From: sbellware@...
Date: 2019-08-16T00:57:32+00:00
Subject: [ruby-core:94377] [Ruby master Bug#16106] UnboundMethod owner	points to base class

Issue #16106 has been updated by sbellware (Scott Bellware).


Indeed, that's why I was surprised. I wasn't expecting `owner` to be a pointer to a class that I wasn't working with.

To correct the code I was working on, I now pass around both the UnboundMethod instance as well as the class, and ignore the `owner` method entirely.

I guess what also throws me, from a usability perspective, is that `owner` seems asymmetrical with Method#receiver, where Method#receiver is a pointer to the de facto instance that the method is from. I appreciate that this is largely immaterial due to the difference between objects and classes, but just a bit of background on what was informing my biases at the time.

Ideally, it might have been nice to have a method named `implementer` on UnboundMethod that does what `owner` does, and have `owner` reflect some symmetry with Method#receiver. Just a thought.

----------------------------------------
Bug #16106: UnboundMethod owner points to base class
https://bugs.ruby-lang.org/issues/16106#change-80792

* Author: sbellware (Scott Bellware)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: ruby 2.6.1p33 (2019-01-30 revision 66950) [x86_64-darwin17]
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN
----------------------------------------
This may not be a bug. It may be my misinterpretation of the feature.

When using UnboundMethod#owner on a class that was created with `Class.new(SomeBaseClass)`, the owner is reported as the `SomeBaseClass `rather than the new class.

This was a surprising outcome, since I presumed that the owner method would point to the class rather than the class's base class.

Example:

```
class SomeClass
  def some_method
  end
end

C = Class.new(SomeClass)

m = C.instance_method(:some_method)

pp m.owner
# => SomeClass

# I would have expected the owner to be C
```

Is this expected behavior?

Thanks,
Scott

---Files--------------------------------
unbound_method_owner_sketch.rb (176 Bytes)


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