setup_initial_database_yaml

# File activerecord/lib/active_record/tasks/database_tasks.rb, line 140
      def setup_initial_database_yaml
        return {} unless defined?(Rails)

        begin
          Rails.application.config.load_database_yaml
        rescue
          unless ActiveRecord.suppress_multiple_database_warning
            $stderr.puts "Rails couldn't infer whether you are using multiple databases from your database.yml and can't generate the tasks for the non-primary databases. If you'd like to use this feature, please simplify your ERB."
          end

          {}
        end
      end