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I'm creating a factory/builder class that returns a generic type:

instance = ClientsFactory[SomeClass].new(:name).build

but I also want to have a static method to call it directly:

instance = ClientsFactory[SomeClass].build(:name)

Problem is, the latter doesn't accept the type annotation, giving me the following error:

Call to method build on ClientsFactory[SomeClass] mistakes a type for a value

Is there a way to use Generics with static methods to return a dynamic type?

I'm creating a factory/builder class that returns a generic type:

instance = ClientsFactory[SomeClass].new(:name).build

but I also want to have a static method to call it directly:

instance = ClientsFactory[SomeClass].build(:name)

Problem is, the latter doesn't accept the type annotation, giving me the following error:

Call to method build on ClientsFactory[SomeClass] mistakes a type for a value

Is there a way to use Generics with static methods to return a dynamic type?

• ruby
• sorbet

Share Improve this question Follow asked Feb 4 at 18:15 paulodiovanipaulodiovani 1,30522 gold badges1616 silver badges3535 bronze badges 1

• 1 See also: stackoverflow/q/62281301/3141234 – Alexander Commented Feb 5 at 14:31

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1 Answer 1

Sorted by: Reset to default 0

You would need to make your method generic as well:

Sorbet.run

# typed: true

class ClientsFactory
  extend T::Generic
  extend T::Sig

  Result = type_member

  class << self
    extend T::Sig
    sig do
      type_parameters(:T)
        .params(type: T.type_parameter(:T), sym: Symbol)
        .returns(ClientsFactory[T.type_parameter(:T)])
    end
    def build(type, sym)
      new # dummy implementation
    end
  end
end

instance = ClientsFactory.build(String, :name)

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