項目啟動時自動生成URL

效果圖：

知識點：

1. Django啟動前通過apps下的ready方法執行一個可以生成URL的py文件
2. include函數主要返回有三個元素的一個元組。第一個是url配置（urlpatterns），第二個是app（app_name），第三個是命名空間（namespace）。
3. 通過單例模式，我們反復操作一個對象。

項目名：stark_practice

業務app：stark

stark app：stark

一、在業務表中生成數據庫

web/models.py

from django.db import models


 
class Department(models.Model):
    """
    部門表
    """
    title = models.CharField(verbose_name=‘部門名稱‘, max_length=32)


class UserInfo(models.Model):
    """
    用戶表
    """
    name = models.CharField(verbose_name=‘姓名‘, max_length=32)
    age = models.CharField(verbose_name=‘年齡‘, max_length=32)
    email 
 
= models.CharField(verbose_name=‘郵箱‘, max_length=32)
    department = models.ForeignKey(verbose_name=‘部門‘, to=‘Department‘, on_delete=models.CASCADE)

二、加載django項目時自動執行stark文件

stark.apps.py

from django.apps import AppConfig
from django.utils.module_loading import autodiscover_modules


 
class StarkConfig(AppConfig):
    name = ‘stark‘

    def ready(self): autodiscover_modules(‘stark‘)  # 執行名為stark的py文件

三、stark組件

stark/service/core_function.py

from django.urls import re_path


class StarkSite(object):
    def __init__(self):
        self._registry = []
        self.app_name = ‘stark‘
        self.namespace = ‘stark‘

    def register(self, model_class, handler_class):
        """
        :param model_class: 是models中的數據庫表對應的類。
        :param handler_class: 處理請求的視圖函數所在的類
        :return:
        """
        """
        self._registry = [
           {‘model_class‘: model.Department,‘handler‘:DepartmentHandler(models.Department)},
           {‘model_class‘: model.UserInfo,‘handler‘:UserInfo(models.UserInfo)}, 
           {‘model_class‘: model.Host,‘handler‘:Host(models.Host)},
        ]
        """
        # 註意：handler_class接收的第一個參數是數據庫表對應的類
        self._registry.append({‘model_class‘: model_class, ‘handler‘: handler_class(model_class)})

    def get_urls(self):
        patterns = []
        for item in self._registry:
            model_class = item[‘model_class‘]
            handler = item[‘handler‘]
            app_name = model_class._meta.app_label  # 獲取當前類所在的app
            model_name = model_class._meta.model_name  # 獲取當前類所在的表名稱
            patterns.append(re_path(r‘%s/%s/list‘ % (app_name, model_name), handler.list_view))
            patterns.append(re_path(r‘%s/%s/add‘ % (app_name, model_name), handler.add_view))
            patterns.append(re_path(r‘%s/%s/edit‘ % (app_name, model_name), handler.edit_view))
            patterns.append(re_path(r‘%s/%s/delete‘ % (app_name, model_name), handler.delete_view))

        return patterns

    @property
    def urls(self):
        return self.get_urls(), self.app_name, self.namespace


site = StarkSite()

四、使用strak組件

web/stark.py

from django.shortcuts import HttpResponse
from stark.service.core_func import site

from web import models


class DepartmentHandler(object):
    def __init__(self, model_class):
        self.model_class = model_class

    def list_view(self, request):
        """
        列表頁面
        :param request:
        :return:
        """
        return HttpResponse(‘列表頁面‘)

    def add_view(self, request):
        """
        添加頁面
        :param request:
        :return:
        """
        return HttpResponse(‘添加頁面‘)

    def edit_view(self, request):
        """
        編輯頁面
        :param request:
        :return:
        """
        return HttpResponse(‘編輯頁面‘)

    def delete_view(self, request):
        """
        刪除頁面
        :param request:
        :return:
        """
        return HttpResponse(‘刪除頁面‘)


class UserInfoHandler:
    def __init__(self, model_class):
        self.model_class = model_class

    def list_view(self, request):
        """
        列表頁面
        :param request:
        :return:
        """
        return HttpResponse(‘列表頁面‘)

    def add_view(self, request):
        """
        添加頁面
        :param request:
        :return:
        """
        return HttpResponse(‘添加頁面‘)

    def edit_view(self, request):
        """
        編輯頁面
        :param request:
        :return:
        """
        return HttpResponse(‘編輯頁面‘)

    def delete_view(self, request):
        """
        刪除頁面
        :param request:
        :return:
        """
        return HttpResponse(‘刪除頁面‘)


site.register(models.Department, DepartmentHandler)
site.register(models.UserInfo, UserInfoHandler)

五、註冊URL

stark_practice/urls.py

from django.contrib import admin
from django.urls import path, re_path

from stark.service.core_func import site

urlpatterns = [
    path(‘admin/‘, admin.site.urls),
    re_path(r‘^stark/‘, site.urls),

]

strak組件（一）：動態生成URL