Do I really need the @rails3 when creating a gemset?

I'm confused, what does the @rails3 do when creating a new gemset?

I want to run both rails2.1.1 and rails3 applications, and switch between the two.

I create a rvm for 1.9.2 and 1.8.7

And inside 1.9.2 I created 2 gemsets, and installed rails 2.1.1 in one gemset, and rails3 in another gemset.

Am I doing this right?

I'm reading others use t开发者_开发百科he @rails3 in the gemset creation process, and it helps isolate things?? Can someone explain this as I don't get it.

Should I delete the gemsets and start over? or is it higher up that I have to delete?

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There are rubies and gemsets. 1.9.2 and 1.8.7 are your rubies. Each ruby version can have many gemsets (each gemset is tied to one ruby install on your rvm). Personally, I have created a new gemset for each new project to help isolate the gems needed for that project from any other project.

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rails is a gem, so it is usually recommended to isolate it and all the gems it depend on into a gemset.

otherwise, you can also use

rails _2.1.1_ -v

to invoke rails 2.1.1, although the usual recommendation is to create separate gemsets. You can see a lot of info of the gems by rvm info, and rvm list gemsets. Each gemset is a separate folder and keep things isolated from each other quite well.