From: tenderlove@...
Date: 2021-04-12T15:28:31+00:00
Subject: [ruby-core:103405] [Ruby master Feature#17753] Add Module#namespace

Issue #17753 has been updated by tenderlovemaking (Aaron Patterson).


> Yes, c.name is "X::C", but as I said above, that is just a string.

It's also a way to inform the user where that constant lives.  The contents of the string have meaning.

> On the other hand, if you are in a very specific situation where you can assume that loop makes sense for all k, you can always name.sub(/::\w+$/, '') and const_get, modulus details.

This would work if I could trust the `name` method on a class (I can't, especially in a Rails project).

Of course there are some edge cases with redefinition, but since the "namespace" method would line up with what the "name" method is supposed to return, I think it would be easy to understand the behavior.

----------------------------------------
Feature #17753: Add Module#namespace
https://bugs.ruby-lang.org/issues/17753#change-91499

* Author: tenderlovemaking (Aaron Patterson)
* Status: Open
* Priority: Normal
----------------------------------------
Given code like this:

```ruby
module A
  module B
    class C; end
    class D; end
  end
end
```

We can get from `C` to `B` like `C.outer_scope`, or to `A` like
`C.outer_scope.outer_scope`.

I want to use this in cases where I don't know the outer scope, but I
want to find constants that are "siblings" of a constant.  For example,
I can do `A::B::C.outer_scope.constants` to find the list of "sibling"
constants to `C`.  I want to use this feature when walking objects and
introspecting.  For example:

```ruby
ObjectSpace.each_object(Class) do |k|
  p siblings: k.outer_scope.constants
end
```

I've attached a patch that implements this feature, and there is a pull request on GitHub [here](https://github.com/ruby/ruby/pull/4326).

---Files--------------------------------
0001-Add-Module-outer_scope.patch (5.93 KB)
0001-Add-Module-namespace.patch (5.89 KB)


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