Get CI passing on Rails main again (#482)

Fixes:

- Require Ruby >= 3.1
- Require rspec-rails >= 6.0.2
- Call #inspect on Relation#explain to ensure we have a string

.github/workflows/ci.yml

@@ -35,10 +35,16 @@ jobs:
           - ruby: '3.0'
             gemfile: rails_5_2
 
-          # Rails 7 requires Ruby 2.7 or higher
+          # Rails 8 requires Ruby 3.1 or higher
           - ruby: '2.6'
             gemfile: rails_main
 
+          - ruby: '2.7'
+            gemfile: rails_main
+
+          - ruby: '3.0'
+            gemfile: rails_main
+
           - ruby: '2.6'
             gemfile: rails_7_0
 
@@ -89,13 +95,19 @@ jobs:
           - ruby: '3.0'
             gemfile: rails_5_2
 
-          # Rails 7 requires Ruby 2.7 or higher
+          # Rails 8 requires Ruby 3.1 or higher
           - ruby: '2.6'
             gemfile: rails_main
 
+          - ruby: '2.7'
+            gemfile: rails_main
+
+          - ruby: '3.0'
+            gemfile: rails_main
+
           - ruby: '2.6'
             gemfile: rails_7_0
-            
+
           - ruby: '2.6'
             gemfile: rails_7_1
     env:
@@ -158,15 +170,21 @@ jobs:
           - ruby: '3.0'
             gemfile: rails_5_2
 
-          # Rails 7 requires Ruby 2.7 or higher
+          # Rails 8 requires Ruby 3.1 or higher
           - ruby: '2.6'
-            gemfile: rails_7_0
-
+            gemfile: rails_main
+
+          - ruby: '2.7'
+            gemfile: rails_main
+
+          - ruby: '3.0'
+            gemfile: rails_main
+
           - ruby: '2.6'
-            gemfile: rails_7_1
+            gemfile: rails_7_0
 
           - ruby: '2.6'
-            gemfile: rails_main
+            gemfile: rails_7_1
     env:
       BUNDLE_GEMFILE: ${{ github.workspace }}/gemfiles/${{ matrix.gemfile }}.gemfile
       BUNDLE_PATH_RELATIVE_TO_CWD: true

Appraisals

@@ -6,4 +6,5 @@ end
 
 appraise "rails-main" do
   gem "rails", github: "rails/rails", branch: "main"
+  gem "rspec-rails", "~> 6.0.2"
 end

gemfiles/rails_main.gemfile

@@ -3,6 +3,7 @@
 source "https://rubygems.org"
 
 gem "rails", github: "rails/rails", branch: "main"
+gem "rspec-rails", "~> 6.0.2"
 
 platforms :ruby do
   gem "sqlite3"

spec/awesome_nested_set_spec.rb

@@ -1225,13 +1225,13 @@ def check_structure(entries, structure)
     it "should sort by custom sort column" do
       expect(OrderedCategory.acts_as_nested_set_options[:order_column]).to eq('name')
       expect(OrderedCategory.order_column_name).to eq('name')
-      expect(OrderedCategory.first.children.explain).to include('ORDER BY name')
+      expect(OrderedCategory.first.children.explain.inspect).to include('ORDER BY name')
     end
 
     it "should sort by custom hash sort" do
       expect(HashOrderedCategory.acts_as_nested_set_options[:order_column]).to eq({ :name => :desc })
       expect(HashOrderedCategory.order_column_name).to eq({ :name => :desc })
-      expect(HashOrderedCategory.first.children.explain).to include(
+      expect(HashOrderedCategory.first.children.explain.inspect).to include(
         "ORDER BY #{HashOrderedCategory.quoted_table_name}.#{HashOrderedCategory.connection.quote_column_name(:name)} DESC"
       )
     end