[ruby-core:94215] [Ruby master Bug#16086] OpenStruct method access with a block does not raise
From:
kimmo.lehto@...
Date:
2019-08-09 07:36:18 UTC
List:
ruby-core #94215
Issue #16086 has been updated by kke (Kimmo Lehto).
> That is OpenStruct, undefined key does not raise an exception.
> And unused block is silently ignored in common.
Right, this behavior seems to be universal:
```
> { foo: :bar }[:foo] { 'hello' }
=> :bar
> 1.abs { 'hello' }
=> 1
```
> I haven't seen such behavior.
> ```
> $ ruby -rostruct -e 'p OpenStruct.new(hello: "world").hello { |k| puts k.upcase }'
> "world"
> ```
Hmm, I can't replicate it anymore either. I must have been experimenting with `each_pair`.
I guess nothing in this issue is actually an issue and it can be closed. This came from frustration when I assumed there was an `each` method and all I got was `nil` and couldn't figure out why.
----------------------------------------
Bug #16086: OpenStruct method access with a block does not raise
https://bugs.ruby-lang.org/issues/16086#change-80513
* Author: kke (Kimmo Lehto)
* Status: Feedback
* Priority: Normal
* Assignee:
* Target version:
* ruby -v:
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN
----------------------------------------
This can cause confusion.
```ruby
> OpenStruct.new(hello: 'world').each { |k, v| puts k.upcase } # there's no "each" method
=> nil
> OpenStruct.new(hello: 'world').eahc_pair { |k, v| puts k.upcase } # each_pair typo
=> nil
```
An undefined key with a block should maybe raise `NoMethodError` or `ArgumentError`?
A defined key with a block seems to yield the value, I don't see this being documented:
```ruby
> OpenStruct.new(hello: 'world').hello { |k| puts k.upcase }
HELLO
```
Maybe it should raise `ArgumentError` too?
Related: https://bugs.ruby-lang.org/issues/15515
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