如何在 Django 中进行复杂查询？

Question

大家好！

Django 中的新手，很困惑，感谢帮助！我正在尝试创建一个表，例如：

Organization	Appeal Form	Amount of appeals in this form
Organization 1	In written form	1
Organization 2	In oral form	1

拥有三个模型：

class Organization(models.Model):
    organization_name = models.CharField(max_length=50)


class AppealForm(models.Model):
    form_name = models.CharField(max_length=50)


class Appeal(models.Model):
    organization = models.ForeignKey(Organization, on_delete=models.CASCADE)
    appeal_form = models.ForeignKey(AppealForm, on_delete=models.CASCADE)
    applicant_name = models.CharField(max_length=150)

组织模型的对象：

organization_name
Organization 1
Organization 2

AppealForm模型的对象：

form_name
In written form
In oral form

上诉模型的对象：

organization	appeal_form	applicant_name
Organization 1	In written form	Mary Elizabeth Smith
Organization 2	In oral form	Ada María Guerrero

如何进行复杂查询，从 Appeal 模型中检索信息？并放置到上表的确切字段？:(

############################################## ############################

index.html 中的新表

Organization	Total amount of appeals	Amount of written form appeals	Amount of oral form appeals
Organization 1	10	1	9
Organization 2	5	4	1

Answer 1

我创建了一个页面应用程序。看看模板在哪里。

views.py

from django.shortcuts import render
from .models import Appeal
from django.db.models import Count


def index(request):
    qs = Appeal.objects.values(
        "organization__organization_name", "appeal_form__form_name"
    ).annotate(total=Count("appeal_form__form_name"))
    context = {
        "appeal": qs,
    }
    return render(request, "pages/index.html", context)

index.html

<table>
    <tr>
        <th>Organization</th>
        <th>Appeal Form</th>
        <th>Amount of appeals in this form</th>
    </tr>
{% for item in appeal %}
<tr>
    <td>{{ item.organization__organization_name }}</td>
    <td>{{ item.appeal_form__form_name }}</td>
    <td>{{ item.total }}</td>
</tr>
{% endfor %}
</table>

pages
├── __init__.py
├── admin.py
├── apps.py
├── migrations
├── models.py
├── templates
│   └── pages
│       └── index.html
├── tests.py
├── urls.py
└── views.py