【Flask WEBアプリ制作】 flash フィードバック

https://msiz07-flask-docs-ja.readthedocs.io/ja/latest/patterns/flashing.html

単にflash(‘You were successfully logged in’) をviews.pyに挿入した場合これでok

{% with messages = get_flashed_messages() %}
  {% if messages %}
    <ul class=flashes>
    {% for message in messages %}
      <li>{{ message }}</li>
    {% endfor %}
    </ul>
  {% endif %}
{% endwith %}

flash(‘You were successfully logged in’, ‘feedback’) 引数でカテゴリ指定した場合

{% with feedback = get_flashed_messages(category_filter=["feedback"]) %}
{% if feedback %}
<div class="message block-message feedback">
  <a class="close" href="#">×</a>
  <ul>
    {%- for msg in feedback %}
    <li>{{ msg }}</li>
    {% endfor -%}
  </ul>
</div>
{% endif %}
{% endwith %}