On Sunday, September 16, 2012 5:42:50 AM UTC+1, Ruby-Forum.com User wrote:
>
> This standalone program in using mysql and dbi gems
> I call this program as such from a model
>
> system("ruby standalonepgm.ruby -args ")
>
> In rails 2.0 this worked without any issue.
> In 3.0 the program exits without any way to capture the error.
>
>
> Running under console I see that the program dies because it can't find
> dbi gem!
>
> If I put dbi gem in the Gemfile and do bundle date but then there is
> real trouble.
> Rails refuse to start - "rails server" dies with all kind of issues ..
> I can put in the screendump ..
> but that's unimportant I think.
>
> There seem to be 2 issues
> 1. DBI is surely incompatible with the gods of rails
> 2. Rails creates a sandbox .. and all programs called must live in that
> sandbox (that's why just a require statement doesn't suffice).
>
>
> I don't know what the issue between rails and DBI might be, but the second
bit is down to bundler. Bundler doesn't allow you to require stuff outside
the Gemfile because that's how it's sure that you always have a consistent
set of gems around. Furthermore, when bundler is enabled it sets some
environment variables (RUBYOPT, BUNDLE_GEMFILE etc...) which will be picked
up by the ruby running inside your call to system and cause it to also use
bundler and your Gemfile.
You could either try killing those enviroment variables e.g.
system("RUBYOPT='' ruby standalonepgm.rb ")
Or, probably less jacky, try changing the gemfile entry for dbi to
gem "dbi", :require => false
which means that gem won't be used unless someone requires it, which should
hopefully avoid whatever conflict it has with rails while still allowing
your script to run.
Fred
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