Is there any way to tell which gems and plugins are loaded at runtime for a Rails process?
This should get you everything loaded through rubygems:
Gem.loaded_specs.keysI don't know of a universal way to see which rails plugins are loaded, you can look at the source for Rails::Initializer (pre 3.0) & figure out what your version of rails is doing. Hopefully you know which plugins should be loading & can confirm that from the console when debugging.
With versions:
Gem.loaded_specs.values.map {|x| "#{x.name} #{x.version}"}
I think the above answers using Gem.loaded_specs.keys show the gems on the "load path".
However, you originally asked about gems loaded into memory, and this answer may be more helpful.