Django 中 admin 的执行流程

Django 中 admin 的执行流程

1 循环加载执行所有已经注册的 app 中的 admin.py 文件

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

2 执行代码

＃admin.py

class BookAdmin(admin.ModelAdmin):
    list_display = ("title",'publishDate', 'price')

admin.site.register(Book, BookAdmin) 

admin.site.register(Publish)

3 admin.site

class AdminSite(object):

    ......

site = AdminSite()

这里应用的是一个单例模式，对于 AdminSite 类的一个单例模式，执行的每一个 app 中的每一个 admin.site 都是一个对象。

4 执行 register 方法

admin.site.register(Book, BookAdmin)
admin.site.register(Publish)

class ModelAdmin(BaseModelAdmin):pass

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)

到这里，注册结束！

5 admin 的 URL 配置

urlpatterns = [
    url(r'^admin/', admin.site.urls),
]

这里的 urls 其实是一个静态函数，能够返回一个元组，元组的第一个元素是 url 列表，剩下的两个元素是 Django 自配的，自配置时设为 None 即可。urls 函数如下。

class AdminSite(object):

     def get_urls(self):
        from django.conf.urls import url, include

        urlpatterns = []

        # Add in each model's views, and create a list of valid URLS for the
        # app_index
        valid_app_labels = []
        for model, model_admin in self._registry.items():
            urlpatterns += [
                url(r'^%s/%s/' % (model._meta.app_label, model._meta.model_name), include(model_admin.urls)),
            ]
            if model._meta.app_label not in valid_app_labels:
                valid_app_labels.append(model._meta.app_label)

        return urlpatterns

    @property
    def urls(self):
        return self.get_urls(), 'admin', self.name

6 url() 方法的扩展应用

from django.shortcuts import HttpResponse
def test01(request):
    return HttpResponse("test01")

def test02(request):
    return HttpResponse("test02")

urlpatterns = [
    url(r'^admin/', admin.site.urls),
    url(r'^yuan/', ([
                    url(r'^test01/', test01),
                    url(r'^test02/', test02),

                    ],None,None)),

]

扩展优化

from django.conf.urls import url,include
from django.contrib import admin

from django.shortcuts import HttpResponse

def change_list_view(request):
    return HttpResponse("change_list_view")
def add_view(request):
    return HttpResponse("add_view")
def delete_view(request):
    return HttpResponse("delete_view")
def change_view(request):
    return HttpResponse("change_view")

def get_urls():

    temp=[
        url(r"^$".format(app_name,model_name),change_list_view),
        url(r"^add/$".format(app_name,model_name),add_view),
        url(r"^\d+/del/$".format(app_name,model_name),delete_view),
        url(r"^\d+/change/$".format(app_name,model_name),change_view),
    ]

    return temp

url_list=[]

for model_class,obj in admin.site._registry.items():

    model_name=model_class._meta.model_name
    app_name=model_class._meta.app_label

    # temp=url(r"{0}/{1}/".format(app_name,model_name),(get_urls(),None,None))
    temp=url(r"{0}/{1}/".format(app_name,model_name),include(get_urls()))
    url_list.append(temp)

urlpatterns = [
    url(r'^admin/', admin.site.urls),
    url(r'^yuan/', (url_list,None,None)),
]

参考链接：https://www.cnblogs.com/yuanchenqi/articles/8323452.html