How to display data grouped by dates on the page?

Question

Django

Good time of the day!
There is a model:

class Data(models.Model):

  date_ready = models.DateField('На дату')
  body = models.TextField('Задание по предмету', default='Не установлено')
  subject = models.ForeignKey('Subjects', verbose_name='Предмет')

You need to display data on the page as follows:
Date: dmY (latest)
------------------------------------ -----------------
- subject body 1
- subject body 2
...
Date: dmY (penultimate)
---------------- ------------------------------
...
etc.
That is, first the output of the date, and then the rest of the fields related to this date without the date itself. That is grouping around the date. Where (in the model, view or template) and how best to do it?
Thanks in advance.

Answer 1

Look towards the regroup template tag - djbook.ru/rel1.8/ref/templates/builtins.html#regroup
In views.py
In templates

{% regroup data by date_ready as data_by_date %}

<ul>
{% for data in data_by_date %}
    <li>{{ data.grouper }}
    <ul>
        {% for item in data.list %}
          <li>{{ item.subject  }} {{ item.body }}</li>
        {% endfor %}
    </ul>
    </li>
{% endfor %}
</ul>