Django--組件--admin組件的源碼

 

一：啓動

 

當啓動Django時，會執行  setting.py  中的組件

INSTALLED_APPS = [
    'django.contrib.admin', 'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    'school.apps.SchoolConfig',
]

 

 

也就是會掃描admin組件

from django.contrib import admin

 

 

from django.contrib.admin.decorators import register
from django.contrib.admin.filters import (
    AllValuesFieldListFilter, BooleanFieldListFilter, ChoicesFieldListFilter,
    DateFieldListFilter, FieldListFilter, ListFilter, RelatedFieldListFilter,
    RelatedOnlyFieldListFilter, SimpleListFilter,
)
from django.contrib.admin.helpers import ACTION_CHECKBOX_NAME
from django.contrib.admin.options import (
    HORIZONTAL, VERTICAL, ModelAdmin, StackedInline, TabularInline,
)
from django.contrib.admin.sites import AdminSite, site from django.utils.module_loading import autodiscover_modules

__all__ = [
    "register", "ACTION_CHECKBOX_NAME", "ModelAdmin", "HORIZONTAL", "VERTICAL",
    "StackedInline", "TabularInline", "AdminSite", "site", "ListFilter",
    "SimpleListFilter", "FieldListFilter", "BooleanFieldListFilter",
    "RelatedFieldListFilter", "ChoicesFieldListFilter", "DateFieldListFilter",
    "AllValuesFieldListFilter", "RelatedOnlyFieldListFilter", "autodiscover",
]


def autodiscover(): autodiscover_modules('admin', register_to=site) #這句話就是掃描每一個組件中的admin.py文件


default_app_config = 'django.contrib.admin.apps.AdminConfig'

 

 

能夠看下from django.contrib.admin.sites import AdminSite, site

site = DefaultAdminSite()  #單例模式，共用一個對象

 

 

 

總結：

啓動Django加載admin組件

　　（1）from django.contrib.admin.sites import AdminSite, site  這裏有一個單例對象

　　　　　　　　site = DefaultAdminSite()

　　（2）掃描每一個組件下的admin.py　　　

　　　　autodiscover_modules('admin', register_to=site)

二：註冊

 掃描admin.py文件

 

from django.contrib import admin


class PublishConfig(admin.ModelAdmin):
    list_display = ['name']

admin.site.register(Publish,PublishConfig)  #admin.site就是那個單例模式，因此這些都是公用一個對象
admin.site.register(Author)