from django.shortcuts import render, HttpResponse# Create your views here.
from django.views import View
from app01 import models
import json
class BookListView(View):"""使用json进行json序列化"""def get(self, request):"""以json形式返回书籍的列表"""# 1. 获取所有的书籍对象# models.Book.objects.all() queryset 类型的对象，不能直接jsonqueryset = models.Book.objects.all().values('id', 'title', )# 2. 将数据序列化成json格式   date类型的数据不能直接系列化 ensure_ascii=False 修改乱码的现象ret = json.dumps(list(queryset), ensure_ascii=False)# 3. 返回return HttpResponse(ret)

from django.http.response import JsonResponseclass BookListView(View):"""使用JsonResponse进行json序列化"""def get(self, request):"""以json形式返回书籍的列表"""# 1. 获取所有的书籍对象queryset = models.Book.objects.all()　　　　 ret = []for book in queryset:tmp = {}tmp['id'] = book.pktmp['title'] = book.titletmp['pub_date'] = book.pub_date # 时间类型的有问题，这里没有修改tmp['publisher'] = book.publisher_idtmp['authors'] = [i.pk for i in book.authors.all()]ret.append(tmp)print(ret)return JsonResponse(list(queryset), safe=False, json_dumps_params={'ensure_ascii': False})

from django.core import serializers
class BookListView(View):"""使用django内置的进行json序列化"""def get(self, request):"""以json形式返回书籍的列表"""# 1. 获取所有的书籍对象queryset = models.Book.objects.all()# 2. 将数据序列化成json格式data = serializers.serialize('json', queryset=queryset)# 3. 返回return HttpResponse(data)

class BookSerializer(serializers.Serializer):id = serializers.IntegerField(required=False)title = serializers.CharField()pub_date = serializers.DateField()#python -m pip install djangorestframework
# 在setting.py中 将rest_framework 写下 INSTALLED_APPS列表中
from rest_framework.views import APIView
from rest_framework.response import Responseclass BookListView(APIView):"""使用djangorestful进行json序列化"""def get(self, request):"""以json形式返回书籍的列表"""# 1. 获取所有的书籍对象queryset = models.Book.objects.all()# 2. 将数据序列化成json格式，many=True将数据一个一个的循环ser_obj = BookSerializer(queryset, many=True)# 3. 返回return Response(ser_obj.data)

class BookModelSerializer(serializers.ModelSerializer):# 自定义数据库不存在的字段category_info = serializers.SerializerMethodField()  # 找  get_字段名的方法 执行publisher_info = serializers.SerializerMethodField()author_info = serializers.SerializerMethodField()def get_category_info(self, obj):return obj.get_category_display()def get_publisher_info(self, obj):ser_obj = PublisherSerializer(obj.publisher)return ser_obj.datadef get_author_info(self, obj):ser_obj = AuthorSerializer(obj.authors.all(),many=True)return ser_obj.dataclass Meta:model = models.Bookfields = '__all__'# depth = 1  # 跟对象关联的内容   属性read_only = True# exclude = [] #排除那些字段# exclude fields 不能同时存在# 自定义的字段extra_kwargs = {'category': {'write_only': True},'publisher': {'write_only': True},'authors': {'write_only': True},}

class BookView(APIView):   def get(self, request, pk):      """获取一本书的详情"""      # 1. 根据PK获取一本书的对象      book_obj = models.Book.objects.filter(pk=pk).first()      if book_obj:         # 2. 对书的对象进行json序列化         # ser_obj = BookSerializer(book_obj)         ser_obj = BookModelSerializer(book_obj)         # 3. 返回json数据         return Response(ser_obj.data)      else:         return Response({'error': '查无此书'})

   def put(self, request, pk):      """修改一本书"""      # 1. 获取书籍对象      book_obj = models.Book.objects.filter(pk=pk).first()

      # 2. 使用序列化器对数据进行校验 保存      # partial=True 修改局部的信息，不加需要提交所有的信息      ser_obj = BookModelSerializer(data=request.data, instance=book_obj, partial=True)      if ser_obj.is_valid():         ser_obj.save()         # 3. 返回修改后的对象的json数据         return Response(ser_obj.data)      else:         return Response(ser_obj.errors)

   def delete(self, request, pk):      """删除一本书"""      # 1. 获取书籍对象      book_obj = models.Book.objects.filter(pk=pk).first()      if book_obj:         # 2. 删除         book_obj.delete()         # 3. 返回json数据         return Response({'msg': '删除成功'})      else:         return Response({'error': '查无此书'})