On Sat, May 22, 2010 at 2:47 PM, pepe <[email protected]> wrote:
> Just in case it applies here is an extract from the Pickaxe book
> (Second edition, page 217):
>
> "Threre's a subtlety when it comes to installing different versions of
> the same application with RubyGems. Even though RubyGems keeps
> separate versions of the application's library files, it does not
> version the actual command you use to run the application. As a
> result, each install of an application effectively overwrites the
> previous one."
That's actually not the whole story, and excerpt from the output of
gem help install:
Description:
The install command installs local or remote gem into a gem repository.
For gems with executables ruby installs a wrapper file into the executable
directory by default. This can be overridden with the --no-wrappers option.
The wrapper allows you to choose among alternate gem versions using
_version_.
For example `rake _0.7.3_ --version` will run rake version 0.7.3 if a newer
version is also installed.
The "actual command you use to run the application" is actually a bit
of boilerplate generated by gems which requires the gem and then calls
the executable in the bin directory of the gem. If you use that
_{version}_ option it requires a specific version of the gem.
So if you have both rails 2.3.5 and 1.2.6 installed then either
rails
or
rails _2.3.5_
will run version 2.3.5 which is the latest version installed. but
rails _1.2.6_
will run version 1.2.6
HTH
BTW, the OP gave rails version 1.3.5 as a example, as far as I know
this a fictitious version since rails went from version 1.2.6 to
version 2.0.0
--
Rick DeNatale
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