1.9 bug?

Ruby
1

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

2

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 methodspecification’ called for
#Rails::GemDependency:0x139ba24 (NoMethodError)

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

Thanks.
-=R

3

=> “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!

4

On Oct 11, 2008, at 19:41 PM, Roger P. wrote:

=> “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.