til/rails/select-a-specific-rails-version-to-install.md

Select A Specific Rails Version To Install

We can install a specific Rails version with gem using the version flag.

$ gem install rails --version 7.1.3

That's only if we already know which specific version we are intending to install.

A better version of this would show us a list of available version and let us select the one we want.

We can do this by fetching all remote Rails versions with gem, splitting that output up into a single version per line, and then piping that to an fzf prompt. The version we navigate to and select will be fed into the gem install command.

gem install rails --version $(
  gem list rails --exact --remote --all \
  | sed -n 's/.*(\([^)]*\)).*/\1/p' \
  | tr ',' '\n' \
  | sed 's/^ //' \
  | fzf
)