以下学习 朔宁夫 开发课 。（Python）
一 基本使用
创建超级用户 terminal //
python manage.py createsuperuser
访问地址 //Log in | Django site admin
http://127.0.0.1:8000/admin/login/?next=/admin/
superuserr login
django自带admin功能。其中group与permission可见是两张manyTOmanyField关系的表 //
setting中的时区主要用于记录admin_log。
以下延用model_app
model_app admin.py //
from django.contrib import adminfrom model_app.models import Course, Student, Relationmodels = [Course, Student, Relation,
]admin.site.register(models)再回到8000端口的admin页面即可见上述自己选择性注册的一些表。默认为objectname+编号，models定义类时作注释可改变展示的字段：
class Student(models.Model):xxxdef __str__(self):return self.nameclass Relation(models.Model):xxxdef __str__(self):return f"{self.student.name} - {self.course.name}"
model中注释meta可修改admin页面表名的展示方式，attribute中指定verbose_name可对属性名注释：
class Course(models.Model):name = models.CharField(max_length=32, verbose_name="showASKECHENG")class Meta:verbose_name = "课程"verbose_name_plural = verbose_name + 'Ss'二 后台管理权限
dmin页面，可在group中将一些table&读写状态作组合，所得group即不同程度的权限，可赋给某个新建的user。
三 分页器
使用方法：
from django.core.paginator import Paginator
实例化分页器对象：
paginator = Paginator(数据源，每页最多显示的条数)
演示：
terminal // python manage.py startapp page_app
setting // install
total url//
path('page/', include('page_app.urls', namespace="page")),models //
from django.db import modelsclass Index(models.Model):name = models.CharField(max_length=32, verbose_name="statistical index")category = models.CharField(max_length=32, verbose_name="application field")preference = models.FloatField(verbose_name="subjective recommendation degree")description = models.CharField(max_length=128, verbose_name="brief documentation", null=True)def __str__(self):return f"{self.name}_{self.category}"class Meta:verbose_name = "Index"verbose_name_plural = verbose_name + 'es'@classmethoddef get_list(cls, **kwargs):filters = {}return cls.objects.filter(**filters) # objects.all()注册表单到admin主页，添加测试数据//
from django.contrib import adminfrom page_app.models import Indexmodels = [Index,
]admin.site.register(models)views //
from django.shortcuts import render
from django.core.paginator import Paginator, InvalidPagefrom djangoProject.settings import PAGE_SIZE
from page_app.models import Indexdef list_index(request):page_num = request.GET.get("page_num", default=1) # 页码 可以通过/?page=k传参，路由与视图函数不必维护paramindexes = Index.get_list() # <queryset>paginator = Paginator(indexes, PAGE_SIZE)try:data = paginator.page(page_num)except InvalidPage:data = paginator.page(1)return render(request, "staticindex.html", {"data": data, "paginator": paginator})# 记得不要locals().减少缓存中的数据量。setting //
# 设置分页大小
PAGE_SIZE = 3templates //
<body>
<table><thead><tr><th>Name</th><th>Category</th><th>Personal Preference</th><th>Description</th></tr></thead><tbody>{% for i in data %}<tr><td>{{ i.name }}</td><td>{{ i.category }}</td><td>{{ i.preference }}</td><td>{{ i.description }}</td></tr>{% endfor %}</tbody>
</table>
<center><a href="{% url 'page:list' %}">First</a> <!-- OR , EQUAL, %}?page_num=1-->{% if data.has_previous %}<a href="{% url 'page:list'%}?page_num{{ data.previous_page_number }}">Previous</a>{% else %}<a href="javascript:alert('No previous.')">Next</a>{% endif %}{% if data.has_next %}<a href="{% url 'page:list' %}?page_num={{ data.next_page_number }}">Next</a>{% else %}<a href="javascript:alert('WE reached the End of Universe.')">Next</a>{% endif %}<a href="{% url 'page:list' %}?page_num={{ paginator.num_pages }}">Last</a>
</center>
</body>sub urls //
from django.urls import path
from .views import *app_name = "page"urlpatterns = [path('indexes/', list_index, name="list"),
]
分页前，可传参查询页面：
分页后：
![[牛客周赛复盘] 牛客周赛 Round 28 20240114](http://pic.xiahunao.cn/[牛客周赛复盘] 牛客周赛 Round 28 20240114)
)
