Fix support for dbconsole on Rails edge

Ref:
- Move dbconsole logic to Active Record connection adapter: rails/rails@4bcb8e4 rails/rails#46093
- Use adapter_class instead of connection_class for adapters: rails/rails@5bb357f rails/rails#46166

lib/active_record/connection_adapters/chronomodel_adapter.rb

@@ -2,6 +2,9 @@
 
 module ActiveRecord
   module ConnectionHandling
+    def chronomodel_adapter_class
+      ConnectionAdapters::PostgreSQLAdapter
+    end
 
     # Install the new adapter in ActiveRecord. This approach is required because
     # the PG adapter defines +add_column+ itself, thus making impossible to use

lib/chrono_model.rb

@@ -77,7 +77,7 @@ def chrono?
   prepend ChronoModel::Patches::Batches::BatchEnumerator
 end
 
-if defined?(Rails::DBConsole)
+if defined?(Rails::DBConsole) && Rails.version < '7.1'
   Rails::DBConsole.instance_eval do
     if Rails.version < '6.1'
       prepend ChronoModel::Patches::DBConsole::Config

lib/chrono_model/time_machine.rb

@@ -38,7 +38,7 @@ def subclasses
           # implemented with recursion of subclasses
           if Class.method_defined?(:subclasses)
             def descendants_with_history
-              subclasses_with_history.concat(subclasses.flat_map(&:descendants))
+              subclasses_with_history.concat(subclasses.flat_map(&:descendants_with_history))
             end
           end
         else

spec/chrono_model/time_machine/sti_spec.rb

@@ -33,7 +33,7 @@ class ::Magazine < ::Publication
   describe '.descendants_with_history' do
     subject { Element.descendants_with_history.map(&:name) }
 
-    it { is_expected.to match_array %w[Element::History Publication Magazine] }
+    it { is_expected.to match_array %w[Element::History Publication Publication::History Magazine Magazine::History] }
   end
 
   if Element.respond_to?(:direct_descendants)
@@ -50,7 +50,7 @@ class ::Magazine < ::Publication
     end
   end
 
-  if Element.respond_to?(:subclasses)
+  if Rails.version >= '7.0'
     describe '.subclasses' do
       subject { Element.subclasses.map(&:name) }