Jinja: compare items in list in a for loop - jinja2

Question

I've got a list this list
[
{'update': datetime.date(2019, 9, 13), 'initiator': 'john', 'change': 'name', 'old_value': 'smith', 'new_value': 'baker'},
{'update': datetime.date(2019, 9, 13), 'initiator': 'john', 'change': 'name', 'old_value': 'baker', 'new_value': 'ford'},
{'update': datetime.date(2019, 10, 25), 'initiator': 'paul', 'change': 'country', 'old_value': 'berlin', 'new_value': 'paris'},
{'update': datetime.date(2019, 10, 25), 'initiator': 'john', 'change': 'status', 'old_value': 'hired', 'new_value': 'fired'}
]
In my template, the list should be displayed in such a way that the date comes first and below all changes to the date.
A new section should be created for a new date:
2019-9-13
john | name | smith | baker
john | name | baker | ford
2019-10-25
paul | country | berlin | paris
john | status | hired | fired
I already tried to loop the list and count the loop.index to compare the actual update to the next update in the loop
{% for line in history %}
{% if loop.index != loop.length %}
{% if loop.first %}
{{ line.update }} <br>| {{ line.initiator }} | {{ line.change }} | {{ line.old_value }} | {{ line.new_value }} <br>
{% elif history[loop.index].update == history[loop.index + 1].update %}
| {{ line.initiator }} | {{ line.change }} | {{ line.old_value }} | {{ line.new_value }} <br>
{% elif history[loop.index].update != history[loop.index + 1].update %}
{{ line.update }} <br>| {{ line.initiator }} | {{ line.change }} | {{ line.old_value }} | {{ line.new_value }} <br>
{% endif %}
{% else %}
{% if history[loop.index].update == history[loop.index - 1].update%}
| {{ line.initiator }} | {{ line.change }} | {{ line.old_value }} | {{ line.new_value }} <br>
{% else %}
{{ line.update }} <br>| {{ line.initiator }} | {{ line.change }} | {{ line.old_value }} | {{ line.new_value }} <br>
{% endif %}
{% endif %}
{% endfor %}
It's not working.
My next idea was to declare a value to safe the recent date and compare it to the next one in the loop.
{% for line in history %}
{% if loop.first %}
{% set date = line.update %}
{{ line.update }} <br>| {{ line.initiator }} | {{ line.change }} | {{ line.old_value }} | {{ line.new_value }} <br>
{% else %}
{% if date == line.update %}
| {{ line.initiator }} | {{ line.change }} | {{ line.old_value }} | {{ line.new_value }} <br>
{% else %}
{% set date = line.update %}
{{ line.update }} <br>| {{ line.initiator }} | {{ line.change }} | {{ line.old_value }} | {{ line.new_value }} <br>
{% endif %}
{% endif %}
{% endfor %}
Maybe someone has an advice or a hint for me.
Thanks a lot!

Answer 1

Okay, sometime you just need some sleep :-)
This does exactly what I want:
{% set date = history[0].update %}
{% for line in history %}
{% if loop.first %}
{{ line.update }}<br>
{{ line.initiator }} | {{ line.change }} | {{ line.old_value }} | {{ line.new_value }}
{% else %}
{% if date == line.update %}
<br> {{ line.initiator }} | {{ line.change }} | {{ line.old_value }} | {{ line.new_value }}
{% else %}
{% set date = line.update %}
<br><br>{{ line.update }}<br>
{{ line.initiator }} | {{ line.change }} | {{ line.old_value }} | {{ line.new_value }}
{% endif %}
{% endif %}
{% endfor %}