Ruby on Rails

On 14 April 2016 at 19:51, Vince Laurent <lists@ruby-forum.com> wrote:
> "Have you checked the versions of all the gems (including rails) used
> on the old server and installed those and only those on the new one?"
>
> using gem list --local
>
> the old system has 16, the new one 64
> Here is the list of the differences:
>
> gem old new
> ------------------------------------
> actionmailer (2.3.5) (4.2.5)
> actionpack (2.3.5) (4.2.5)
> activerecord (2.3.5) (4.2.5)
> activesupport (2.3.5) (4.2.5)
> acts_as_ferret (0.4.8.2) (0.5.4)
> devise (1.0.5) na
> fastthread (1.0.7) na
> ferret (0.11.6) (0.11.8.6)
> jk-ferret (0.11.8.3) na
> passenger (2.2.11) (5.0.27, 5.0.26)
> rack (1.0.1) (1.6.4)
> rails (2.3.5) (4.2.5)
> warden (0.10.2) na
> will_paginate (2.3.12) na
>
> So... do I get rid of ALL the new gems and try to figure out how to just
> install the old ones?

Probably, you have no hope as you have it, you are still trying to use
rails 4.2.5 which is hugely different to 2.3.5
Installing a specific gem version is easy.
For example
gem install <name> -v n.n.n

Not sure whether for Rails you can just remove the gem versions above
and install the 2.3.5 ones or if you will also have problems with the
support tools that come with rails being of a later flavour

You might also have issues with the version of Ruby you have
installed. I don't know which versions of Ruby 2.3 will run with.
The nicest way to do it would be to use rvm, which lets you run
multiple versions of gems from what are called gemsets, then you can
just make the right versions of gems available to your app. Rvm will
also allow multiple versions of ruby. But really you are on a massive
learning curve, you need someone who knows what they are doing or you
will be splashing about in the swamp for a long time.

Colin

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