Versions don't coincide

[flocela]

Just bought the testing-rails book. It referred me to this application.
I have ruby 2.6.2.
$: bin/rails server
Results in: Your Ruby version is 2.6.2, but your Gemfile specified 2.2.0

Switched to version 2.2.0
$bin/build
Results in No such file or directory
$: bin/rails server
Results in Error installing bundler: bundler requires Ruby version >= 2.3.0.

Switched to version 2.3.0
$ gem install bundler
Results in 1 gem installed
$bin/setup results in Your Ruby version is 2.3.0, but your Gemfile is 2.2.0

It looks like Ruby 2.2.0, 2.3.0, and 2.6.2 don't work with this application. How can I make the application work?

Thanks,
Flo

[flocela]

Using version 2.2.0
$ bin/setup
Results in
== Installing dependencies ==
ERROR: Error installing bundler:
bundler requires Ruby version >= 2.3.0.
rbenv: bundle: command not found

The `bundle' command exists in these Ruby versions:
2.3.0
2.6.2

[andyw8]

@flocela Bunder 2.x requires Ruby 2.3. It should work with Bundler 1.17.3 (the latest 1.x release).

[flocela]

Thanks andyw8!
My new problem is this
$bundle install
An error occurred while installing nokogiri (1.6.6.2), and Bundler cannot continue.
Results in
Make sure that gem install nokogiri -v '1.6.6.2' --source 'https://rubygems.org/' succeeds before bundling.
I tried
$ gem uninstall nokogiri
$ xcode-select --install
$ gem install nokogiri
Results in
Fetching: mini_portile2-2.4.0.gem (100%)
Successfully installed mini_portile2-2.4.0
Fetching: nokogiri-1.10.3.gem (100%)
ERROR: Error installing nokogiri:
nokogiri requires Ruby version >= 2.3.0.

I'm actually always getting caught up in version problems. Is there some website that explains how all the gems fit together with the bundler and ruby versions?

[flocela]

I believe I am using the right bundler after your suggestion.

gem install bundler -v "=1.17.3"
Fetching: bundler-1.17.3.gem (100%)
Successfully installed bundler-1.17.3
1 gem installed

[andyw8]

@flocela The error is suggesting that you install Nokogiri 1.6.6.2, but gem install nokogiri would install the latest. Try run gem install nokogiri -v '1.6.6.2' to see what the output is.