaso :)

Gustavo Caso

@GustavoCaso

My pleasure :smile:

Damien Timewell

@idlefingers

Hmmm, but now the meta is included in Hash values :/ ...

class User < Dry::Struct
  transform_types do |type|
    type.meta(omittable: true)
  end

  attribute :foo, Types::Hash.default(Hash.new)
end

User.new.foo # => {:meta=>{:omittable=>true}}

Gustavo Caso

@GustavoCaso

class User < Dry::Struct
  transform_types do |type|
    type.optional
  end

  attribute :name, Types::Strict::String
  attribute :age,  Types::Strict::Integer.default(18)
end

Could you try that one?

Damien Timewell

@idlefingers

That just means it can be nil, but the key is still required, right?

Dry::Struct::Error: [User.new] :name is missing in Hash input

Gustavo Caso

@GustavoCaso

You can set a deafult value if what you are looking is for avoid the meta

Does it helps you? @idlefingers

Damien Timewell

@idlefingers

I'm not sure I follow. In the example class I pasted above, I set the default to be a new hash, but when the class is initialized, that hash includes became {:meta=>{:omittable=>true}}

so instead of User.new.foo # => {:meta=>{:omittable=>true}} I'm trying to get User.new.foo # => {} (which is what constructor_type :schema did before)

Gustavo Caso

@GustavoCaso

All your attributes are hashes?

class User < Dry::Struct
  transform_types do |type|
    type.optional.deafult({})
  end

  attribute :foo, Types::Hash
end

Damien Timewell

@idlefingers

No, they could be anything

Gustavo Caso

@GustavoCaso

I think this will do trick for that case you mentioned

Damien Timewell

@idlefingers

I don't think that will work :( It needs to be able to handle any type

Gustavo Caso

@GustavoCaso

@idlefingers how about this to avoid the extra meta attribute

class User < Dry::Struct
  transform_types do |type|
    if type.default?
      type
    else
      type.meta(omittable: true)
    end
  end
  attribute :foo, Types::Hash.default({})
  attribute :bar, Types::String
end

User.new
=> #<User foo={} bar=nil>

Damien Timewell

@idlefingers

nice! Seems to work. Will test around some more

Gustavo Caso

@GustavoCaso

Sure let me know if you need anything

Damien Timewell

@idlefingers

thanks

Gustavo Caso

@GustavoCaso

your welcome

Nikita Shilnikov

@flash-gordon

this looks like a bug to me, something's not quite right with defaults where

Gustavo Caso

@GustavoCaso

@flash-gordon I'm happy to have a look

Gustavo Caso

@GustavoCaso

@idlefingers I have open a PR fixing the issue dry-rb/dry-types#250

Damien Timewell

@idlefingers

Awesome @GustavoCaso. So with that change, this should work?

transform_types do |type|
  type.meta(omittable: true)
end

Gustavo Caso

@GustavoCaso

It should work I will try running more test with dry-struct

Damien Timewell

@idlefingers

:thumbsup:

Gustavo Caso

@GustavoCaso

but if you want to try and let me know that would be great

Nikita Shilnikov

@flash-gordon

I wouldn't call meta on defaults anyway, it doesn't make sense to me

@idlefingers don't forget, you can create a base class if you don't want to call transform_types many times

Damien Timewell

@idlefingers

@flash-gordon that's exactly what led me down this path :)

https://github.com/iZettle/api-blueprint/commit/c0adae89cdf859f5da3c3c7206b9834315661bfd#diff-3b508d340ef84e8f63319e83336423a1R1

since it's an api wrapper I'm building, it's very hard to be sure all expected attributes are in responses, so I needed to make it a little less strict (constructor_type :schema style :P )

Nikita Shilnikov

@flash-gordon

yeah, it was always hard to control the desired behavior with constructor_type, now it's crystal clear

Damien Timewell

@idlefingers

:+1: it was a little confusing before. Much prefer the new approach, even if my implementation was a bit of a rocky road

Daniel Sandbecker

@daniels

In Dry::Struct, can a default value depend on the value of another attribute?

Nikita Shilnikov

@flash-gordon

however, you can override the constructor

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