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comp.lang.ruby

1.9 bug?

Roger Pack

10/12/2008 2:42:00 AM

here's a function


def rubygems_version
Gem::RubyGemsVersion if defined? Gem::RubyGemsVersion
end

1.8.6
irb(main):005:0* rubygems_version
=> "1.3.0"

1.9

irb(main):001:0> def rubygems_version
irb(main):002:1> Gem::RubyGemsVersion if defined?
Gem::RubyGemsVersion
irb(main):003:1> end
=> nil

hmm.


I guess it's because of the way that 1.9 'auto integrates' gems?

irb19
>> defined? Gem::RubyGemsVersion
=> nil
>> require 'rubygems'
=> false
>> defined? Gem::RubyGemsVersion
=> nil
>> Gem::RubyGemsVersion
=> "1.3.0"
>> defined? Gem::RubyGemsVersion
=> "constant"

After this point the rubygems_version method works in 1.9


-=R
--
Posted via http://www.ruby-....
3 Answers

Roger Pack

10/12/2008 2:46:00 AM

0

Another 1.9 gems difference [?]

/Users/rogerpack/dev/ruby_19_installed/lib/ruby/gems/1.9.0/gems/rails-2.1.0/lib/rails/plugin/locator.rb:81:in
`map': private method `specification' called for
#<Rails::GemDependency:0x139ba24> (NoMethodError)

doesn't happen in 1.8
(both with gems v 1.3)

Thanks.
-=R
--
Posted via http://www.ruby-....

David Palm

10/13/2008 6:30:00 AM

0

> I guess it's because of the way that 1.9 'auto integrates' gems?
>
> irb19
>>> defined? Gem::RubyGemsVersion
> => nil
>>> require 'rubygems'
> => false
>>> defined? Gem::RubyGemsVersion
> => nil
>>> Gem::RubyGemsVersion
> => "1.3.0"
>>> defined? Gem::RubyGemsVersion
> => "constant"
>
> After this point the rubygems_version method works in 1.9


I've seen this too; it's especially annoying as it stops rails from booting out of the box.

The fix is easy though. In boot.rb, change:
unless rubygems_version >= '0.9.4'
into:
unless (rubygems_version || Gem::RubyGemsVersion) >= '0.9.4'

I'd be very interested in hearing the explanation for this weird behaviour!

Eric Hodel

10/14/2008 6:43:00 AM

0

On Oct 11, 2008, at 19:41 PM, Roger Pack wrote:
> here's a function
>
>
> def rubygems_version
> Gem::RubyGemsVersion if defined? Gem::RubyGemsVersion
> end
>
> 1.8.6
> irb(main):005:0* rubygems_version
> => "1.3.0"
>
> 1.9
>
> irb(main):001:0> def rubygems_version
> irb(main):002:1> Gem::RubyGemsVersion if defined?
> Gem::RubyGemsVersion
> irb(main):003:1> end
> => nil
>
> hmm.
>
>
> I guess it's because of the way that 1.9 'auto integrates' gems?
>
> irb19
>>> defined? Gem::RubyGemsVersion
> => nil
>>> require 'rubygems'
> => false
>>> defined? Gem::RubyGemsVersion
> => nil
>>> Gem::RubyGemsVersion
> => "1.3.0"
>>> defined? Gem::RubyGemsVersion
> => "constant"
>
> After this point the rubygems_version method works in 1.9

Something seems to be preventing defined?'s const_missing from being
handled properly. I'll look into it.