总路由/urls.py
from django.contrib import admin from django.urls import path,include urlpatterns = [ path('admin/', admin.site.urls), path('api/', include('api.urls')), ]
api/urls.py
from django.urls import path, re_path from api import views urlpatterns = [ path('books/', views.BookAPIView.as_view()), re_path('books/(?P<pk>d+)', views.BookAPIView.as_view()), ]
models.py
from django.db import models # Create your models here. class BaseModel(models.Model): is_delete = models.BooleanField(default=False) # auto_now_add=True 只要记录创建，不需要手动插入时间，自动把当前时间插入 create_time = models.DateTimeField(auto_now_add=True) # auto_now=True,只要更新，就会把当前时间插入 last_update_time = models.DateTimeField(auto_now=True) # import datetime # create_time=models.DateTimeField(default=datetime.datetime.now) class Meta: # 单个字段，有索引，有唯一 # 多个字段，有联合索引，联合唯一 abstract = True # 抽象表，不在数据库建立出表 class Book(BaseModel): # verbose_name admin中显示中文 name = models.CharField(max_length=32, verbose_name='书名', help_text='这里填书名') price = models.DecimalField(max_digits=8, decimal_places=2) # 一对多的关系一旦确立，关联字段写在多的一方 # to_field 默认不写，关联到Publish主键 # db_constraint=False 逻辑上的关联，实质上没有外键练习，增删不会受外键影响，但是orm查询不影响 publish = models.ForeignKey(to='Publish', on_delete=models.DO_NOTHING, db_constraint=False) # 多对多，跟作者，关联字段写在 查询次数多的一方 # 什么时候用自动，什么时候用手动？第三张表只有关联字段，用自动 第三张表有扩展字段，需要手动写 # 不能写on_delete authors = models.ManyToManyField(to='Author', db_constraint=False) class Meta: verbose_name_plural = '书表' # admin中表名的显示 def __str__(self): return self.name @property def publish_name(self): return self.publish.name # def author_list(self): def author_list(self): author_list = self.authors.all() # ll=[] # for author in author_list: # ll.append({'name':author.name,'sex':author.get_sex_display()}) # return ll return [{'name': author.name, 'sex': author.get_sex_display()} for author in author_list] class Publish(BaseModel): name = models.CharField(max_length=32) addr = models.CharField(max_length=32) def __str__(self): return self.name class Author(BaseModel): name = models.CharField(max_length=32) sex = models.IntegerField(choices=((1, '男'), (2, '女'))) # 一对一关系，写在查询频率高的一方 # OneToOneField本质就是ForeignKey+unique，自己手写也可以 authordetail = models.OneToOneField(to='AuthorDetail', db_constraint=False, on_delete=models.CASCADE) class AuthorDetail(BaseModel): mobile = models.CharField(max_length=11) # 二、表断关联 # 1、表之间没有外键关联，但是有外键逻辑关联(有充当外键的字段) # 2、断关联后不会影响数据库查询效率，但是会极大提高数据库增删改效率（不影响增删改查操作） # 3、断关联一定要通过逻辑保证表之间数据的安全，不要出现脏数据，代码控制 # 4、断关联 # 5、级联关系 # 作者没了，详情也没：on_delete=models.CASCADE # 出版社没了，书还是那个出版社出版：on_delete=models.DO_NOTHING # 部门没了，员工没有部门(空不能)：null=True, on_delete=models.SET_NULL # 部门没了，员工进入默认部门(默认值)：default=0, on_delete=models.SET_DEFAULT
ser.py
from rest_framework import serializers from api import models # 写一个类，继ListSerializer,重写update class BookListSerializer(serializers.ListSerializer): # def create(self, validated_data): # print(validated_data) # return super().create(validated_data) def update(self, instance, validated_data): print(instance,type(instance[0])) print(validated_data) """ [<Book: 物联网>, <Book: 武庚纪>] <class 'api.models.Book'> [
{'name': '物联网', 'price': Decimal('66.00'), 'authors': [<Author: Author object (1)>, <Author: Author object (2)>], 'publish': <Publish: 南京出版社>},
{'name': '武庚纪', 'price': Decimal('23.00'), 'authors': [<Author: Author object (1)>], 'publish': <Publish: 东郊出版社>}
] """ # 保存数据 # self.child:是BookModelSerializer对象 # ll=[] # for i,si_data in enumerate(validated_data): # ret=self.child.update(instance[i],si_data) # ll.append(ret) # return ll return [ # self.child.update(对象，字典) for attrs in validated_data self.child.update(instance[i], attrs) for i, attrs in enumerate(validated_data) ] # 如果序列化的是数据库的表，尽量用ModelSerializer class BookModelSerializer(serializers.ModelSerializer): # publish,显示出版社名称 # 一种方案（只序列化可以，反序列化有问题） # publish=serializers.CharField(source='publish.name') # 第二种方案，models中写方法（看models.py） class Meta: list_serializer_class = BookListSerializer model = models.Book # fields='__all__' # 用的少 # depth=0 fields = ('id', 'name', 'price', 'authors', 'publish', 'publish_name', 'author_list') extra_kwargs = { 'publish': {'write_only': True}, 'publish_name': {'read_only': True}, 'authors': {'write_only': True}, 'author_list': {'read_only': True} }
views.py
from django.shortcuts import render # Create your views here. from rest_framework.response import Response from api import models from rest_framework.views import APIView from rest_framework.generics import GenericAPIView from api.ser import BookModelSerializer class BookAPIView(APIView): def get(self,request,*args,**kwargs): #查询单个和查询所有，合到一起 if not kwargs: # 查所有 book_list=models.Book.objects.all().filter(is_delete=False) book_list_ser=BookModelSerializer(book_list,many=True) return Response(data=book_list_ser.data) #查一个 book_list = models.Book.objects.filter(pk=kwargs.get('pk')).first() book_list_ser = BookModelSerializer(book_list) return Response(data=book_list_ser.data) def post(self, request, *args, **kwargs): # 具备增单条，和增多条的功能 if isinstance(request.data, dict): book_ser = BookModelSerializer(data=request.data) book_ser.is_valid(raise_exception=True) book_ser.save() return Response(data=book_ser.data) elif isinstance(request.data, list): # 现在book_ser是ListSerializer对象 from rest_framework.serializers import ListSerializer book_ser = BookModelSerializer(data=request.data, many=True) # 增多条 print('--------', type(book_ser)) book_ser.is_valid(raise_exception=True) book_ser.save() # 新增---》ListSerializer--》create方法 # def create(self, validated_data): # self.child是BookModelSerializer对象 # print(type(self.child)) # return [ # self.child.create(attrs) for attrs in validated_data # ] return Response(data=book_ser.data) def put(self, request, *args, **kwargs): # 改一个，改多个 # 改一个 if kwargs.get('pk', None): book = models.Book.objects.filter(pk=kwargs.get('pk')).first() book_ser = BookModelSerializer(instance=book, data=request.data, partial=True) # 增多条 # partial=True # partial 表示是否可以部分修改 book_ser.is_valid(raise_exception=True) book_ser.save() return Response(data=book_ser.data) else: # 改多个, # 前端传递数据格式[{id:1,name:xx,price:xx},{id:1,name:xx,price:xx}] # 处理传入的数据 对象列表[book1，book2] 修改的数据列表[{name:xx,price:xx},{name:xx,price:xx}] book_list = [] modify_data = [] for item in request.data: # {id:1,name:xx,price:xx} pk = item.pop('id') book = models.Book.objects.get(pk=pk) book_list.append(book) modify_data.append(item) # 第一种方案，for循环一个一个修改 # 把这个实现 # for i,si_data in enumerate(modify_data): # book_ser = BookModelSerializer(instance=book_list[i], data=si_data) # book_ser.is_valid(raise_exception=True) # book_ser.save() # return Response(data='成功') # 第二种方案，重写ListSerializer的update方法 book_ser = BookModelSerializer(instance=book_list, data=modify_data, many=True) book_ser.is_valid(raise_exception=True) book_ser.save() # ListSerializer的update方法,自己写的update方法 return Response(book_ser.data) # request.data # # book_ser=BookModelSerializer(data=request.data) def delete(self, request, *args, **kwargs): # 单个删除和批量删除 pk = kwargs.get('pk') pks = [] if pk: # 单条删除 pks.append(pk) # 不管单条删除还是多条删除，都用多条删除 # 多条删除 # {'pks':[1,2,3]} else: pks = request.data.get('pks') # 把is_delete设置成true # ret返回受影响的行数 ret = models.Book.objects.filter(pk__in=pks, is_delete=False).update(is_delete=True) if ret: return Response(data={'msg': '删除成功'}) else: return Response(data={'msg': '没有要删除的数据'})