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！！！！！！！！

a1 ={<class 'django.contrib.auth.models.Group'>: <django.contrib.auth.admin.GroupAdmin object at 0x000001D31F9CDCC0>,
    <class 'app01.models.Book'>: <app01.admin.BookConfig object at 0x000001D31F9FC9E8>}
a2= {<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>}

a12= {<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>}

　　　　　　admin源码解析

1、单例模式

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__

class Singleton(object):
    _instance = None
    def __new__(cls, *args, **kw):
        if not cls._instance:
            cls._instance = super(Singleton, cls).__new__(cls, *args, **kw)
        return cls._instance

class MyClass(Singleton):
    a = 1


one = MyClass()
# print(one.a)                   #   1  
one.a=3
# print(one.a)                   #  3

two = MyClass()
print(two.a)                      #   3  

print(one==two)                #  True
print(id(one),id(two))           #  2663784027136 2663784027136

1.2、模块（Python 的模块就是天然的单例模式）

#   mysingleton.py
class My_Singleton(object):
    x =12
    def foo(self):
        print(self.x)


my_singleton = My_Singleton()
print(id(my_singleton))

print("OK")

from mysingleton import my_singleton

def foo():

    print(id(my_singleton))

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
"""

    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()

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)
        )

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

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))


]

http://www.cnblogs.com/yuanchenqi/articles/8323452.html#_label0