Feature #1786

unexpected #inspect behaviour

Added by Andy Bogdanov over 5 years ago. Updated almost 4 years ago.



It's said in the documentation that #inspect, if not overridden should use #to_s. Instead of that, when not overridden, #inspect uses #to_s only until the first instance variable assignment, after that it is overridden by interpreter.

~$ cat > test.rb
class MyClass
def to_s() "instance of MyClass" end
def assign
@var = var

~$ irb
irb(main):001:0> load 'test.rb'
=> true
irb(main):002:0> MyClass.new
=> Instance of MyClass
irb(main):003:0> MyClass.new.assign
=> #

Besides that #to_s stays unchanged when it's not overridden and because usually the first instance variable assignment happens in #initialize in most cases #inspect returns something like # and #to_s returns #MyClass:0x9071620

Related issues

Related to Ruby trunk - Bug #4453: Overriding #to_s changes #inspect Closed 03/01/2011


#1 Updated by Roger Pack over 5 years ago

Which versions show this?

#2 Updated by Nobuyoshi Nakada over 5 years ago

  • Status changed from Open to Rejected

to_s isn't inspect.
orverride inspect if you want to change it.

#3 Updated by Yuki Sonoda over 5 years ago

  • Category set to doc
  • Status changed from Rejected to Open
  • Target version set to 1.9.2

I think it is a bug of rdoc documentation.

#4 Updated by Nobuyoshi Nakada over 5 years ago

  • Status changed from Open to Closed
  • % Done changed from 0 to 100

This issue was solved with changeset r25427.
Andy, thank you for reporting this issue.
Your contribution to Ruby is greatly appreciated.
May Ruby be with you.


#5 Updated by Yukihiro Matsumoto over 5 years ago


In message "Re: Feature #1786 unexpected #inspect behaviour"
on Wed, 21 Oct 2009 09:29:53 +0900, Nobuyoshi Nakada redmine@ruby-lang.org writes:

|to_s isn't inspect.
|orverride inspect if you want to change it.

But still, the behavior OP reported is weird. Redefining #to_s should
not affect inspect, if they are totally different.

I will work on.



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