day84-仿照admin实现一个自定义的增删改查组件

一、admin的使用

　　

   app01的admin.py文件：
	     
		 class BookConfig(admin.ModelAdmin):
		       list_display=[]
		       list_display_links=[]
			   list_filter=[]
			   search_fields=[]
			   
			   def patch(self,request,queryset):
			       pass
			   patch.short_desc=""
			   actions=[patch,]
			       
			   
		 admin.site.register(Book,BookConfig)

　　

二、admin的源码分析

　　1.启动　

加载settings中的install_apps
from django.contrib import admin
autodiscover_modules('admin')

　　2.注册

　　

 源码：django.contrib.admin.sites模块
	    class AdminSite(object):
			  
			      def __init__(self):
						self._registry = {} 
			  
			      def register(self,model,admin_class=None):
				       # 设置配置类
				       if not admin_class:
							admin_class = ModelAdmin
							
					   self._registry[model] = admin_class(model, self)		
			  
			  
		site = AdminSite()
		
		每一个app下的admin.py文件：
            from django.contrib import admin
		    admin.site.register(Book,BookConfig)
		    admin.site.register(Publish)

　　

　　3.设计urls

1 知识点
			  1 url(r"index/",views.index)
			  2 url方法的分发
			  
			    # 分发
				url(r"test/",([
						url(r"yuan/",([
								 url(r"aaa/",aaa),
								 url(r"bbb/",bbb),
								 url(r"ccc/",ccc),
									  ],None,None)),


						url(r"alex/",alex),
							 ],None,None))
			    针对Food表，url：
				http://127.0.0.1:8000/admin/app02/food/
				http://127.0.0.1:8000/admin/app02/food/add/
				http://127.0.0.1:8000/admin/app02/food/1/change/
				http://127.0.0.1:8000/admin/app02/food/2/delete/
				  
			  3 
			    model._meta.model_name ：模型表的名称
			    model._meta.app_label  ：模型表所在app的名称
				
		config_obj：某个model的配置类（自定义配置类或者默认配置类）对象	  

　

三、仿照admin实现一个自定义的增删改查组件

 　　1.随之django的启动，而注册模型

　　

#app01/apps.py

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


class App01Config(AppConfig):
    name = 'app01'

    def ready(self):
        autodiscover_modules('stark')

　　2. 注册

　

# app01/stark.py

from stark.service.sites import site, ModelStark
from app01 import models

print('app01................')


class BookStark(ModelStark):
    list_display = ['title', 'price', 'publishDate','publisher']


site.register(models.Book, BookStark)

site.register(models.Publish)

　　3 . 默认配置类ModelStark和全局组件类AdminSite

# stark/service/sites.py

from django.conf.urls import url
from django.shortcuts import HttpResponse, render


class ModelStark(object):
    list_display = ["__str__"]

    def __init__(self, model):
        self.model = model

    def list_view(self, request):
        header_list = []
        for field in self.list_display:
            field_obj = self.model._meta.get_field(field)
            header_list.append(field_obj.verbose_name)
        print(header_list)

        new_data_list = []
        obj_list = self.model.objects.all()
        for obj in obj_list:
            temp = []
            for field in self.list_display:
                val = getattr(obj, field)
                temp.append(val)
            new_data_list.append(temp)
        return render(request, 'list_view.html', locals())

    def add_view(self, request):
        return HttpResponse('add_view')

    def change_view(self, request, pk):
        return HttpResponse('change_view')

    def del_view(self, request, pk):
        return HttpResponse('del_view')

    def get_urls(self):
        tmp = []
        tmp.append(url(r'^$', self.list_view))
        tmp.append(url(r'add/$', self.add_view))
        tmp.append(url(r'(\d+)/delete/$', self.del_view))
        tmp.append(url(r'(\d+)/change/$', self.change_view))
        return tmp, None, None

    @property
    def urls(self):
        return self.get_urls()


class AdminSite(object):
    def __init__(self):
        self._registy = {}

    def register(self, model, stark_class=None):
        if not stark_class:
            stark_class = ModelStark

        self._registy[model] = stark_class(model)

    def get_urls(self):
        tmp = []
        for model, config_obj in self._registy.items():
            tmp.append(url(r"{}/{}/".format(model._meta.app_label, model._meta.model_name), config_obj.urls))
        return tmp, None, None

    @property
    def urls(self):
        return self.get_urls()


site = AdminSite()