仿照admin实现一个自定义的增删改查的组件

1、首先，创建三个项目，app01，app02，stark，在settings里边记得配置。然后举例：在app01的model里边写表，用的db.sqlite3,所以数据库不用再settings里边配置。

from django.db import models

# Create your models here.

class Author(models.Model):
    nid = models.AutoField(primary_key=True)
    name = models.CharField(max_length=32)
    age = models.IntegerField()

    # 与AuthorDetail建立一对一的关系
    authorDetail=models.OneToOneField(to="AuthorDetail", on_delete=models.CASCADE)

    def __str__(self):
        return self.name

class AuthorDetail(models.Model):

    nid = models.AutoField(primary_key=True)
    birthday = models.DateField()
    telephone = models.BigIntegerField()
    addr = models.CharField(max_length=64)

class Publish(models.Model):
    nid = models.AutoField(primary_key=True)
    name = models.CharField(max_length=32)
    city = models.CharField(max_length=32)
    email = models.EmailField()

    def __str__(self):
        return self.name

class Book(models.Model):

    nid = models.AutoField(primary_key=True)
    title = models.CharField(max_length=32)
    publishDate = models.DateField()
    price = models.DecimalField(max_digits=5, decimal_places=2)

    # 与Publish建立一对多的关系,外键字段建立在多的一方
    publish=models.ForeignKey(to="Publish",to_field="nid", on_delete=models.CASCADE)
    # 与Author表建立多对多的关系,ManyToManyField可以建在两个模型中的任意一个，自动创建第三张表
    authors=models.ManyToManyField(to='Author',)

    def __str__(self):
        return self.title

2、启动：类似于admin

在stark文件夹下的apps里边写：

from django.apps import AppConfig
# 经源码分析，admin就是这样先导入这个
from django.utils.module_loading import autodiscover_modules

class StarkConfig(AppConfig):
    name = 'stark'

    def ready(self):
        autodiscover_modules("stark")

这是因为，程序一启动，先执行settings.py中的install_apps里边的模块。具体步骤详看有道云笔记。

3、注册以及url的设计

首先在stark的下边创建一个service包，创建一个sites.py，

里边放全局类以及默认配置类

from django.conf.urls import url
from django.shortcuts import HttpResponse, render, redirect

class ModelStark(object):
    """
    默认配置类
    """
    list_display = []

    def __init__(self, model):
        self.model = model

    def listview(self, request):
        print(self)  # 当前访问模型表的配置类对象
     print(self.model)  # 当前访问模型表
        data_list = self.model.objects.all()
        print(self.list_display)
        return render(request, "list_view.html", {"data_list": data_list})

    def addview(self, request):
        return HttpResponse("addview")

    def changeview(self, request, id):
        return HttpResponse("changeview")

    def delview(self, request, id):
        return HttpResponse("delview")

    def get_urls(self):
        temp = [
            url(r"^$", self.listview),
            url(r"add/$", self.addview),
            url(r"(\d+)/change/$", self.changeview),
            url(r"(\d+)/delete/$", self.delview),

        ]
        return temp

    @property
    def urls(self):
        return self.get_urls(), None, None

class AdminSite(object):
    """
        stark组件的全局类
    """

    def __init__(self):
        self._registry = {}

    def register(self, model, admin_class=None):
        # 设置配置类
        if not admin_class:
            admin_class = ModelStark
        self._registry[model] = admin_class(model)

    def get_urls(self):
        temp = []
        for model, config_obj in self._registry.items():
            model_name = model._meta.model_name
            app_label = model._meta.app_label
            temp.append(url(r"%s/%s/" % (app_label, model_name), config_obj.urls))
            # config_obj 获取的就是每个for循环中的BookConfig(Book)，publish，author遍历的对象
            '''
                      temp=[

                          #(1) url(r"app01/book/",BookConfig(Book).urls)
                          #(2) url(r"app01/book/",(BookConfig(Book).get_urls(), None, None))
                          #(3) url(r"app01/book/",([
                                                          url(r"^$", BookConfig(Book).listview),
                                                          url(r"add/$", BookConfig(Book).addview),
                                                          url(r"(\d+)/change/$", BookConfig(Book).changeview),
                                                          url(r"(\d+)/delete/$", BookConfig(Book).delview),
                                                   ], None, None))

                          ###########

                          # url(r"app01/publish/",([
                                                          url(r"^$", ModelStark(Publish).listview),
                                                          url(r"add/$",  ModelStark(Publish).addview),
                                                          url(r"(\d+)/change/$",  ModelStark(Publish).changeview),
                                                          url(r"(\d+)/delete/$",  ModelStark(Publish).delview),
                                                   ], None, None))
                      ]
                      '''

        return temp

    @property
    def urls(self):
        return self.get_urls(), None, None

site = AdminSite()