知识一:admin之路由分发原理:
def text01(request):return  HttpResponse('text01')
def text02(request):return  HttpResponse('text02')
def text03(request):return  HttpResponse('text03')
urlpatterns = [path('chen/',([path('text01/',text01),path('text02/',text02),path('text03/',text03),],None,None))
]由一个路由分发出来三个 第一个none是namespace,第二个是项目名称一级:path('chen/',([path()path()path()],None,None))由一个路由分发出来三个,第一个路由又可以分发出来两个,二级路由.第一个none是namespace,第二个是项目名称二级:path('chen/',([path([path(),path(),],None,None))],None,None))

        __new__class Singleton(object):_instance = Nonedef __new__(cls, *args, **kwargs):# 第一次生成对象的时候走:if not cls._instance:cls._instance = super(Singleton, cls).__new__(cls, *args, **kwargs) # 第二次走的时候直接走这里return cls._instance
class MyClass(Singleton):  a = 1#那么每次实例对象的时候都是指向 同一个内存地址.
#实例MyClass的时候都是 同一个对象

class StarkSite(object):"""注册model对应的配置类(MondelStark或用户自定制)"""def __init__(self):self._registry={}#self--->site单例对象def register(self,model,stark_class=None):if not stark_class:stark_class=MondelStarkself._registry[model] = stark_class(model,self)def get_urls(self):# self--->site单例对象temp=[]for model,stark_class_obj in self._registry.items():model_name=model._meta.model_nameapp_label =model._meta.app_labeltemp.append(path('%s/%s/'%(app_label,model_name),stark_class_obj.get_url_dispath))'''path('repository/book/'BookStark(book,).get_url_dispath)path('repository/author/'BookStark(author,).get_url_dispath)'''return temp@propertydef urls(self):return self.get_urls(),None,Nonesite=StarkSite()

#单例的类
class StarkSite(object):"""注册model对应的配置类(MondelStark或用户自定制)"""def __init__(self):self._registry={}#self--->site单例对象def register(self,model,stark_class=None):if not stark_class:stark_class=MondelStarkself._registry[model] = stark_class(model,self)def get_urls(self):# self--->site单例对象temp=[]for model,stark_class_obj in self._registry.items():model_name=model._meta.model_nameapp_label =model._meta.app_labeltemp.append(path('%s/%s/'%(app_label,model_name),stark_class_obj.get_url_dispath))'''path('repository/book/'BookStark(book,).get_url_dispath)path('repository/author/'BookStark(author,).get_url_dispath)'''return temp@propertydef urls(self):return self.get_urls(),None,None

from repository import models
from stark.server.stark import site
from stark.server.stark import MondelStark

#我们需要在stark项目的app里:
from django.apps import AppConfig
from django.utils.module_loading import autodiscover_modulesclass StarkConfig(AppConfig):name = 'stark'def ready(self):autodiscover_modules('stark',)#每次启动都会执行每个项目的stark.py文件,那么一开启项目就把model注册了.###########其他项目注册model##########
site.register(models.Book,BookStark)site.register(models.Author,AuthorStark)site.register(models.publish)

from stark.server.stark import MondelStarkclass BookStark(MondelStark):
pass

 for model,class_obj in admin.site._registry.items():print(model._meta.model_name) #打印出该模型的名称print(model._meta.app_label)  #打印出该模型的app的名称

    def url_dispath(self):# self--->stark_class_obj--->每一个单独的配置类.temp = []model_name = self.model._meta.model_nameapp_label = self.model._meta.app_labeltemp.extend([path('add/', self.add_view,name="%s_%s_add"%(app_label,model_name)),re_path('^(\d+)/delete/', self.delete_view,name="%s_%s_delete"%(app_label,model_name)),re_path('^(\d+)/change/', self.change_view,name="%s_%s_change"%(app_label,model_name)),path('', self.show_list,name="%s_%s_list"%(app_label,model_name))])return temp#起别名,目的是为了反向查询的时候能够查到相对应的url

    ###################
    反射:class B(object):def__init__(self,name):self.name=namechen=B('chenxuming')s='name'ret=getattr(chen,s)print(ret)  ---->'chenxuming'

class Book(models.Model):name = models.CharField(max_length=64,verbose_name='书名')price= models.IntegerField()name=Book._meta.get_field('name')#name拿到的是title字段的对象print(name)print(type(name))#可以取里面的属性name.max_length  --->64name.verbose_name--->'书名'

    def new_list_display(self):''''构建初始化列表的字段''   temp=[]temp.append(MondelStark.checkbox)temp.extend(self.list_display)temp.append(MondelStark.get_delete_msg)if not self.list_display_links:temp.append(MondelStark.get_edit_msg)return tempdef get_headers(self):# 构建表头:      self.new_list_display=[checkbox,'name','price',delete,edit]header_list = []for field in  self.config.new_list_display:if callable(field):val = field(self.config, header=True)header_list.append(val)else:if field == '__str__':val =  self.config.model_name.upper()header_list.append(val)else:val =  self.config.model._meta.get_field(field).verbose_nameheader_list.append(val)return header_listdef get_body(self):# 表数据的创建new_list = []for obj in self.data_list:item_list = []for item in  self.config.new_list_display:if callable(item):val = item(self.config, obj)else:val = getattr(obj, item)if item in  self.config.list_display_links:val = mark_safe('<a href="%s">%s</a>' % ( self.config.get_edit_url(obj), val))item_list.append(val)new_list.append(item_list)return new_list[[数据],[数据],[数据]]##########表头,部分表数据的函数#########def checkbox(self,obj=None,header=False):if header:return mark_safe('<input id="choice_all" type="checkbox">')return mark_safe('<input class="item" type="checkbox" name="selected_id" value="%s">'%obj.id)def get_edit_msg(self,obj=None,header=False):if header:return "操作"_url=self.get_edit_url(obj)return mark_safe('<a href="%s">编辑</a>' % _url)def get_delete_msg(self,obj=None,header=False):if header:return "操作"_url=self.get_delete_url(obj)return mark_safe('<a href="%s">删除</a>'%_url)

class BookStark(MondelStark):list_display=['id','name','price']Stark_Model_Form=ModelFormBooklist_display_links = ['name']class ModelFormBook(ModelForm):"""自定制ModelForm类"""class Meta:model=models.Bookfields='__all__'labels={'name':'书名','price':'价格','pub':'出版社','author':'作者',}def get_model_class(self):'''判断是否自定制了ModelForm'''if not self.Stark_Model_Form:from django.forms import ModelFormclass ModelDeMo(ModelForm):class Meta:model = self.modelfields = '__all__'return ModelDeMoelse:return self.Stark_Model_Formdef add_view(self,request):'''增加的视图函数'''# self--->stark_class_obj--->每一个单独的配置类.ModelDeMo=self.get_model_class()if request.method=='GET':form =ModelDeMo()return render(request, 'oprate/add.html', {'form':form})if request.method=='POST':form = ModelDeMo(request.POST)if form.is_valid():form.save()return redirect(self.get_list_url())else:return render(request,'oprate/add.html',{'form':form})###########前端#########
<form class="form-horizontal col-sm-7" method="post" novalidate>{% csrf_token %}{% for data in form  %}<label>{{ data.label }}</label>{{ data }}<div class="errors-form">{{ data.errors.0 }}</div>{% endfor %}<button type="submit" class="btn btn-success">提交</button>
</form>

    def change_view(self,request,nid):'''改 视图函数'''# self--->stark_class_obj--->每一个单独的配置类.ModelDeMo=self.get_model_class()change_obj=self.model.objects.filter(id=nid).first()if request.method=='GET':form=ModelDeMo(instance=change_obj)return render(request,'oprate/edit.html',{'form':form})if request.method=='POST':show_url = self.get_list_url()#instance=change_obj# form.save()#执行的是update操作form=ModelDeMo(data=request.POST,instance=change_obj)if form.is_valid():form.save()return redirect(show_url)else:return render(request, 'oprate/edit.html', {'form': form})###前端###<form class="form-horizontal col-sm-7" method="post" novalidate>{% csrf_token %}{% for data in form  %}<label>{{ data.label }}</label>{{ data }}<div class="errors-form">{{ data.errors.0 }}</div>{% endfor %}<button type="submit" class="btn btn-success">提交</button>
</form>

    def delete_view(self,request,nid):# 删除视图函数# self--->stark_class_obj--->每一个单独的配置类.del_obj = self.model.objects.filter(id=nid).first()show_url = self.get_list_url()if request.method=='GET':return render(request,'oprate/delete.html',{'show_url':show_url})if request.method=='POST':if del_obj:del_obj.delete()return redirect(show_url)###前端######<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><title>Title</title>
</head>
<body>
<h1>删除页面</h1>
<form action="" method="post" novalidate>{% csrf_token %}<input type="submit" value="确认删除"><a href="{{ show_url }}">取消</a>
</form></body>
</html>

from django.db.models import QQ的两种玩法:第一种:
查询字段必须是字段Book.objects.filter(Q(title='yuan')|Q(price=123))第二种
查询字段可以是字符串:#实例化一个Q对象
search_connction=Q()
#或查询默认是and
search_connction.connector='or'for search_fiile in self.search_fiile   #self.search_fiile 用户自定制的['name','price']#append里面是一个元组#search_connction.children.append((search_fiile,'查询的内容'))search_connction.children.append((search_fiile+'__contains','查询的内容'))模糊查询data_list = self.model.objects.filter(search_list)

def get_search_connection(self,request):'''获取模糊查询的Q'''self.key_word=request.GET.get('q','')search_connction=Q()if self.key_word:search_connction.connector='or'for fields in self.search_fields:search_connction.children.append((fields+'__icontains',self.key_word))return search_connctionsearch_list=self.get_search_connection(request)data_list = self.model.objects.filter(search_list)##前端##
{% if showlist.config.search_fields %}<form action="" method="get" class="pull-right"><input type="text" name="q" value="{{ showlist.config.key_word }}"><button>查询</button></form>{% endif %}