如何在 Jinja2 模板 Django 中计算循环“for in”中的所有元素

Question

我尝试使用循环：

user_list = <QuerySet [<TableUsers: Jane>, <TableUsers: Kate>, <TableUsers: Jons>, <TableUsers: Jacob>, <TableUsers: Jane>, <TableUsers: Jons>, <TableUsers: Jane>]>

{% for user in user_list %}
  {% if user.name == "Jane" %}
    {{all_count_username_jane}} # this is all count user with name Jane
    {{user.name}}
  {% elif user.name == "Jons" %}
    {{all_count_username_jons}} # this is all count user with name Jons
    {{user.name}}
  {% endif %}
{% endfor %}

如何计算所有“Jane”和“Jons”？

Answer 1

如果你用过user_list = SomeModel.objects.all()之类的东西，你可以用类似的东西替换它

from django.db.models import Count

user_list = SomeModel.objects.values('name').annotate(count_names=Count('id'))

然后还将您的模板代码更改为：

{% for user in user_list %}
  {% if user.name == "Jane" %}
    {{user.count_names}} # this is all count user with name Jane
    {{user.name}}
  {% elif user.name == "Jons" %}
    {{user.count_names}} # this is all count user with name Jons
    {{user.name}}
  {% endif %}
{% endfor %}