# Application definition

INSTALLED_APPS = [
 'django.contrib.admin',
 'django.contrib.auth',
 'django.contrib.contenttypes',
 'django.contrib.sessions',
 'django.contrib.messages',
 'django.contrib.staticfiles',
 'Xadmin.apps.XadminConfig',
 'blogs.apps.BlogsConfig',
 'bigs.apps.BigsConfig',
]

from django.contrib.admin.sites import AdminSite, site
from django.utils.module_loading import autodiscover_modules

def autodiscover():
 autodiscover_modules('admin', register_to=site)

class AdminSite(object):
 """
 An AdminSite object encapsulates an instance of the Django admin application, ready
 to be hooked in to your URLconf. Models are registered with the AdminSite using the
 register() method, and the get_urls() method can then be used to access Django view
 functions that present a full admin interface for the collection of registered
 models.
 """
 def __init__(self, name='admin'):
 self._registry = {} # model_class class -> admin_class instance
 self.name = name
 # 關于register的方法
 def register(self, model_or_iterable, admin_class=None, **options):
 if not admin_class:
  admin_class = ModelAdmin
 # Instantiate the admin class to save in the registry
 self._registry[model] = admin_class(model, self)
 #備注：截取的源碼中的一部分 

class ModelAdmin(BaseModelAdmin):
 "Encapsulates all admin options and functionality for a given model."

 list_display = ('__str__',)
 list_display_links = ()
 list_filter = ()
 list_select_related = False
 list_per_page = 100
 list_max_show_all = 200
 list_editable = ()
 search_fields = ()
 date_hierarchy = None
 save_as = False
 save_as_continue = True
 save_on_top = False
 paginator = Paginator
 preserve_filters = True
 inlines = []

 # Custom templates (designed to be over-ridden in subclasses)
 add_form_template = None
 change_form_template = None
 change_list_template = None
 delete_confirmation_template = None
 delete_selected_confirmation_template = None
 object_history_template = None
 popup_response_template = None

 # Actions
 actions = []
 action_form = helpers.ActionForm
 actions_on_top = True
 actions_on_bottom = False
 actions_selection_counter = True
 checks_class = ModelAdminChecks

 def __init__(self, model, admin_site):
 self.model = model
 self.opts = model._meta
 self.admin_site = admin_site
 super(ModelAdmin, self).__init__()

 def __str__(self):
 return "%s.%s" % (self.model._meta.app_label, self.__class__.__name__)

# 使用model代指模型類的類名
model._meta.model_name #得到字符串格式的類名（全小寫的）
model._meta.app_label #可以得到當前類所在APP的字符串的名字
# 補充
model._meta.get_field("字符串格式的字段屬性") # 得到一個字段屬性的對象field_obj，這樣我們就可以利用這個字段對象取得屬性　　　　　　　　　　　　　　　　　　　　　　　　　　　# 比如： field_obj.verbose_name 

from django.conf.urls import url

from django.contrib import admin

def get_urls_operate():
 emp = []
 emp.append(url(r'^$',查詢頁面的視圖函數(shù)))
 emp.append(url(r'^add/$',添加頁面的視圖函數(shù)))
 emp.append(url(r'^(\d+)/change/$',編輯頁面的視圖函數(shù)))
 emp.append(url(r'^(\d+)/delete/$',刪除頁面的視圖函數(shù)))
 return emp


def get_urls():
 temp = []
 for model,main_class_obj in admin.site._registry.items():
 app_name = model._meta.app_label
 model_name = model._meta.model_name
 temp.append(url(r'^{}/{}/'.format(app_name,model_name),(get_urls_operate(),None,None))) #實現(xiàn)第二層路由的分發(fā)
 return temp

urlpatterns = [
 url(r'^Xadmin/',(get_urls(),None,None)) #自定義一個前綴 實現(xiàn)第一層路由的分發(fā)
]

from django.apps import AppConfig
class BlogsConfig(AppConfig):
 name = 'blogs'

MODELS_MODULE_NAME = 'models'
class AppConfig(object):
 """
 Class representing a Django application and its configuration.
 """
 def __init__(self, app_name, app_module):
 # Full Python path to the application eg. 'django.contrib.admin'.
 self.name = app_name

 def ready(self):
 """
 Override this method in subclasses to run code when Django starts.
　　　　#這句話的語義為：在子類中重寫此方法，以便在Django啟動時運行代碼
 """

from django.apps import AppConfig
from django.utils.module_loading import autodiscover_modules
class XadminConfig(AppConfig):
 name = 'Xadmin'
 def ready(self):
  autodiscover_modules('Xadmin') #Django啟動時會自動掃描每個app下的Xadmin.py文件

from blogs import models
from Xadmin.service.Xadmin import site
site.register(models.UserInfo)
site.register(models.Book)

from django.conf.urls import url
from django.shortcuts import HttpResponse,render
class ModelXadmin(object):
 def __init__(self,model,site):
  self.model = model
  self.site = site
 def show(self,request):
  data_list = self.model.objects.all()
  return render(request,'show.html',locals()) #locals() 請函數(shù)內(nèi)部所有的鍵值對存儲 == {"data_list":data_list}
 def add(self,request):
  return HttpResponse('添加頁面')
 def edit(self,request, pk):
  return HttpResponse('編輯頁面')
 def delete(self,request, pk):
  return HttpResponse('刪除頁面')
 @property
 def get_urls_operate(self):
  emp = []
  emp.append(url(r'^$', self.show))
  emp.append(url(r'^add/$', self.add))
  emp.append(url(r'^(\d+)/change/$', self.edit))
  emp.append(url(r'^(\d+)/delete/$', self.delete))
  return emp
 @property
 def urls(self):
  return self.get_urls_operate,None,None
class XadminSite(object):
 def __init__(self,name='xadmin'):
  self._registry = {}
 def register(self,model,class_main=None,**option):
  if not class_main:
   class_main = ModelXadmin
  self._registry[model] = class_main(model,self)
 @property
 def get_urls(self):
  # print(admin.site._registry)
  temp = []
  for model, model_admin_object in self._registry.items():
   model_name = model._meta.model_name
   model_app = model._meta.app_label
   temp.append(url(r'^{}/{}/'.format(model_app, model_name), model_admin_object.urls))
  return temp
 @property
 def urls(self):
  return self.get_urls,None,None
site = XadminSite()