Be clear about supported Rails and Ruby versions

[Ruby 2.7 and older] is end of life.

[Rails 6.0 and older] is end of life.

Rails 6 [requires] Ruby >= 2.5, Rails 7 requires Ruby >= 2.7.

[Ruby 2.7 and older]: https://www.ruby-lang.org/en/downloads/branches/
[Rails 6.0 and older]: https://guides.rubyonrails.org/maintenance_policy.html
[requires]: https://guides.rubyonrails.org/upgrading_ruby_on_rails.html#ruby-versions

---

Don't require debug. This isn't needed for tests. But moreover, it
causes an error on Ruby 3.0.

It opens with:

``ruby
if $SAFE > 0
  STDERR.print "-r debug.rb is not available in safe mode\n"
  exit 1
end
```

But `$SAFE` is not set, so we get `nil > 0`, and an error.

```
% ruby -rdebug -e 'puts "OK"'
/home/mike/.rubies/ruby-3.0.6/lib/ruby/3.0.0/debug.rb:9:in `<top (required)>': undefined method `>' for nil:NilClass (NoMethodError)
        from <internal:/home/mike/.rubies/ruby-3.0.6/lib/ruby/3.0.0/rubygems/core_ext/kernel_require.rb>:85:in `require'
        from <internal:/home/mike/.rubies/ruby-3.0.6/lib/ruby/3.0.0/rubygems/core_ext/kernel_require.rb>:85:in `require'
```

This is not an issue on Ruby 3.1.

---

Ruby 3.1 + Rails 7.1 leads to an issue around the `error_highlight`
library. Rather than debug that, we can skip that combination and hope
for the best.

.github/workflows/build.yml

@@ -10,22 +10,10 @@ jobs:
       fail-fast: false
       matrix:
         rails: ["7.1", "7.0", "6.1"]
-        ruby: ["3.2", "3.1"]
-        include:
-          - rails: "6.1"
-            ruby: "3.0"
-          - rails: "6.1"
-            ruby: "2.7"
-          - rails: "6.0"
-            ruby: "2.7"
-          - rails: "5.2"
-            ruby: "2.7"
-          - rails: "5.2"
-            ruby: "2.6"
-          - rails: "5.1"
-            ruby: "2.6"
-          - rails: "5.0"
-            ruby: "2.5"
+        ruby: ["3.2", "3.1", "3.0"]
+        exclude:
+          - ruby: "3.1"
+            rails: "7.1"
 
     runs-on: 'ubuntu-latest'
 

Appraisals

@@ -1,44 +1,3 @@
-# These are the versions of Rails we want to test against.
-appraise "rails5.0" do
-  gem "byebug"
-  gem "listen", "~> 3.0.5"
-  gem "puma", "~> 3.0"
-  gem "rails", "~> 5.0.7", ">= 5.0.7.2"
-  gem "spring", "!= 2.1.1"
-  gem "spring-watcher-listen", "~> 2.0.0"
-  gem "sqlite3", "~> 1.3.6"
-end
-
-appraise "rails5.1" do
-  gem "byebug"
-  gem "listen", ">= 3.0.5", "< 3.2"
-  gem "puma", "~> 3.7"
-  gem "rails", "~> 5.1.7"
-  gem "spring", "!= 2.1.1"
-  gem "spring-watcher-listen", "~> 2.0.0"
-  gem "sqlite3", "~> 1.3.6"
-end
-
-appraise "rails5.2" do
-  gem "byebug"
-  gem "listen", ">= 3.0.5", "< 3.2"
-  gem "puma", "~> 3.11"
-  gem "rails", "~> 5.2.4", ">= 5.2.4.2"
-  gem "spring", "!= 2.1.1"
-  gem "spring-watcher-listen", "~> 2.0.0"
-  gem "sqlite3", "~> 1.3.6"
-end
-
-appraise "rails6.0" do
-  gem "byebug"
-  gem "listen", "~> 3.2"
-  gem "puma", "~> 4.1"
-  gem "rails", "~> 6.0.2", ">= 6.0.2.2"
-  gem "spring", "!= 2.1.1"
-  gem "spring-watcher-listen", "~> 2.0.0"
-  gem "sqlite3", "~> 1.4"
-end
-
 appraise "rails6.1" do
   gem "byebug"
   gem "listen", "~> 3.2"
@@ -61,7 +20,6 @@ end
 
 appraise "rails7.1" do
   gem "byebug"
-  gem "error_highlight", ">= 0.4.0"
   gem "listen", "~> 3.2"
   gem "puma", "~> 6.0"
   gem "rails", "~> 7.1.0"

Gemfile.lock

@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    factory_bot_rails (6.4.0)
+    factory_bot_rails (6.4.2)
       factory_bot (~> 6.4)
       railties (>= 5.0.0)
 

Rakefile

@@ -7,7 +7,7 @@ Bundler::GemHelper.install_tasks name: "factory_bot_rails"
 
 Cucumber::Rake::Task.new(:cucumber) do |t|
   t.fork = true
-  t.cucumber_opts = ["--format", (ENV["CUCUMBER_FORMAT"] || "progress")]
+  t.cucumber_opts = ["--format", ENV.fetch("CUCUMBER_FORMAT", "progress")]
 end
 
 RSpec::Core::RakeTask.new(:spec)

features/support/rails_template

@@ -2,7 +2,8 @@ if Rails.gem_version < Gem::Version.new('6')
   gsub_file "Gemfile", /^gem 'sqlite3'$/, 'gem "sqlite3", "~> 1.3.6"'
 end
 
-gsub_file "Gemfile", /^ gem 'spring'$/, ' gem "spring", "!= 2.1.1"'
+gsub_file "Gemfile", /^  gem 'spring'$/, ' gem "spring", "!= 2.1.1"'
+gsub_file "Gemfile", /^  gem "debug".*/, ''
 
 if Rails.gem_version >= Gem::Version.new('7.1')
   append_to_file File.join("config", "application.rb"), <<~RUBY

gemfiles/rails7.1.gemfile

@@ -5,7 +5,6 @@ source "https://rubygems.org"
 gem "appraisal"
 gem "aruba"
 gem "cucumber"
-gem "error_highlight", ">= 0.4.0"
 gem "rake"
 gem "rspec-rails"
 gem "standard"