trying to render new or newline depending on what current page is currently viewed

this is what i tried

  def create
    @karretlink = Karretlink.new(params[:karretlink])

    respond_to do |format|
      if @karretlink.save
        format.html { redirect_to @karretlink, notice: 'Your Karret was successfully created.' }
        format.json { render json: @karretlink, status: :created, location: @karretlink }
      else
        flash.now.alert = "Something went wrong, Make sure to fill up everything. ( Make sure Karet's name have no space or special symbol)" 
        current_uri = request.env['PATH_INFO']
        if current_uri == new_path
          # format.html {render action: "new"}
          format.json { render json: @karretlink.errors, status: :unprocessable_entity }
        elsif current_uri == newlink_path
          format.html {render action: "newlink"}
          format.json { render json: @karretlink.errors, status: :unprocessable_entity }
        end
      end
    end
  end