> This would allow dynamic control over RAILS_GEM_VERSION and the
> Version Specification passed to the RubyGems 'gem' method for the
> rails gem.  For example, users could test an app or plugin in a
> Continuous Integration environment which performs automated regression
> testing against various old Rails versions.

I'm just not sure that there are a whole lot of use cases that need
this kind of flexibility before environment.rb gets hit.

When I'm testing my apps against multiple rails releases I just use
symlinks in /vendor/rails pointing to various subversion checkouts.

Are there any other common cases you have in mind?   You could always
automate the patching of boot.rb for your gem installer app.

-- 
Cheers

Koz

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