rails_gemfile_entry

# File railties/lib/rails/generators/app_base.rb, line 421
      def rails_gemfile_entry
        if options.dev?
          GemfileEntry.path("rails", Rails::Generators::RAILS_DEV_PATH, "Use local checkout of Rails")
        elsif options.edge?
          GemfileEntry.github("rails", "rails/rails", edge_branch, "Use specific branch of Rails")
        elsif options.main?
          GemfileEntry.github("rails", "rails/rails", "main", "Use main development branch of Rails")
        else
          GemfileEntry.version("rails", rails_version_specifier,
            %(Bundle edge Rails instead: gem "rails", github: "rails/rails", branch: "main"))
        end
      end