Is there a way to determine whether a hash's key was given?

[nick-merrill]

I'm allowing nil as an input for any of these, but I also want to know whether someone specified nil or whether it's just the default because the key was unspecified. That's fine when we're not dealing with a hash, but when we are, I seem to be running into issues.

  hash :attributes, default: {} do
    string :description, default: nil
    string :location, default: nil
  end

I know that I can determine whether attributes was passed by asking given? :attributes, but how can I determine whether attributes[:description] was given?

Thank you for a wonderful gem! The interaction pattern really makes Rails shine!

[nick-merrill]

Inspecting the code, it seems that the relevant line is here.

    @_interaction_keys = inputs.keys.to_set & self.class.filters.keys

This seems to imply that the feature I'm hoping for does not exist. Maybe I'm missing a way around this though. Any thoughts?

Thanks!

[tfausak]

You're right, we don't currently support this.

[AaronLasseigne]

I feel like this makes sense to add. We could allow given? to take multiple arguments so that it works like dig. If we do that would we want to support checking Array slots or only hash keys?

[tfausak]

I had not heard of dig before. It's new in Ruby 2.3. We could add support by requiring or copying ruby_dig. Seems like we should support array indices as well as hash keys.

[nick-merrill]

That seems like a really intuitive solution to me. I'm not sure how array indices could not be 'given' if they existed, but I only just starting using Ruby.

[AaronLasseigne]

It seems like we all think this is a good direction. I should be able to build this out later this week when I've got some time.