select_database

# File activerecord/lib/active_record/middleware/database_selector.rb, line 59
        def select_database(request, &blk)
          context = context_klass.call(request)
          resolver = resolver_klass.call(context, options)

          if reading_request?(request)
            resolver.read(&blk)
          else
            resolver.write(&blk)
          end
        end