Rails 7 primary is now AR::Base

Fixes deprecation in rails 6.1:
"primary"` has been deprecated as the `connection_specification_name` for `ActiveRecord::Base` in favor of using `"ActiveRecord::Base"`. This change affects calls to `ActiveRecord::Base.connection_handler.retrieve_connection` and `ActiveRecord::Base.connection_han
dler.remove_connection`. If you're calling these methods with `"primary"`, please switch to `"ActiveRecord::Base".

spec/spec_helper.rb

@@ -88,7 +88,12 @@
   # Necessary because you currently cannot specify the
   # connection name for ActiveRecord::Schema, which we use
   # in tests to reset db schema for different RHEV versions.
-  c.connection_specification_name = 'primary' if ActiveRecord::VERSION::MAJOR >= 5
+  case ActiveRecord::VERSION::MAJOR
+  when 7
+    c.connection_specification_name = 'ActiveRecord::Base'
+  else
+    c.connection_specification_name = 'primary'
+  end
 end
 ActiveRecord::Base.establish_connection :adapter => "sqlite3", :database => ":memory:"