1、admin的源碼流程django
首先能夠肯定的是：路由關係必定對應一個視圖函數app
a、當點擊運行的時候，會先找到每個app中的admin.py文件，並執行函數
b、執行urls.py post
admin.site是什麼？url
admin.site,urls 返回的是一個元組，裏面的第一個元素是一個列表code
django-admin的源碼流程
咱們本身生成的動態的訪問url
====================================初級版=========================
from django.shortcuts import HttpResponse
from django.conf.urls import url
from django.contrib import admin
from app01 import views
def login(request):
return HttpResponse("ok")
url_list = []
for model_class,v in admin.site._registry.items():
print(model_class) #打印的是每個類<class 'app01.models.UserInfo'>
cls_name = model_class._meta.model_name #當前類名稱的小寫
app_name = model_class._meta.app_label #當前app的名稱
val = url(r'^{0}/{1}/$'.format(app_name,cls_name), login, name="login")
url_list.append(val)
urlpatterns = [
url(r'^admin/', admin.site.urls),
# admin.site這個對象裏面有一個屬性_registry = {}
#點擊urls查看源碼返回的是一個元組，元組的第一個元素是一個列表
url(r'^index/', ([
url(r'^app01/userinfo/$', login,name="login"),
url(r'^app01/roles/$', login,name="login"),
],None,None)),
url(r'^index2/', (url_list,None,None,)), #吧上面定義的列表拿下來，這是後就動態生成了
]
================================升級============================
路徑http://127.0.0.1:8001/index/app01/roles/後面還有增刪改查的路徑
http://127.0.0.1:8001/index/app01/roles/add/
http://127.0.0.1:8001/index/app01/roles/1/change/
http://127.0.0.1:8001/index/app01/roles/1/del/
實現流程
from django.shortcuts import HttpResponse
from django.conf.urls import url
from django.contrib import admin
from app01 import views
def login(request):
return HttpResponse("ok")
def change_list(request):
return HttpResponse("列表頁面")
def add_view(request):
return HttpResponse("添加頁面")
def change_view(request,nid):
return HttpResponse("修改頁面")
def delete_view(request,nid):
return HttpResponse("刪除頁面")
url_list = []
for model_class,v in admin.site._registry.items():
print(model_class) #打印的是每個類<class 'app01.models.UserInfo'>
cls_name = model_class._meta.model_name #當前類名稱的小寫
app_name = model_class._meta.app_label #當前app的名稱
urls_list = url(r'^{0}/{1}/$'.format(app_name,cls_name), change_list, name="login")
url_list.append(urls_list)
add_url = url(r'^{0}/{1}/add/$'.format(app_name, cls_name), add_view, name="login")
url_list.append(add_url)
change_url = url(r'^{0}/{1}/(\d+)/change/$'.format(app_name, cls_name), change_view, name="login")
url_list.append(change_url)
del_url = url(r'^{0}/{1}/(\d+)/del/$'.format(app_name, cls_name), delete_view, name="login")
url_list.append(del_url)
urlpatterns = [
url(r'^admin/', admin.site.urls),
# admin.site這個對象裏面有一個屬性_registry = {}
#點擊urls查看源碼返回的是一個元組，元組的第一個元素是一個列表
url(r'^index/', (
[
url(r'^app01/userinfo/$', login,name="login"),
url(r'^app01/roles/$', login,name="login"),
],None,None)),
url(r'^index2/', (url_list,None,None,)), #吧上面定義的列表拿下來，這是後就動態生成了
]
說明了：
url的本質：它讀取_registry全部字典裏面的數據，爲字典裏面的每個類生成了4個url
==================================修改上面的版本=============================
定義了一個
def get_urls():
temp = [
url(r'^$'.format(app_name, cls_name), change_list),
url(r'^add/$'.format(app_name, cls_name), add_view),
url(r'^del/$'.format(app_name, cls_name), delete_view),
url(r'^change/$'.format(app_name, cls_name), change_view)
]
return temp
url_list = []
for model_class,v in admin.site._registry.items():
print('-------',model_class) #打印的是每個類<class 'app01.models.UserInfo'>
cls_name = model_class._meta.model_name #當前類名稱的小寫
app_name = model_class._meta.app_label #當前app的名稱
方式一：
# all_urls = url(r'^{0}/{1}/'.format(app_name,cls_name), (get_urls(),None,None,))
方式二：
all_urls = url(r'^{0}/{1}/'.format(app_name,cls_name), include(get_urls()) )
url_list.append(all_urls)
urlpatterns = [
url(r'^admin/', admin.site.urls),
# admin.site這個對象裏面有一個屬性_registry = {}
#點擊urls查看源碼返回的是一個元組，元組的第一個元素是一個列表
url(r'^index/', (
[
url(r'^app01/userinfo/', ([
url(r'^$', change_list, name="login"),
url(r'^add/$', add_view, name="login"),
url(r'^(\d+)/del/$', delete_view, name="login"),
url(r'^(\d+)/change/$', change_view, name="login"),
],None,None),name="login"),
url(r'^app01/usertype/', ([
url(r'^$', change_list, name="login"),
url(r'^add/$', add_view, name="login"),
url(r'^(\d+)/del/$', delete_view, name="login"),
url(r'^(\d+)/change/$', change_view, name="login"),
], None, None), name="login"),],None,None)),
url(r'^app02/article/', ([
url(r'^$', change_list, name="login"),
url(r'^add/$', add_view, name="login"),
url(r'^(\d+)/del/$', delete_view, name="login"),
url(r'^(\d+)/change/$', change_view, name="login"),
],None,None),name="login"),
# index和index2的兩個是同樣的，咱們能夠用index2的方式替代index
url(r'^index2/', (url_list,None,None,)), #吧上面定義的列表拿下來，這是後就動態生成了
]
include的本質就是：返回了一個元組，元組的第一個是這個模塊
include裏面
既能夠寫一個列表include([])，利用include作分發
也能夠返回一個字符串：幫咱們去找到這個模塊，找到全部的映射關係
include(model_admin.urls)
model_admin是什麼？ModelAdmin對象的urls
總結orm
- admin源碼流程
a. 運行程序，找到每個app中的 admin.py 文件，並加載
- app01.admin.py
- 建立admin.site中的對象
- 執行對象的 register方法，目的：將註冊類添加到 _registry中
_registry = {
key是傳進來的model value:是ModelAdmin的對象，傳了兩個參數
models.Role: ModelAdmin(models.Role,admin.site),
models.UserInfo: ModelAdmin(models.UserInfo,admin.site)
models.UserType: ModelAdmin(models.UserType,admin.site)
}
- app02.admin.py
- 用app01.admin中建立那個admin.site對象
- 執行對象的 register方法，目的：講註冊類添加到 _registry中
_registry = {
models.Role: ModelAdmin(models.Role,admin.site),
models.UserInfo: ModelAdmin(models.UserInfo,admin.site)
models.UserType: ModelAdmin(models.UserType,admin.site)
models.Article: ModelAdmin(models.Article,admin.site)
}
admin.site是一個對象（單例模式建立），其中封裝了：
_registry = {
models.Role: ModelAdmin(models.Role,admin.site),
models.UserInfo: ModelAdmin(models.UserInfo,admin.site)
models.UserType: ModelAdmin(models.UserType,admin.site)
models.Article: ModelAdmin(models.Article,admin.site)
}
b. urls.py
再次調用 admin.site 對象的 urls屬性：
urlpatterns = [
url(r'^admin/', admin.site.urls),
]
class ModelAdmin(object):
def __init__(self,model_class,site):
self.model_class = model_class
self.site = site
def changelist_view(self,request):
data_list = self.model_class.objects.all() #是動態的
return HttpResponse('列表頁面')
def add_view(self,request):
return HttpResponse('添加頁面')
def delete_view(self,request,nid):
return HttpResponse('刪除頁面')
def change_view(self,request,nid):
return HttpResponse('修改頁面')
def get_urls(self):
urlpatterns = [
url(r'^$', self.changelist_view),
url(r'^add/$', self.add_view),
url(r'^(.+)/delete/$', self.delete_view),
url(r'^(.+)/change/$', self.change_view),
]
return urlpatterns
@property
def urls(self):
return self.get_urls()
class AdminSite(object):
def __init__(self):
self._registry = {}
def register(self,model_class,model_admin):
self._registry[model_class] = model_admin(model_class,self)
def get_urls(self):
"""
models.Role: ModelAdmin(models.Role,admin.site),
models.UserInfo: ModelAdmin(models.UserInfo,admin.site)
models.UserType: ModelAdmin(models.UserType,admin.site)
models.Article: ModelAdmin(models.Article,admin.site)
"""
url_list = []
for model_class,model_admin in self._registry.items():
model_class是一個類
app_name = model_class._meta.app_label
model_name = model_class._meta.model_name
url_list += [
url('%s/%s' %(app_name,model_name,), include(model_admin.urls))
]
return url_list
@property
def urls(self):
return (self.get_urls(), None,None )