ActiveRecord::Base.configurations in edge returns Symbol key

`ActiveRecord::Base.configurations` in edge rails returns Symbol key.
And I watched the following discussion.
amatsuda#70 (comment)
I was referring to this comment as well.

lib/database_rewinder.rb

@@ -16,11 +16,22 @@ def database_configuration
     end
 
     def create_cleaner(connection_name)
-      config = database_configuration[connection_name] or raise %Q[Database configuration named "#{connection_name}" is not configured.]
+      config = get_connection(connection_name) or raise %Q[Database configuration named "#{connection_name}" is not configured.]
 
       Cleaner.new(config: config, connection_name: connection_name, only: @only, except: @except).tap {|c| @cleaners << c}
     end
 
+    def get_connection(connection_name)
+      return database_configuration[connection_name] unless database_configuration.respond_to?(:configs_for)
+
+      config_hash = database_configuration.configs_for(env_name: connection_name).first
+      if config_hash.respond_to?(:configuration_hash)
+        config_hash.configuration_hash
+      else
+        database_configuration[connection_name]
+      end
+    end
+
     def [](connection)
       @cleaners.detect {|c| c.connection_name == connection} || create_cleaner(connection)
     end
@@ -91,6 +102,7 @@ def get_cache_key(connection_pool)
     end
   end
 
+  private_class_method :get_connection
   private_class_method :get_cache_key
 end
 

lib/database_rewinder/cleaner.rb

@@ -14,7 +14,7 @@ def initialize(config: nil, connection_name: nil, only: nil, except: nil)
     end
 
     def db
-      config['database']
+      config.fetch('database') { config[:database] }
     end
 
     def clean(multiple: true)