From: "briankung (Brian Kung) via ruby-core" <ruby-core@...>
Date: 2025-08-18T14:51:52+00:00
Subject: [ruby-core:122976] [Ruby Feature#12282] Hash#dig! for repeated applications of Hash#fetch

Issue #12282 has been updated by briankung (Brian Kung).


Agreed, this feature would be useful. I would like to essentially assert that all of the nodes along the path are found.

To that end, I would suggest calling it something like `#fetch_path`:

``` ruby
object = {foo: {bar: { baz: true}}

object.fetch_path(:foo, :bar, :baz) #=> true
object.fetch_path(:foo, :baz, :bar) #=> (irb):3:in 'Hash#fetch_path': key not found: :baz (KeyError)
```


----------------------------------------
Feature #12282: Hash#dig! for repeated applications of Hash#fetch
https://bugs.ruby-lang.org/issues/12282#change-114279

* Author: robb (Robb Shecter)
* Status: Open
----------------------------------------
A new feature for your consideration: #dig! which is to #fetch as #dig is to #[]. For me and maybe many others, Hash#fetch is used much more than Hash#[]. And traversing multiple fetches isn't very convenient nor Ruby-like, e.g.: places.fetch(:countries).fetch(:canada).fetch(ontario).

Here's how it would work:

~~~ruby
places = { countries: { canada: true } }

places.dig  :countries, :canada  # => true
places.dig! :countries, :canada  # => true

places.dig  :countries, :canada, :ontario  # => nil
places.dig! :countries, :canada, :ontario  # => KeyError: Key not found: :ontario

~~~


Here's an implementation and tests: https://gist.github.com/dogweather/819ccdb41c9db0514c163cfdb1c528e2



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