admin
1、启动开发服务器,然后在浏览器中访问 http://127.0.0.1:8000/admin/,得到登陆界面,你可以通过命令 python manage.py createsuperuser 来创建超级用户。
2、admin.py(app01有4张表,app02有1张表)
from django.contrib import admin from .models import * class BookConfig(admin.ModelAdmin): list_display=["id","user","room","date","time_id"] # 默认是__str__,不能放多对多字段 list_filter=["user","room","date"] # 页面右边会出现一个小框,刷选相关 list_display_links=["user"] # 点击进去可以编辑 list_editable=["room"] # 可以直接在查看页面编辑,可以和 links里面的重复 #date_hierarchy = "date" #fields=["user","room"] #exclude=["user","room"] ordering=["date","time_id"] # ordering,列表时,数据排序规则 search_fields=["user","tel",] # 模糊查找 # 定制Action行为具体方法 def func(self, request, queryset): print(self, request, queryset) print(request.POST.getlist('_selected_action')) queryset.update(date="2012-12-12") func.short_description = "批量初始化操作" # func.short_description = "中文显示自定义Actions" actions = [func, ] admin.site.register(Book,BookConfig) # 如果无BookConfig,默认走ModelAdmin # print("11111111111111111111",admin.site._registry) admin.site.register(UserInfo,UserConfig) admin.site.register(Room) admin.site.register(GF) # print("2222222222222",admin.site._registry)
admin.site._registry print具体内容!!!!!!!!
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1 a1 ={<class 'django.contrib.auth.models.Group'>: <django.contrib.auth.admin.GroupAdmin object at 0x000001D31F9CDCC0>, 2 <class 'app01.models.Book'>: <app01.admin.BookConfig object at 0x000001D31F9FC9E8>} 3 a2= {<class 'django.contrib.auth.models.Group'>: <django.contrib.auth.admin.GroupAdmin object at 0x000001D31F9CDCC0>, 4 <class 'app01.models.Book'>: <app01.admin.BookConfig object at 0x000001D31F9FC9E8>, 5 <class 'app01.models.UserInfo'>: <app01.admin.UserConfig object at 0x000001D31FA0C588>, 6 <class 'app01.models.Room'>: <django.contrib.admin.options.ModelAdmin object at 0x000001D31FA0C470>, 7 <class 'app01.models.GF'>: <django.contrib.admin.options.ModelAdmin object at 0x000001D31FA0C5C0>} 8 9 a12= {<class 'django.contrib.auth.models.Group'>: <django.contrib.auth.admin.GroupAdmin object at 0x000001D31F9CDCC0>, 10 <class 'app01.models.Book'>: <app01.admin.BookConfig object at 0x000001D31F9FC9E8>, 11 <class 'app01.models.UserInfo'>: <app01.admin.UserConfig object at 0x000001D31FA0C588>, 12 <class 'app01.models.Room'>: <django.contrib.admin.options.ModelAdmin object at 0x000001D31FA0C470>, 13 <class 'app01.models.GF'>: <django.contrib.admin.options.ModelAdmin object at 0x000001D31FA0C5C0>, 14 <class 'app02.models.Book'>: <django.contrib.admin.options.ModelAdmin object at 0x000001D31FA0C860>}
admin源码解析
1、单例模式
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单例模式(Singleton Pattern)是一种常用的软件设计模式,该模式的主要目的是确保某一个类只有一个实例存在。当你希望在整个系统中,某个类只能出现一个实例时,单例对象就能派上用场。
比如,某个服务器程序的配置信息存放在一个文件中,客户端通过一个 AppConfig 的类来读取配置文件的信息。如果在程序运行期间,有很多地方都需要使用配置文件的内容,也就是说,很多地方都需要创建 AppConfig 对象的实例,这就导致系统中存在多个 AppConfig 的实例对象,而这样会严重浪费内存资源,尤其是在配置文件内容很多的情况下。事实上,类似 AppConfig 这样的类,我们希望在程序运行期间只存在一个实例对象
在 Python 中,我们可以用多种方法来实现单例模式:
- 使用模块
- 使用
__new__
- 使用装饰器(decorator)
- 使用元类(metaclass)
1.1、__new__
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1 class Singleton(object): 2 _instance = None 3 def __new__(cls, *args, **kw): 4 if not cls._instance: 5 cls._instance = super(Singleton, cls).__new__(cls, *args, **kw) 6 return cls._instance 7 8 class MyClass(Singleton): 9 a = 1 10 11 12 one = MyClass() 13 # print(one.a) # 1 14 one.a=3 15 # print(one.a) # 3 16 17 two = MyClass() 18 print(two.a) # 3 19 20 print(one==two) # True 21 print(id(one),id(two)) # 2663784027136 2663784027136
1.2、模块(Python 的模块就是天然的单例模式)
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# mysingleton.py class My_Singleton(object): x =12 def foo(self): print(self.x) my_singleton = My_Singleton() print(id(my_singleton)) print("OK")
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from mysingleton import my_singleton def foo(): print(id(my_singleton))
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from mysingleton import my_singleton print(id(my_singleton)) from mysingleton import my_singleton print(id(my_singleton)) from func import * foo() """ 1852889535264 OK 1852889535264 1852889535264 1852889535264 """ print("其他情况,不同引入") from mysingleton import My_Singleton a=My_Singleton() b=My_Singleton() print(id(a)) print(id(b)) """ 1832133040112 1832133039216 """
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for model,admin_class_obj in admin.site._registry.items(): print("model",model) # 所有的注册模型表 # < class 'app01.models.Book'>-----> "book" "app01" # < class 'app01.models.Room'>-----> "room" "app01" # print("===>",model._meta.model_name) # print("===>",model._meta.app_label) model_name=model._meta.model_name app_label=model._meta.app_label temp.append(url( r"%s/%s/"%(app_label,model_name) , ( get_urls2() ,None ,None ) ) ) print(temp) """ temp= [<RegexURLResolver <RegexURLPattern list> (None:None) auth/group/>, <RegexURLResolver <RegexURLPattern list> (None:None) app01/book/>, <RegexURLResolver <RegexURLPattern list> (None:None) app01/userinfo/>, <RegexURLResolver <RegexURLPattern list> (None:None) app01/room/>, <RegexURLResolver <RegexURLPattern list> (None:None) app01/gf/>, <RegexURLResolver <RegexURLPattern list> (None:None) app02/book/>] """ return temp
2、注册 admin.py admin.site.register(Book,BookConfig)
class AdminSite(): def __init__(self, name='admin'): self._registry = {} def register(self,model,admin_class): if not admin_class: admin_class = ModelAdmin self._registry[model] = admin_class(model, self) site=AdminSite()
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app0102= {<class 'django.contrib.auth.models.Group'>: <django.contrib.auth.admin.GroupAdmin object at 0x000001D31F9CDCC0>, <class 'app01.models.Book'>: <app01.admin.BookConfig object at 0x000001D31F9FC9E8>, <class 'app01.models.UserInfo'>: <app01.admin.UserConfig object at 0x000001D31FA0C588>, <class 'app01.models.Room'>: <django.contrib.admin.options.ModelAdmin object at 0x000001D31FA0C470>, <class 'app01.models.GF'>: <django.contrib.admin.options.ModelAdmin object at 0x000001D31FA0C5C0>, <class 'app02.models.Book'>: <django.contrib.admin.options.ModelAdmin object at 0x000001D31FA0C860>}
model._meta.model_name ---> 表名
model._meta.app_label ---> app名字
3、URL
3.1 基本使用
urlpatterns = [ url(r'^admin/', admin.site.urls), url(r'^index/', views.index), url(r"^yuan/",([ ],None,None)), # 注意形式,本质!!! ]
路由分发
url(r"^yuan/", ([ url(r'^test01/', ([ url(r'^test04/', test04), url(r'^test05/', test05), ], None, None)), url(r'^test02/', test02), url(r'^test03/', test03), ], None, None) )
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urlpatterns=[ url(r"^yuan/",([ url(r"^test01/",test01") ],None,None,)) ] yuan/test01/ 如果有^ yuan后面必须是test01 ,没有^,只要后面是test01就可以。
mark
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def add(request): return HttpResponse("add") def delete(request,id): return HttpResponse("delete") def change(request,id): return HttpResponse("change") def list_view(request): return HttpResponse("list_view") def get_urls2(): temp=[] temp.append(url(r"^add/",add)) temp.append(url(r"^(\d+)/delete/",delete)) temp.append(url(r"^(\d+)/change/",change)) temp.append(url(r"^$",list_view)) return temp def get_urls(): temp=[] print("_registry",admin.site._registry) for model,admin_class_obj in admin.site._registry.items(): print("model",model) # 所有的注册模型表 # < class 'app01.models.Book'>-----> "book" "app01" # < class 'app01.models.Room'>-----> "room" "app01" # print("===>",model._meta.model_name) # print("===>",model._meta.app_label) model_name=model._meta.model_name app_label=model._meta.app_label temp.append(url(r"%s/%s/"%(app_label,model_name),(get_urls2(),None,None))) return temp urlpatterns = [ url(r'^admin/', admin.site.urls), url(r'^index/', views.index), url(r'^login/', views.login), url(r'^book/', views.book), url(r"^yuan/",(get_urls(),None,None)) ]
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