Bug #8817

Method#owner on prepended classes is an instance rather than Class/Method

Added by Bradley Schaefer over 2 years ago. Updated almost 2 years ago.

ruby -v:ruby 2.0.0p247 (2013-06-27 revision 41674) [x86_64-darwin12.4.0] Backport:1.9.3: DONTNEED, 2.0.0: DONE


rdoc indicates that Method#owner will return a class or module that defines a method. http://www.ruby-doc.org/core-2.0/Method.html#method-i-owner

For classes that have prepended modules, the owner is actually an instance.

Example code:

module Mod; end

class Foo
prepend Mod
def foo; 'foo'; end

owner = Foo.instance_method(:foo).owner
puts "Method#owner on a prepended class instance_method: #{owner.inspect}" #=> #Foo:0x007fd34dfd3ea0
puts "Class?: #{owner.is_a? Class}" #=> false
puts "Module?: #{owner.is_a? Module}" #=> false

This had the effect of breaking stubbing in rspec (https://github.com/rspec/rspec-mocks/pull/385) , though a workaround is that the expected Class/Module can be retrieved by asking for the returned object's class.

Related issues

Duplicates Ruby trunk - Bug #7993: owner of methods defined after using Module#prepend Closed 03/01/2013


#1 Updated by Jack Nagel almost 2 years ago

This appears to have been fixed by r44175.

Can it be backported (perhaps with a regression test for this specific bug)?

#2 Updated by Nobuyoshi Nakada almost 2 years ago

  • Status changed from Open to Closed
  • Backport changed from 1.9.3: UNKNOWN, 2.0.0: UNKNOWN to 1.9.3: DONTNEED, 2.0.0: REQUIRED

Thank you, I missed this ticket.

#3 Updated by Tomoyuki Chikanaga almost 2 years ago

  • Backport changed from 1.9.3: DONTNEED, 2.0.0: REQUIRED to 1.9.3: DONTNEED, 2.0.0: DONE

sorry for my late response. r44175 and r44179 were already backported to ruby_2_0_0. see #7993

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