Django 8 通用视图基础

2024-01-07 17:10:53

1. 什么是通用视图?

1. 在terminal 输入?django-admin startapp the_12回车

2. tutorial\settings.py 注册?

INSTALLED_APPS = [
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    "the_3",
    "the_5",
    "the_6",
    "the_7",
    "the_8",
    "the_9",
    "the_10",
    "the_12",
]

3.? tutorial\urls.py

urlpatterns = [
    path('admin/', admin.site.urls),
    path('the_3/', include('the_3.urls')),
    path('the_4/', include('the_4.urls')),
    path('the_5/', include('the_5.urls')),
    path('the_7/', include('the_7.urls')),
    path('the_10/', include('the_10.urls')),
    path('the_12/', include('the_12.urls')),
]

4. the_12\views.py

from django.http import JsonResponse
from django.shortcuts import render
from django.views import View

# Create your views here.

class Chello(View):
    def get(self,request):
        return JsonResponse({"python": '这是一个get方法'})

    def post(self,request):
        return JsonResponse({"python": '这是一个post方法'})

5. the_12\urls.py?

from django.urls import path
from .views import Chello

urlpatterns = [
    path('index/', Chello.as_view()),
]

6. 运行tutorial, 点击http://127.0.0.1:8000/，地址栏?127.0.0.1:8000/the_12/index/?刷新?

7. 回到the_12\urls.py, 看as_view的源码（ctrl + 点鼠标左键）

2.使用通用视图的tips

提供了什么功能
数据从哪里来
提供了哪些模板变量
渲染的模板页

3.ListView 的使用?

如何自定义获取到的列表对象的名字
如何确定渲染的模板名字
如何分页展示

1. the_12\models.py?

from django.db import models

# Create your models here.

class SomeThing(models.Model):
    msg = models.CharField(max_length=200)
    is_delete = models.BooleanField()

2. 迁移， terminal 输入?python .\manage.py makemigrations回车

Migrations for 'the_12':
? the_12\migrations\0001_initial.py
? ? - Create model SomeThing

3. terminal 输入?python .\manage.py migrate回车?

Operations to perform:
? Apply all migrations: admin, auth, contenttypes, sessions, the_10, the_12, the_6, the_8, the_9
Running migrations:
? Applying the_12.0001_initial... OK

4. the_12\admin.py?

from django.contrib import admin
from the_12.models import SomeThing

# Register your models here.

admin.site.register(SomeThing)

5.?浏览器 http://127.0.0.1:8000/admin在SomeThing添加5条数据?

6. the_12\views.py 添加以下代码

class MyListView(ListView):
    pass

7. the_12\urls.py?

from django.urls import path
from .views import Chello,MyListView

urlpatterns = [
    path('index/', Chello.as_view()),
    # path 的第二个参数应该是一个函数，as_view就是把Chello这个类变成函数
    path('mylist/', MyListView.as_view()),
]

8. 浏览器?ImproperlyConfigured at /the_12/mylist/

9. the_12\views.py?

from django.http import JsonResponse
from django.shortcuts import render
from django.views import View
from django.views.generic import ListView
from .models import SomeThing

# Create your views here.

class Chello(View):
    def get(self,request):
        return JsonResponse({"python": '这是一个get方法'})

    def post(self,request):
        return JsonResponse({"python": '这是一个post方法'})

class MyListView(ListView):
    model = SomeThing

10. 刷新网页?

11. 在templates创建the_12文件夹，再在新创建的the_12文件夹内创建一个something_list。html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <h1>这是something_list的页面</h1>
</body>
</html>

12. 刷新网页?

13. templates\the_12\something_list.html?

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <h1>这是something_list的页面</h1>
    <ul>
        {% for i in object_list %}
        <li>{{ i.msg }}</li>
        {% endfor %}
    </ul>
</body>
</html>

14. 刷新网页?

15. 总结?

"""
提供了什么功能
    以列表的形式展示数据的功能
数据从哪里来
    数据从数据库中查询得来的
    model
    queryset
    get_queryset
提供了哪些模板变量
    object_list
    自定义 : context_object_name
    something_list
渲染的模板页
    默认
    模型名的小写_list.html
    自定义:template_name
"""

the_12\views.py?

from django.http import JsonResponse
from django.shortcuts import render
from django.views import View
from django.views.generic import ListView
from .models import SomeThing

# Create your views here.

class Chello(View):
    def get(self,request):
        return JsonResponse({"python": '这是一个get方法'})

    def post(self,request):
        return JsonResponse({"python": '这是一个post方法'})

class MyListView(ListView):
    # model = SomeThing
    # queryset = SomeThing.objects.all()
    def get_queryset(self):
        queryset = SomeThing.objects.filter(is_delete=0)
        return queryset

    context_object_name = 'panda'
    template_name = 'the_12/huahua.html'

templates\the_12\something_list.html?

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <h1>这是something_list的页面</h1>
    <ul>
        {% for i in object_list %}
        <li>{{ i.msg }}</li>
        {% endfor %}
    </ul>
</body>
</html>

templates\the_12\huahua.html?

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <h1>这是huahua的页面</h1>
    <ul>
        {% for i in object_list %}
        <li>{{ i.msg }}</li>
        {% endfor %}
    </ul>
</body>
</html>

16. 分页操作， the_12\views.py

class MyListView(ListView):
    paginate_by = 2

templates\the_12\huahua.html?

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <h1>这是huahua的页面</h1>
    <ul>
        {% for i in object_list %}
        <li>{{ i.msg }}</li>
        {% endfor %}
    </ul>
    {% for page in paginator %}
        <a href="">{{ page.number }}</a>
    {% endfor %}
</body>
</html>

刷新网页?

17. the_12\urls.py, 做以下更改?

path('mylist/', MyListView.as_view(),name='something')

18.?templates\the_12\huahua.html?

{% for page in paginator %}
        <a href="{% url 'something' %}">{{ page.number }}</a>
    {% endfor %}

相当于?templates\the_12\huahua.html

{% for page in paginator %}
    <a href="{% url 'something' %}?page={{ page.number }}">{{ page.number }}</a>
{% endfor %}

19. 源码分析?

class MyListView(ListView):

class ListView(MultipleObjectTemplateResponseMixin, BaseListView):

class MultipleObjectTemplateResponseMixin(TemplateResponseMixin):

? ? ? ? the_12/something_list.html

????????自定义了模板名，供程序使用

class TemplateResponseMixin:

? ? ? ? 主要的作用是找到模板的名字，然后渲染上下文数据

class BaseListView(MultipleObjectMixin, View):

? ? ? ? 重写了get方法

class MultipleObjectMixin(ContextMixin):? ??

????????queryset = None
????????model = None
????????paginate_by = None
????????paginate_orphans = 0
????????context_object_name = None

4.常见通用视图可自定义属性

文章来源:https://blog.csdn.net/April123abc/article/details/135377931
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