Merge pull request #5339 from ghiculescu/rails-deprecation

Fix deprecation warning on Rails 6.1

Related changes in Rails:
rails/rails#38256
rails/rails#38536

lib/generators/active_record/devise_generator.rb

@@ -86,9 +86,24 @@ def rails5_and_up?
         Rails::VERSION::MAJOR >= 5
       end
 
+      def rails61_and_up?
+        Rails::VERSION::MAJOR > 6 || (Rails::VERSION::MAJOR == 6 && Rails::VERSION::MINOR >= 1)
+      end
+
       def postgresql?
-        config = ActiveRecord::Base.configurations[Rails.env]
-        config && config['adapter'] == 'postgresql'
+        ar_config && ar_config['adapter'] == 'postgresql'
+      end
+
+      def ar_config
+        if ActiveRecord::Base.configurations.respond_to?(:configs_for)
+          if rails61_and_up?
+            ActiveRecord::Base.configurations.configs_for(env_name: Rails.env, name: "primary").configuration_hash
+          else
+            ActiveRecord::Base.configurations.configs_for(env_name: Rails.env, spec_name: "primary").config
+          end
+        else
+          ActiveRecord::Base.configurations[Rails.env]
+        end
       end
 
      def migration_version