xppl/app/templates/show_book_detail.html

{% extends 'base.html' %}

{% block main %}
<div class="container">

  <h1 class="header">{{ book.title }}</h1>
  <img class="no_cover" id="{{ book.title }}" src="../uploads/cover/{{ book.cover }}" width="150" onerror="if (this.src != '../static/img/{{ book.cover }}') this.src = '../static/img/default_cover.png';">
  <p>Author(s): <ul>{% for author in book.authors %}

              <li><a href="{{url_for('show_author_by_id', id=author.id)}}">{{ author.author_name }}</a>  </li>

        {% endfor %}</ul></p>

<p>Category: {{ book.category }}</p>
<p>Year published: {{ book.year_published }}</p>

        <p>Stack(s): <ul>{% for stack in book.stacks %}
          <li><a href="{{url_for('show_stack_by_id', id=stack.id)}}">{{ stack.stack_name }}</a>

             {% endfor %}</ul></p>

  <a href="../uploads/{{ book.file }}">download {{ book.fileformat }}</a>
  <br>
  <br>
  <p>Instances:</p>
  {% set got = {} %}
  {% set all = 1 %}
  {% for instance in book.instances %}

  {% if instance.name in got %}
  {% set x=got.__setitem__(instance.name, got[instance.name]+1) %}
  {% else %}
  {% set x=got.__setitem__(instance.name, 1) %}
  {% endif %}
  {% set all = loop.index %}
  {% endfor %}

  {% for instance, value in got.items() %}
    {% set result = value/(book.instances|length) %}
    {{ instance }}: {{ (result*100)|round|int }}%<br>
  {% endfor %}
  <br>
  <br>
    <a href="{{ url_for('edit_book_by_id', id=book.id )}}">edit</a>

</div>
{% endblock %}