By using one version of ruby and one version of rails at any given
time, I've been able to remain blissfully ignorant regarding how the
various version of ruby/rubygems/rails do and do not work together.
But I'd like to better understand this. I've been doing some reading,
but remain confused about a couple of things.
Barring any package/version management meta-tools, here's what I think I've got:
+ multiple versions of rails can co-exist, and you control which one
you use with RAILS_GEM_VERSION in one of the environment files
+ rails is "installed" into a particular version of ruby, since each
ruby install has its own set of gems
+ which ruby you use is determined by your environment or the install
path as usual for unix programs
Assuming the above is correct, my confusion I think is mostly about
rubygems, and what happens if you have multiple ruby versions
installed. I think it gets associated with a particular ruby install
when you run "ruby setup.rb", is that correct? So when you run gem
commands, they default to acting on and with the ruby used by the
above command?
If you have multiple ruby installs, how does one "point" the gem
command at a different ruby? It seems like it might involve
customizing one's environment before running the gem command:
+ point GEM_HOME at the appropriate gems directory ("..../lib/ruby/gems/X.Y")
+ point RUBYLIB at both .../lib/ruby *and* .../lib/site_ruby/X.Y
Is that sufficient? Also, is that necessary, or is there something
more straightforward I'm missing?
Thanks...
-glenn
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