Gem::Gem Not Found Exception - ruby

Question

My pull request keep failing on linters with this Ruby gem error:
Run[ -f Gemfile ] && bundle --deployment
gem install --no-document rspec:'~>3.0'
shell: /bin/bash -e {0}/opt/hostedtoolcache/Ruby/2.6.6/x64/lib/ruby/2.6.0/rubygems.rb:283:in
`find_spec_for_exe': Could not find 'bundler' (2.1.2) required by your
/home/runner/work/Telegram_Inspirational_Bot/Telegram_Inspirational_Bot/Gemfile.lock. (Gem::GemNotFoundException)
To update to the latest version installed on your system, run `bundle update --bundler`.To install the missing version, run `gem install bundler:2.1.2`from/opt/hostedtoolcache/Ruby/2.6.6/x64/lib/ruby/2.6.0/rubygems.rb:302:in`activate_bin_path'from/opt/hostedtoolcache/Ruby/2.6.6/x64/bin/bundle:23:in `<main>'Error: Process completed with exit code 1.
Screenshot CI
And my client can't run my app
My client can't run my app. I'm sure it's because of this error. He's getting this error after making a pull request:
The error:
bundle install
Fetching gem metadata from https://rubygems.org/.........
Resolving dependencies...
Bundler could not find compatible versions for gem "bundle exec rspec":
In Gemfile:
telegram-bot-ruby was resolved to 0.13.0, which depends on
virtus was resolved to 1.0.5, which depends on
bundle exec rspec
Could not find gem 'bundle exec rspec', which is required by gem 'virtus', in any of the sources.
I really can't figure out the issue as initially I thought it was a bug from the gem file.
Gem file:
source 'https://rubygems.org'
git_source(:github) { |repo_name| "https://github.com/#{repo_name}" }
# gem "rails"
gem 'json'
gem 'net-http-persistent', '~> 2.9', '>= 2.9.4'
gem 'rubocop', '~>0.81.0'
gem 'telegram-bot-ruby'
Gem file lock:
GEM
remote: https://rubygems.org/
specs:
axiom-types (0.1.1)
descendants_tracker (~> 0.0.4)
ice_nine (~> 0.11.0)
thread_safe (~> 0.3, >= 0.3.1)
coercible (1.0.0)
descendants_tracker (~> 0.0.1)
descendants_tracker (0.0.4)
thread_safe (~> 0.3, >= 0.3.1)
equalizer (0.0.11)
faraday (1.1.0)
multipart-post (>= 1.2, < 3)
ruby2_keywords
ice_nine (0.11.2)
inflecto (0.0.2)
json (2.3.1)
multipart-post (2.1.1)
net-http-persistent (2.9.4)
ruby2_keywords (0.0.2)
telegram-bot-ruby (0.13.0)
faraday
inflecto
virtus
thread_safe (0.3.6)
virtus (1.0.5)
axiom-types (~> 0.1)
coercible (~> 1.0)
descendants_tracker (~> 0.0, >= 0.0.3)
equalizer (~> 0.0, >= 0.0.9)
PLATFORMS
ruby
DEPENDENCIES
json
net-http-persistent (~> 2.9, >= 2.9.4)
telegram-bot-ruby
BUNDLED WITH
2.1.4

Answer 1

I think there are two issues here.
Bundler is not installed (or the wrong version is installed)
Whatever system is running the tests / linter (appears to be Github's CI tool) doesn't have the correct version of bundler installed. Try adding
gem install bundler:2.1.2
to the job invoking your test suite.
RSpec is not included in the Gemfile
RSpec is a required dependency. It appears you're installing rspec in the test job, but it isn't included in your Gemfile. Try adding
gem 'rspec'
to your Gemfile.

Answer 2

The issue was on the linter.yml that I was using.
A friend of mine recently solve the issue by modifying the linter.yml from:
name: Linters
on: pull_request
jobs:
rubocop:
name: Rubocop
runs-on: ubuntu-18.04
steps:
- uses: actions/checkout#v2
- uses: actions/setup-ruby#v1
with:
ruby-version: 2.6.x
- name: Setup Rubocop
run: |
gem install --no-document rubocop:'~>0.81.0' # https://docs.rubocop.org/en/stable/installation/
[ -f .rubocop.yml ] || wget https://raw.githubusercontent.com/microverseinc/linters-config/master/ruby/.rubocop.yml
- name: Rubocop Report
run: rubocop --color
To:
name: Tests
on: pull_request
jobs:
rspec:
name: RSpec
runs-on: ubuntu-18.04
steps:
- uses: actions/checkout#v2
- uses: actions/setup-ruby#v1
with:
ruby-version: 2.6.x
- name: Setup Bundler
run: gem install bundler:2.1.4
- name: Setup RSpec
run: |
[ -f Gemfile ] && bundle --deployment
gem install --no-document rspec:'~>3.0'
- name: RSpec Report
run: rspec --force-color --format documentation
The latter worked.