[ruby-core:103184] [Ruby master Feature#17472] HashWithIndifferentAccess like Hash extension

Issue #17472 has been updated by Dan0042 (Daniel DeLorme).


lamont (Lamont Granquist) wrote in #note-24:
> Although I really need to be able to inherit from the class and wrap convert_key/convert_value and it would be useful to have a private regular_writer/regular_update bypass (for performance) that subclasses could use for already-converted access.

I don't think the current proposal would allow that. Although it's not super clear what the proposal is, specifically. It's "something" to make HashWithIndifferentAccess more performant via C implentation, but that "something" is quite vague.


joelb (Joel Blum) wrote in #note-26:
> I think we are not being needlessly stubborn, we really do run into symbol/string hash key bugs enough to make us want to use HashwithIndifferentAccess.

Then by all means use it! What's the problem with HashWithIndifferentAccess if that's what you need?

Several people have expressed their doubt that a C implementation would provide any significant speedup, and I agree. But as mame said, "we need to experiment" to see if that's the case or not. But before that we need a concrete proposal. Is it to add `Hash#compare_by_symbol=` ?

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Feature #17472: HashWithIndifferentAccess like Hash extension
https://bugs.ruby-lang.org/issues/17472#change-91259

* Author: naruse (Yui NARUSE)
* Status: Open
* Priority: Normal
* Target version: 3.1
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Rails has [ActiveSupport::HashWithIndifferentAccess](https://api.rubyonrails.org/classes/ActiveSupport/HashWithIndifferentAccess.html), which is widely used in Rails to handle Request, Session, ActionView's form construction, ActiveRecord's DB communication, and so on. It receives String or Symbol and normalize them to fetch the value. But it is implemented with Ruby. If we provide C implementation of that, Rails will gain the performance improvement.

summary of previous discussion: https://github.com/rails/rails/pull/40182#issuecomment-687607812



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