Возможно, копание в ObjectSpace может помочь:
#!/usr/bin/ruby1.8
include ObjectSpace
def print_references_to_foos
for klass in [Bar, Baz]
each_object(klass) do |o|
s = o.inspect
puts s if s =~ /#<Foo/
end
end
end
class Foo
end
class Bar
def initialize(foo)
@foo = foo
end
end
class Baz < Bar
end
foo1 = Foo.new
foo2 = Foo.new
foo3 = Foo.new
bar1 = Bar.new(foo1)
bar2 = Bar.new(foo1)
bar3 = Baz.new(foo2)
print_references_to_foos
# => #<Baz:0xb7e09158 @foo=#<Foo:0xb7e091a8>>
# => #<Bar:0xb7e0916c @foo=#<Foo:0xb7e091d0>>
# => #<Bar:0xb7e09180 @foo=#<Foo:0xb7e091d0>>
# => #<Baz:0xb7e09158 @foo=#<Foo:0xb7e091a8>>